summaryrefslogtreecommitdiffstats
path: root/doc/html/qimage.html
blob: e2b88fd3b86e904c93bb46806c03e23f494d2daa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qimage.cpp:69 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>QImage Class</title>
<style type="text/css"><!--
fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>

<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
 <a href="index.html">
<font color="#004faf">Home</font></a>
 | <a href="classes.html">
<font color="#004faf">All&nbsp;Classes</font></a>
 | <a href="mainclasses.html">
<font color="#004faf">Main&nbsp;Classes</font></a>
 | <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
 | <a href="groups.html">
<font color="#004faf">Grouped&nbsp;Classes</font></a>
 | <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QImage Class Reference</h1>

<p>The QImage class provides a hardware-independent pixmap
representation with direct access to the pixel data.
<a href="#details">More...</a>
<p><tt>#include &lt;<a href="qimage-h.html">qimage.h</a>&gt;</tt>
<p><a href="qimage-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn>enum <a href="#Endian-enum"><b>Endian</b></a> { IgnoreEndian, BigEndian, LittleEndian }</li>
<li class=fn><a href="#QImage"><b>QImage</b></a> ()</li>
<li class=fn><a href="#QImage-2"><b>QImage</b></a> ( int&nbsp;w, int&nbsp;h, int&nbsp;depth, int&nbsp;numColors = 0, Endian&nbsp;bitOrder = IgnoreEndian )</li>
<li class=fn><a href="#QImage-3"><b>QImage</b></a> ( const&nbsp;QSize&nbsp;&amp;&nbsp;size, int&nbsp;depth, int&nbsp;numColors = 0, Endian&nbsp;bitOrder = IgnoreEndian )</li>
<li class=fn><a href="#QImage-4"><b>QImage</b></a> ( const&nbsp;QString&nbsp;&amp;&nbsp;fileName, const&nbsp;char&nbsp;*&nbsp;format = 0 )</li>
<li class=fn><a href="#QImage-5"><b>QImage</b></a> ( const&nbsp;char&nbsp;*&nbsp;const&nbsp;xpm[] )</li>
<li class=fn><a href="#QImage-6"><b>QImage</b></a> ( const&nbsp;QByteArray&nbsp;&amp;&nbsp;array )</li>
<li class=fn><a href="#QImage-7"><b>QImage</b></a> ( uchar&nbsp;*&nbsp;yourdata, int&nbsp;w, int&nbsp;h, int&nbsp;depth, QRgb&nbsp;*&nbsp;colortable, int&nbsp;numColors, Endian&nbsp;bitOrder )</li>
<li class=fn><a href="#QImage-8"><b>QImage</b></a> ( uchar&nbsp;*&nbsp;yourdata, int&nbsp;w, int&nbsp;h, int&nbsp;depth, int&nbsp;bpl, QRgb&nbsp;*&nbsp;colortable, int&nbsp;numColors, Endian&nbsp;bitOrder )</li>
<li class=fn><a href="#QImage-9"><b>QImage</b></a> ( const&nbsp;QImage&nbsp;&amp;&nbsp;image )</li>
<li class=fn><a href="#~QImage"><b>~QImage</b></a> ()</li>
<li class=fn>QImage &amp; <a href="#operator-eq"><b>operator=</b></a> ( const&nbsp;QImage&nbsp;&amp;&nbsp;image )</li>
<li class=fn>QImage &amp; <a href="#operator-eq-2"><b>operator=</b></a> ( const&nbsp;QPixmap&nbsp;&amp;&nbsp;pixmap )</li>
<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const&nbsp;QImage&nbsp;&amp;&nbsp;i ) const</li>
<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const&nbsp;QImage&nbsp;&amp;&nbsp;i ) const</li>
<li class=fn>void <a href="#detach"><b>detach</b></a> ()</li>
<li class=fn>QImage <a href="#copy"><b>copy</b></a> () const</li>
<li class=fn>QImage <a href="#copy-2"><b>copy</b></a> ( int&nbsp;x, int&nbsp;y, int&nbsp;w, int&nbsp;h, int&nbsp;conversion_flags = 0 ) const</li>
<li class=fn>QImage <a href="#copy-3"><b>copy</b></a> ( const&nbsp;QRect&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li>
<li class=fn>int <a href="#width"><b>width</b></a> () const</li>
<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
<li class=fn>QSize <a href="#size"><b>size</b></a> () const</li>
<li class=fn>QRect <a href="#rect"><b>rect</b></a> () const</li>
<li class=fn>int <a href="#depth"><b>depth</b></a> () const</li>
<li class=fn>int <a href="#numColors"><b>numColors</b></a> () const</li>
<li class=fn>Endian <a href="#bitOrder"><b>bitOrder</b></a> () const</li>
<li class=fn>QRgb <a href="#color"><b>color</b></a> ( int&nbsp;i ) const</li>
<li class=fn>void <a href="#setColor"><b>setColor</b></a> ( int&nbsp;i, QRgb&nbsp;c )</li>
<li class=fn>void <a href="#setNumColors"><b>setNumColors</b></a> ( int&nbsp;numColors )</li>
<li class=fn>bool <a href="#hasAlphaBuffer"><b>hasAlphaBuffer</b></a> () const</li>
<li class=fn>void <a href="#setAlphaBuffer"><b>setAlphaBuffer</b></a> ( bool&nbsp;enable )</li>
<li class=fn>bool <a href="#allGray"><b>allGray</b></a> () const</li>
<li class=fn>bool <a href="#isGrayscale"><b>isGrayscale</b></a> () const</li>
<li class=fn>uchar * <a href="#bits"><b>bits</b></a> () const</li>
<li class=fn>uchar * <a href="#scanLine"><b>scanLine</b></a> ( int&nbsp;i ) const</li>
<li class=fn>uchar ** <a href="#jumpTable"><b>jumpTable</b></a> () const</li>
<li class=fn>QRgb * <a href="#colorTable"><b>colorTable</b></a> () const</li>
<li class=fn>int <a href="#numBytes"><b>numBytes</b></a> () const</li>
<li class=fn>int <a href="#bytesPerLine"><b>bytesPerLine</b></a> () const</li>
<li class=fn>bool <a href="#create"><b>create</b></a> ( int&nbsp;width, int&nbsp;height, int&nbsp;depth, int&nbsp;numColors = 0, Endian&nbsp;bitOrder = IgnoreEndian )</li>
<li class=fn>bool <a href="#create-2"><b>create</b></a> ( const QSize &amp;, int&nbsp;depth, int&nbsp;numColors = 0, Endian&nbsp;bitOrder = IgnoreEndian )</li>
<li class=fn>void <a href="#reset"><b>reset</b></a> ()</li>
<li class=fn>void <a href="#fill"><b>fill</b></a> ( uint&nbsp;pixel )</li>
<li class=fn>void <a href="#invertPixels"><b>invertPixels</b></a> ( bool&nbsp;invertAlpha = TRUE )</li>
<li class=fn>QImage <a href="#convertDepth-2"><b>convertDepth</b></a> ( int&nbsp;depth ) const</li>
<li class=fn>QImage <a href="#convertDepthWithPalette"><b>convertDepthWithPalette</b></a> ( int&nbsp;d, QRgb&nbsp;*&nbsp;palette, int&nbsp;palette_count, int&nbsp;conversion_flags = 0 ) const</li>
<li class=fn>QImage <a href="#convertDepth"><b>convertDepth</b></a> ( int&nbsp;depth, int&nbsp;conversion_flags ) const</li>
<li class=fn>QImage <a href="#convertBitOrder"><b>convertBitOrder</b></a> ( Endian&nbsp;bitOrder ) const</li>
<li class=fn>enum <a href="#ScaleMode-enum"><b>ScaleMode</b></a> { ScaleFree, ScaleMin, ScaleMax }</li>
<li class=fn>QImage <a href="#smoothScale"><b>smoothScale</b></a> ( int&nbsp;w, int&nbsp;h, ScaleMode&nbsp;mode = ScaleFree ) const</li>
<li class=fn>QImage <a href="#smoothScale-2"><b>smoothScale</b></a> ( const&nbsp;QSize&nbsp;&amp;&nbsp;s, ScaleMode&nbsp;mode = ScaleFree ) const</li>
<li class=fn>QImage <a href="#scale"><b>scale</b></a> ( int&nbsp;w, int&nbsp;h, ScaleMode&nbsp;mode = ScaleFree ) const</li>
<li class=fn>QImage <a href="#scale-2"><b>scale</b></a> ( const&nbsp;QSize&nbsp;&amp;&nbsp;s, ScaleMode&nbsp;mode = ScaleFree ) const</li>
<li class=fn>QImage <a href="#scaleWidth"><b>scaleWidth</b></a> ( int&nbsp;w ) const</li>
<li class=fn>QImage <a href="#scaleHeight"><b>scaleHeight</b></a> ( int&nbsp;h ) const</li>
<li class=fn>QImage <a href="#xForm"><b>xForm</b></a> ( const&nbsp;QWMatrix&nbsp;&amp;&nbsp;matrix ) const</li>
<li class=fn>QImage <a href="#createAlphaMask"><b>createAlphaMask</b></a> ( int&nbsp;conversion_flags = 0 ) const</li>
<li class=fn>QImage <a href="#createHeuristicMask"><b>createHeuristicMask</b></a> ( bool&nbsp;clipTight = TRUE ) const</li>
<li class=fn>QImage <a href="#mirror"><b>mirror</b></a> () const</li>
<li class=fn>QImage <a href="#mirror-2"><b>mirror</b></a> ( bool&nbsp;horizontal, bool&nbsp;vertical ) const</li>
<li class=fn>QImage <a href="#swapRGB"><b>swapRGB</b></a> () const</li>
<li class=fn>bool <a href="#load"><b>load</b></a> ( const&nbsp;QString&nbsp;&amp;&nbsp;fileName, const&nbsp;char&nbsp;*&nbsp;format = 0 )</li>
<li class=fn>bool <a href="#loadFromData"><b>loadFromData</b></a> ( const&nbsp;uchar&nbsp;*&nbsp;buf, uint&nbsp;len, const&nbsp;char&nbsp;*&nbsp;format = 0 )</li>
<li class=fn>bool <a href="#loadFromData-2"><b>loadFromData</b></a> ( QByteArray&nbsp;buf, const&nbsp;char&nbsp;*&nbsp;format = 0 )</li>
<li class=fn>bool <a href="#save"><b>save</b></a> ( const&nbsp;QString&nbsp;&amp;&nbsp;fileName, const&nbsp;char&nbsp;*&nbsp;format, int&nbsp;quality = -1 ) const</li>
<li class=fn>bool <a href="#save-2"><b>save</b></a> ( QIODevice&nbsp;*&nbsp;device, const&nbsp;char&nbsp;*&nbsp;format, int&nbsp;quality = -1 ) const</li>
<li class=fn>bool <a href="#valid"><b>valid</b></a> ( int&nbsp;x, int&nbsp;y ) const</li>
<li class=fn>int <a href="#pixelIndex"><b>pixelIndex</b></a> ( int&nbsp;x, int&nbsp;y ) const</li>
<li class=fn>QRgb <a href="#pixel"><b>pixel</b></a> ( int&nbsp;x, int&nbsp;y ) const</li>
<li class=fn>void <a href="#setPixel"><b>setPixel</b></a> ( int&nbsp;x, int&nbsp;y, uint&nbsp;index_or_rgb )</li>
<li class=fn>int <a href="#dotsPerMeterX"><b>dotsPerMeterX</b></a> () const</li>
<li class=fn>int <a href="#dotsPerMeterY"><b>dotsPerMeterY</b></a> () const</li>
<li class=fn>void <a href="#setDotsPerMeterX"><b>setDotsPerMeterX</b></a> ( int&nbsp;x )</li>
<li class=fn>void <a href="#setDotsPerMeterY"><b>setDotsPerMeterY</b></a> ( int&nbsp;y )</li>
<li class=fn>QPoint <a href="#offset"><b>offset</b></a> () const</li>
<li class=fn>void <a href="#setOffset"><b>setOffset</b></a> ( const&nbsp;QPoint&nbsp;&amp;&nbsp;p )</li>
<li class=fn>QValueList&lt;QImageTextKeyLang&gt; <a href="#textList"><b>textList</b></a> () const</li>
<li class=fn>QStringList <a href="#textLanguages"><b>textLanguages</b></a> () const</li>
<li class=fn>QStringList <a href="#textKeys"><b>textKeys</b></a> () const</li>
<li class=fn>QString <a href="#text"><b>text</b></a> ( const&nbsp;char&nbsp;*&nbsp;key, const&nbsp;char&nbsp;*&nbsp;lang = 0 ) const</li>
<li class=fn>QString <a href="#text-2"><b>text</b></a> ( const&nbsp;QImageTextKeyLang&nbsp;&amp;&nbsp;kl ) const</li>
<li class=fn>void <a href="#setText"><b>setText</b></a> ( const&nbsp;char&nbsp;*&nbsp;key, const&nbsp;char&nbsp;*&nbsp;lang, const&nbsp;QString&nbsp;&amp;&nbsp;s )</li>
</ul>
<h2>Static Public Members</h2>
<ul>
<li class=fn>QImage <a href="#fromMimeSource"><b>fromMimeSource</b></a> ( const&nbsp;QString&nbsp;&amp;&nbsp;abs_name )</li>
<li class=fn>Endian <a href="#systemBitOrder"><b>systemBitOrder</b></a> ()</li>
<li class=fn>Endian <a href="#systemByteOrder"><b>systemByteOrder</b></a> ()</li>
<li class=fn>const char * <a href="#imageFormat"><b>imageFormat</b></a> ( const&nbsp;QString&nbsp;&amp;&nbsp;fileName )</li>
<li class=fn>QStrList <a href="#inputFormats"><b>inputFormats</b></a> ()</li>
<li class=fn>QStrList <a href="#outputFormats"><b>outputFormats</b></a> ()</li>
<li class=fn>QStringList <a href="#inputFormatList"><b>inputFormatList</b></a> ()</li>
<li class=fn>QStringList <a href="#outputFormatList"><b>outputFormatList</b></a> ()</li>
</ul>
<h2>Related Functions</h2>
<ul>
<li class=fn>QDataStream &amp; <a href="#operator-lt-lt"><b>operator&lt;&lt;</b></a> ( QDataStream&nbsp;&amp;&nbsp;s, const&nbsp;QImage&nbsp;&amp;&nbsp;image )</li>
<li class=fn>QDataStream &amp; <a href="#operator-gt-gt"><b>operator&gt;&gt;</b></a> ( QDataStream&nbsp;&amp;&nbsp;s, QImage&nbsp;&amp;&nbsp;image )</li>
<li class=fn>void <a href="#bitBlt"><b>bitBlt</b></a> ( QImage&nbsp;*&nbsp;dst, int&nbsp;dx, int&nbsp;dy, const&nbsp;QImage&nbsp;*&nbsp;src, int&nbsp;sx, int&nbsp;sy, int&nbsp;sw, int&nbsp;sh, int&nbsp;conversion_flags )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>


The QImage class provides a hardware-independent pixmap
representation with direct access to the pixel data.
<p> 



<p> It is one of the two classes Qt provides for dealing with images,
the other being <a href="qpixmap.html">QPixmap</a>. QImage is designed and optimized for I/O
and for direct pixel access/manipulation. QPixmap is designed and
optimized for drawing. There are (slow) functions to convert
between QImage and QPixmap: <a href="qpixmap.html#convertToImage">QPixmap::convertToImage</a>() and
<a href="qpixmap.html#convertFromImage">QPixmap::convertFromImage</a>().
<p> An image has the parameters <a href="#width">width</a>, <a href="#height">height</a> and <a href="#depth">depth</a> (bits per
pixel, bpp), a color table and the actual <a href="#bits">pixels</a>. QImage supports 1-bpp, 8-bpp and 32-bpp image
data. 1-bpp and 8-bpp images use a color lookup table; the pixel
value is a color table index.
<p> 32-bpp images encode an RGB value in 24 bits and ignore the color
table. The most significant byte is used for the <a href="#setAlphaBuffer">alpha buffer</a>.
<p> An entry in the color table is an RGB triplet encoded as a <tt>uint</tt>. Use the <a href="qcolor.html#qRed">qRed()</a>, <a href="qcolor.html#qGreen">qGreen()</a> and <a href="qcolor.html#qBlue">qBlue()</a> functions (<a href="qcolor-h.html">qcolor.h</a>) to access the components, and <a href="qcolor.html#qRgb">qRgb</a> to make an RGB triplet (see the <a href="qcolor.html">QColor</a> class
documentation).
<p> 1-bpp (monochrome) images have a color table with a most two
colors. There are two different formats: big endian (MSB first) or
little endian (LSB first) bit order. To access a single bit you
will must do some bit shifts:
<p> <pre>
    QImage image;
    // sets bit at (x,y) to 1
    if ( image.<a href="#bitOrder">bitOrder</a>() == QImage::<a href="#Endian-enum">LittleEndian</a> )
        *(image.<a href="#scanLine">scanLine</a>(y) + (x &gt;&gt; 3)) |= 1 &lt;&lt; (x &amp; 7);
    else
        *(image.<a href="#scanLine">scanLine</a>(y) + (x &gt;&gt; 3)) |= 1 &lt;&lt; (7 - (x &amp; 7));
    </pre>
 
<p> If this looks complicated, it might be a good idea to convert the
1-bpp image to an 8-bpp image using <a href="#convertDepth">convertDepth</a>().
<p> 8-bpp images are much easier to work with than 1-bpp images
because they have a single byte per pixel:
<p> <pre>
    QImage image;
    // set entry 19 in the color table to yellow
    image.<a href="#setColor">setColor</a>( 19, qRgb(255,255,0) );
    // set 8 bit pixel at (x,y) to value yellow (in color table)
    *(image.<a href="#scanLine">scanLine</a>(y) + x) = 19;
    </pre>
 
<p> 32-bpp images ignore the color table; instead, each pixel contains
the RGB triplet. 24 bits contain the RGB value; the most
significant byte is reserved for the alpha buffer.
<p> <pre>
    QImage image;
    // sets 32 bit pixel at (x,y) to yellow.
    uint *p = (uint *)image.<a href="#scanLine">scanLine</a>(y) + x;
    *p = <a href="qcolor.html#qRgb">qRgb</a>(255,255,0);
    </pre>
 
<p> On Qt/Embedded, scanlines are aligned to the pixel depth and may
be padded to any degree, while on all other platforms, the
scanlines are 32-bit aligned for all depths. The constructor
taking a <tt>uchar*</tt> argument always expects 32-bit aligned data.
On Qt/Embedded, an additional constructor allows the number of
bytes-per-line to be specified.
<p> QImage supports a variety of methods for getting information about
the image, for example, <a href="#colorTable">colorTable</a>(), <a href="#allGray">allGray</a>(), <a href="#isGrayscale">isGrayscale</a>(),
<a href="#bitOrder">bitOrder</a>(), <a href="#bytesPerLine">bytesPerLine</a>(), <a href="#depth">depth</a>(), <a href="#dotsPerMeterX">dotsPerMeterX</a>() and
<a href="#dotsPerMeterY">dotsPerMeterY</a>(), <a href="#hasAlphaBuffer">hasAlphaBuffer</a>(), <a href="#numBytes">numBytes</a>(), <a href="#numColors">numColors</a>(), and
<a href="#width">width</a>() and <a href="#height">height</a>().
<p> Pixel colors are retrieved with <a href="#pixel">pixel</a>() and set with <a href="#setPixel">setPixel</a>().
<p> QImage also supports a number of functions for creating a new
image that is a transformed version of the original. For example,
<a href="#copy">copy</a>(), <a href="#convertBitOrder">convertBitOrder</a>(), <a href="#convertDepth">convertDepth</a>(), <a href="#createAlphaMask">createAlphaMask</a>(),
<a href="#createHeuristicMask">createHeuristicMask</a>(), <a href="#mirror">mirror</a>(), <a href="#scale">scale</a>(), <a href="#smoothScale">smoothScale</a>(), <a href="#swapRGB">swapRGB</a>()
and <a href="#xForm">xForm</a>(). There are also functions for changing attributes of
an image in-place, for example, <a href="#setAlphaBuffer">setAlphaBuffer</a>(), <a href="#setColor">setColor</a>(),
<a href="#setDotsPerMeterX">setDotsPerMeterX</a>() and <a href="#setDotsPerMeterY">setDotsPerMeterY</a>() and <a href="#setNumColors">setNumColors</a>().
<p> Images can be loaded and saved in the supported formats. Images
are saved to a file with <a href="#save">save</a>(). Images are loaded from a file
with <a href="#load">load</a>() (or in the constructor) or from an array of data with
<a href="#loadFromData">loadFromData</a>(). The lists of supported formats are available from
<a href="#inputFormatList">inputFormatList</a>() and <a href="#outputFormatList">outputFormatList</a>().
<p> Strings of text may be added to images using <a href="#setText">setText</a>().
<p> The QImage class uses explicit <a href="shclass.html">sharing</a>,
similar to that used by <a href="qmemarray.html">QMemArray</a>.
<p> New image formats can be added as <a href="plugins-howto.html">plugins</a>.
<p> <p>See also <a href="qimageio.html">QImageIO</a>, <a href="qpixmap.html">QPixmap</a>, <a href="shclass.html">Shared Classes</a>, <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a>, and <a href="shared.html">Implicitly and Explicitly Shared Classes</a>.

<hr><h2>Member Type Documentation</h2>
<h3 class=fn><a name="Endian-enum"></a>QImage::Endian</h3>

<p> This enum type is used to describe the endianness of the CPU and
graphics hardware.
<ul>
<li><tt>QImage::IgnoreEndian</tt> - Endianness does not matter. Useful for some
operations that are independent of endianness.
<li><tt>QImage::BigEndian</tt> - Network byte order, as on SPARC and Motorola CPUs.
<li><tt>QImage::LittleEndian</tt> - PC/Alpha byte order.
</ul>
<h3 class=fn><a name="ScaleMode-enum"></a>QImage::ScaleMode</h3>

<p> The functions <a href="#scale">scale</a>() and <a href="#smoothScale">smoothScale</a>() use different modes for
scaling the image. The purpose of these modes is to retain the
ratio of the image if this is required.
<p> <center><img src="scaling.png"></center> 
<ul>
<li><tt>QImage::ScaleFree</tt> - The image is scaled freely: the resulting image
fits exactly into the specified size; the ratio will not
necessarily be preserved.
<li><tt>QImage::ScaleMin</tt> - The ratio of the image is preserved and the
resulting image is guaranteed to fit into the specified size
(it is as large as possible within these constraints) - the
image might be smaller than the requested size.
<li><tt>QImage::ScaleMax</tt> - The ratio of the image is preserved and the
resulting image fills the whole specified rectangle (it is as
small as possible within these constraints) - the image might
be larger than the requested size.
</ul>
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QImage"></a>QImage::QImage ()
</h3>
Constructs a null image.
<p> <p>See also <a href="#isNull">isNull</a>().

<h3 class=fn><a name="QImage-2"></a>QImage::QImage ( int&nbsp;w, int&nbsp;h, int&nbsp;depth, int&nbsp;numColors = 0, <a href="qimage.html#Endian-enum">Endian</a>&nbsp;bitOrder = IgnoreEndian )
</h3>
Constructs an image with <em>w</em> width, <em>h</em> height, <em>depth</em> bits
per pixel, <em>numColors</em> colors and bit order <em>bitOrder</em>.
<p> Using this constructor is the same as first constructing a null
image and then calling the <a href="#create">create</a>() function.
<p> <p>See also <a href="#create">create</a>().

<h3 class=fn><a name="QImage-3"></a>QImage::QImage ( const&nbsp;<a href="qsize.html">QSize</a>&nbsp;&amp;&nbsp;size, int&nbsp;depth, int&nbsp;numColors = 0, <a href="qimage.html#Endian-enum">Endian</a>&nbsp;bitOrder = IgnoreEndian )
</h3>
Constructs an image with size <em>size</em> pixels, depth <em>depth</em> bits,
<em>numColors</em> and <em>bitOrder</em> endianness.
<p> Using this constructor is the same as first constructing a null
image and then calling the <a href="#create">create</a>() function.
<p> <p>See also <a href="#create">create</a>().

<h3 class=fn><a name="QImage-4"></a>QImage::QImage ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;fileName, const&nbsp;char&nbsp;*&nbsp;format = 0 )
</h3>
Constructs an image and tries to load the image from the file <em>fileName</em>.
<p> If <em>format</em> is specified, the loader attempts to read the image
using the specified format. If <em>format</em> is not specified (which
is the default), the loader reads a few bytes from the header to
guess the file format.
<p> If the loading of the image failed, this object is a <a href="#isNull">null</a> image.
<p> The <a href="qimageio.html">QImageIO</a> documentation lists the supported image formats and
explains how to add extra formats.
<p> <p>See also <a href="#load">load</a>(), <a href="#isNull">isNull</a>(), and <a href="qimageio.html">QImageIO</a>.

<h3 class=fn><a name="QImage-5"></a>QImage::QImage ( const&nbsp;char&nbsp;*&nbsp;const&nbsp;xpm[] )
</h3>
Constructs an image from <em>xpm</em>, which must be a valid XPM image.
<p> Errors are silently ignored.
<p> Note that it's possible to squeeze the XPM variable a little bit
by using an unusual declaration:
<p> <pre>
        static const char * const start_xpm[]={
            "16 15 8 1",
            "a c #cec6bd",
        ....
    </pre>
 
<p> The extra <tt>const</tt> makes the entire definition read-only, which is
slightly more efficient (e.g. when the code is in a shared
library) and ROMable when the application is to be stored in ROM.

<h3 class=fn><a name="QImage-6"></a>QImage::QImage ( const&nbsp;<a href="qbytearray.html">QByteArray</a>&nbsp;&amp;&nbsp;array )
</h3>
Constructs an image from the binary data <em>array</em>. It tries to
guess the file format.
<p> If the loading of the image failed, this object is a <a href="#isNull">null</a> image.
<p> <p>See also <a href="#loadFromData">loadFromData</a>(), <a href="#isNull">isNull</a>(), and <a href="#imageFormat">imageFormat</a>().

<h3 class=fn><a name="QImage-7"></a>QImage::QImage ( uchar&nbsp;*&nbsp;yourdata, int&nbsp;w, int&nbsp;h, int&nbsp;depth, QRgb&nbsp;*&nbsp;colortable, int&nbsp;numColors, <a href="qimage.html#Endian-enum">Endian</a>&nbsp;bitOrder )
</h3>
Constructs an image <em>w</em> pixels wide, <em>h</em> pixels high with a
color depth of <em>depth</em>, that uses an existing memory buffer, <em>yourdata</em>. The buffer must remain valid throughout the life of the
QImage. The image does not delete the buffer at destruction.
<p> If <em>colortable</em> is 0, a color table sufficient for <em>numColors</em>
will be allocated (and destructed later).
<p> Note that <em>yourdata</em> must be 32-bit aligned.
<p> The endianness is given in <em>bitOrder</em>.

<h3 class=fn><a name="QImage-8"></a>QImage::QImage ( uchar&nbsp;*&nbsp;yourdata, int&nbsp;w, int&nbsp;h, int&nbsp;depth, int&nbsp;bpl, QRgb&nbsp;*&nbsp;colortable, int&nbsp;numColors, <a href="qimage.html#Endian-enum">Endian</a>&nbsp;bitOrder )
</h3>
Constructs an image that uses an existing memory buffer. The
buffer must remain valid for the life of the QImage. The image
does not delete the buffer at destruction. The buffer is passed as
<em>yourdata</em>. The image's width is <em>w</em> and its height is <em>h</em>. The
color depth is <em>depth</em>. <em>bpl</em> specifies the number of bytes per
line.
<p> If <em>colortable</em> is 0, a color table sufficient for <em>numColors</em>
will be allocated (and destructed later).
<p> The endianness is specified by <em>bitOrder</em>.
<p> <b>Warning:</b> This constructor is only available on Qt/Embedded.

<h3 class=fn><a name="QImage-9"></a>QImage::QImage ( const&nbsp;<a href="qimage.html">QImage</a>&nbsp;&amp;&nbsp;image )
</h3>
Constructs a <a href="shclass.html">shallow copy</a> of <em>image</em>.

<h3 class=fn><a name="~QImage"></a>QImage::~QImage ()
</h3>
Destroys the image and cleans up.

<h3 class=fn>bool <a name="allGray"></a>QImage::allGray () const
</h3>
Returns TRUE if all the colors in the image are shades of gray
(i.e. their red, green and blue components are equal); otherwise
returns FALSE.
<p> This function is slow for large 16-bit (Qt/Embedded only) and 32-bit images.
<p> <p>See also <a href="#isGrayscale">isGrayscale</a>().

<h3 class=fn><a href="qimage.html#Endian-enum">Endian</a> <a name="bitOrder"></a>QImage::bitOrder () const
</h3>

<p> Returns the bit order for the image.
<p> If it is a 1-bpp image, this function returns either
QImage::BigEndian or QImage::LittleEndian.
<p> If it is not a 1-bpp image, this function returns
QImage::IgnoreEndian.
<p> <p>See also <a href="#depth">depth</a>().

<h3 class=fn>uchar * <a name="bits"></a>QImage::bits () const
</h3>

<p> Returns a pointer to the first pixel data. This is equivalent to
<a href="#scanLine">scanLine</a>(0).
<p> <p>See also <a href="#numBytes">numBytes</a>(), <a href="#scanLine">scanLine</a>(), and <a href="#jumpTable">jumpTable</a>().

<p>Example: <a href="qglwidget.html#x2119">opengl/texture/gltexobj.cpp</a>.
<h3 class=fn>int <a name="bytesPerLine"></a>QImage::bytesPerLine () const
</h3>

<p> Returns the number of bytes per image scanline. This is equivalent
to <a href="#numBytes">numBytes</a>()/height().
<p> <p>See also <a href="#numBytes">numBytes</a>() and <a href="#scanLine">scanLine</a>().

<h3 class=fn>QRgb <a name="color"></a>QImage::color ( int&nbsp;i ) const
</h3>

<p> Returns the color in the color table at index <em>i</em>. The first
color is at index 0.
<p> A color value is an RGB triplet. Use the <a href="qcolor.html#qRed">qRed()</a>, <a href="qcolor.html#qGreen">qGreen()</a> and <a href="qcolor.html#qBlue">qBlue()</a> functions (defined in <a href="qcolor-h.html">qcolor.h</a>) to
get the color value components.
<p> <p>See also <a href="#setColor">setColor</a>(), <a href="#numColors">numColors</a>(), and <a href="qcolor.html">QColor</a>.

<p>Example: <a href="themes-example.html#x207">themes/wood.cpp</a>.
<h3 class=fn>QRgb * <a name="colorTable"></a>QImage::colorTable () const
</h3>

<p> Returns a pointer to the color table.
<p> <p>See also <a href="#numColors">numColors</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="convertBitOrder"></a>QImage::convertBitOrder ( <a href="qimage.html#Endian-enum">Endian</a>&nbsp;bitOrder ) const
</h3>
Converts the bit order of the image to <em>bitOrder</em> and returns the
converted image. The original image is not changed.
<p> Returns <tt>*this</tt> if the <em>bitOrder</em> is equal to the image bit
order, or a <a href="#isNull">null</a> image if this image cannot
be converted.
<p> <p>See also <a href="#bitOrder">bitOrder</a>(), <a href="#systemBitOrder">systemBitOrder</a>(), and <a href="#isNull">isNull</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="convertDepth"></a>QImage::convertDepth ( int&nbsp;depth, int&nbsp;conversion_flags ) const
</h3>
Converts the depth (bpp) of the image to <em>depth</em> and returns the
converted image. The original image is not changed.
<p> The <em>depth</em> argument must be 1, 8, 16 (Qt/Embedded only) or 32.
<p> Returns <tt>*this</tt> if <em>depth</em> is equal to the image depth, or a
<a href="#isNull">null</a> image if this image cannot be
converted.
<p> If the image needs to be modified to fit in a lower-resolution
result (e.g. converting from 32-bit to 8-bit), use the <em>conversion_flags</em> to specify how you'd prefer this to happen.
<p> <p>See also <a href="qt.html#ImageConversionFlags-enum">Qt::ImageConversionFlags</a>, <a href="#depth">depth</a>(), and <a href="#isNull">isNull</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="convertDepth-2"></a>QImage::convertDepth ( int&nbsp;depth ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> 
<h3 class=fn><a href="qimage.html">QImage</a> <a name="convertDepthWithPalette"></a>QImage::convertDepthWithPalette ( int&nbsp;d, QRgb&nbsp;*&nbsp;palette, int&nbsp;palette_count, int&nbsp;conversion_flags = 0 ) const
</h3>
Returns an image with depth <em>d</em>, using the <em>palette_count</em>
colors pointed to by <em>palette</em>. If <em>d</em> is 1 or 8, the returned
image will have its color table ordered the same as <em>palette</em>.
<p> If the image needs to be modified to fit in a lower-resolution
result (e.g. converting from 32-bit to 8-bit), use the <em>conversion_flags</em> to specify how you'd prefer this to happen.
<p> Note: currently no closest-color search is made. If colors are
found that are not in the palette, the palette may not be used at
all. This result should not be considered valid because it may
change in future implementations.
<p> Currently inefficient for non-32-bit images.
<p> <p>See also <a href="qt.html#ImageConversionFlags-enum">Qt::ImageConversionFlags</a>.

<h3 class=fn><a href="qimage.html">QImage</a> <a name="copy"></a>QImage::copy () const
</h3>
Returns a <a href="shclass.html">deep copy</a> of the image.
<p> <p>See also <a href="#detach">detach</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="copy-2"></a>QImage::copy ( int&nbsp;x, int&nbsp;y, int&nbsp;w, int&nbsp;h, int&nbsp;conversion_flags = 0 ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns a <a href="shclass.html">deep copy</a> of a sub-area of
the image.
<p> The returned image is always <em>w</em> by <em>h</em> pixels in size, and is
copied from position <em>x</em>, <em>y</em> in this image. In areas beyond
this image pixels are filled with pixel 0.
<p> If the image needs to be modified to fit in a lower-resolution
result (e.g. converting from 32-bit to 8-bit), use the <em>conversion_flags</em> to specify how you'd prefer this to happen.
<p> <p>See also <a href="#bitBlt">bitBlt</a>() and <a href="qt.html#ImageConversionFlags-enum">Qt::ImageConversionFlags</a>.

<h3 class=fn><a href="qimage.html">QImage</a> <a name="copy-3"></a>QImage::copy ( const&nbsp;<a href="qrect.html">QRect</a>&nbsp;&amp;&nbsp;r ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns a <a href="shclass.html">deep copy</a> of a sub-area of
the image.
<p> The returned image always has the size of the rectangle <em>r</em>. In
areas beyond this image pixels are filled with pixel 0.

<h3 class=fn>bool <a name="create"></a>QImage::create ( int&nbsp;width, int&nbsp;height, int&nbsp;depth, int&nbsp;numColors = 0, <a href="qimage.html#Endian-enum">Endian</a>&nbsp;bitOrder = IgnoreEndian )
</h3>
Sets the image <em>width</em>, <em>height</em>, <em>depth</em>, its number of colors
(in <em>numColors</em>), and bit order. Returns TRUE if successful, or
FALSE if the parameters are incorrect or if memory cannot be
allocated.
<p> The <em>width</em> and <em>height</em> is limited to 32767. <em>depth</em> must be
1, 8, or 32. If <em>depth</em> is 1, <em>bitOrder</em> must be set to
either QImage::LittleEndian or QImage::BigEndian. For other depths
<em>bitOrder</em> must be QImage::IgnoreEndian.
<p> This function allocates a color table and a buffer for the image
data. The image data is not initialized.
<p> The image buffer is allocated as a single block that consists of a
table of <a href="#scanLine">scanline</a> pointers (<a href="#jumpTable">jumpTable</a>())
and the image data (<a href="#bits">bits</a>()).
<p> <p>See also <a href="#fill">fill</a>(), <a href="#width">width</a>(), <a href="#height">height</a>(), <a href="#depth">depth</a>(), <a href="#numColors">numColors</a>(), <a href="#bitOrder">bitOrder</a>(), <a href="#jumpTable">jumpTable</a>(), <a href="#scanLine">scanLine</a>(), <a href="#bits">bits</a>(), <a href="#bytesPerLine">bytesPerLine</a>(), and <a href="#numBytes">numBytes</a>().

<h3 class=fn>bool <a name="create-2"></a>QImage::create ( const&nbsp;<a href="qsize.html">QSize</a>&nbsp;&amp;, int&nbsp;depth, int&nbsp;numColors = 0, <a href="qimage.html#Endian-enum">Endian</a>&nbsp;bitOrder = IgnoreEndian )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> 
<h3 class=fn><a href="qimage.html">QImage</a> <a name="createAlphaMask"></a>QImage::createAlphaMask ( int&nbsp;conversion_flags = 0 ) const
</h3>
Builds and returns a 1-bpp mask from the alpha buffer in this
image. Returns a <a href="#isNull">null</a> image if <a href="#setAlphaBuffer">alpha buffer mode</a> is disabled.
<p> See <a href="qpixmap.html#convertFromImage">QPixmap::convertFromImage</a>() for a description of the <em>conversion_flags</em> argument.
<p> The returned image has little-endian bit order, which you can
convert to big-endianness using <a href="#convertBitOrder">convertBitOrder</a>().
<p> <p>See also <a href="#createHeuristicMask">createHeuristicMask</a>(), <a href="#hasAlphaBuffer">hasAlphaBuffer</a>(), and <a href="#setAlphaBuffer">setAlphaBuffer</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="createHeuristicMask"></a>QImage::createHeuristicMask ( bool&nbsp;clipTight = TRUE ) const
</h3>
Creates and returns a 1-bpp heuristic mask for this image. It
works by selecting a color from one of the corners, then chipping
away pixels of that color starting at all the edges.
<p> The four corners vote for which color is to be masked away. In
case of a draw (this generally means that this function is not
applicable to the image), the result is arbitrary.
<p> The returned image has little-endian bit order, which you can
convert to big-endianness using <a href="#convertBitOrder">convertBitOrder</a>().
<p> If <em>clipTight</em> is TRUE the mask is just large enough to cover the
pixels; otherwise, the mask is larger than the data pixels.
<p> This function disregards the <a href="#hasAlphaBuffer">alpha buffer</a>.
<p> <p>See also <a href="#createAlphaMask">createAlphaMask</a>().

<h3 class=fn>int <a name="depth"></a>QImage::depth () const
</h3>

<p> Returns the depth of the image.
<p> The image depth is the number of bits used to encode a single
pixel, also called bits per pixel (bpp) or bit planes of an image.
<p> The supported depths are 1, 8, 16 (Qt/Embedded only) and 32.
<p> <p>See also <a href="#convertDepth">convertDepth</a>().

<h3 class=fn>void <a name="detach"></a>QImage::detach ()
</h3>
Detaches from shared image data and makes sure that this image is
the only one referring to the data.
<p> If multiple images share common data, this image makes a copy of
the data and detaches itself from the sharing mechanism.
Nothing is done if there is just a single reference.
<p> <p>See also <a href="#copy">copy</a>().

<p>Example: <a href="themes-example.html#x208">themes/wood.cpp</a>.
<h3 class=fn>int <a name="dotsPerMeterX"></a>QImage::dotsPerMeterX () const
</h3>

<p> Returns the number of pixels that fit horizontally in a physical
meter. This and <a href="#dotsPerMeterY">dotsPerMeterY</a>() define the intended scale and
aspect ratio of the image.
<p> <p>See also <a href="#setDotsPerMeterX">setDotsPerMeterX</a>().

<h3 class=fn>int <a name="dotsPerMeterY"></a>QImage::dotsPerMeterY () const
</h3>

<p> Returns the number of pixels that fit vertically in a physical
meter. This and <a href="#dotsPerMeterX">dotsPerMeterX</a>() define the intended scale and
aspect ratio of the image.
<p> <p>See also <a href="#setDotsPerMeterY">setDotsPerMeterY</a>().

<h3 class=fn>void <a name="fill"></a>QImage::fill ( uint&nbsp;pixel )
</h3>
Fills the entire image with the pixel value <em>pixel</em>.
<p> If the <a href="#depth">depth</a> of this image is 1, only the
lowest bit is used. If you say <a href="#fill">fill</a>(0), fill(2), etc., the image
is filled with 0s. If you say fill(1), fill(3), etc., the image is
filled with 1s. If the depth is 8, the lowest 8 bits are used.
<p> If the depth is 32 and the image has no alpha buffer, the <em>pixel</em>
value is written to each pixel in the image. If the image has an
alpha buffer, only the 24 RGB bits are set and the upper 8 bits
(alpha value) are left unchanged.
<p> Note: <a href="#pixel">QImage::pixel</a>() returns the color of the pixel at the given
coordinates; <a href="qcolor.html#pixel">QColor::pixel</a>() returns the pixel value of the
underlying window system (essentially an index value), so normally
you will want to use QImage::pixel() to use a color from an
existing image or <a href="qcolor.html#rgb">QColor::rgb</a>() to use a specific color.
<p> <p>See also <a href="#invertPixels">invertPixels</a>(), <a href="#depth">depth</a>(), <a href="#hasAlphaBuffer">hasAlphaBuffer</a>(), and <a href="#create">create</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="fromMimeSource"></a>QImage::fromMimeSource ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;abs_name )<tt> [static]</tt>
</h3> Convenience function. Gets the data associated with the absolute
name <em>abs_name</em> from the default mime source factory and decodes it
to an image.
<p> <p>See also <a href="qmimesourcefactory.html">QMimeSourceFactory</a>, <a href="#fromMimeSource">QImage::fromMimeSource</a>(), and <a href="qimagedrag.html#decode">QImageDrag::decode</a>().

<h3 class=fn>bool <a name="hasAlphaBuffer"></a>QImage::hasAlphaBuffer () const
</h3>

<p> Returns TRUE if alpha buffer mode is enabled; otherwise returns
FALSE.
<p> <p>See also <a href="#setAlphaBuffer">setAlphaBuffer</a>().

<h3 class=fn>int <a name="height"></a>QImage::height () const
</h3>

<p> Returns the height of the image.
<p> <p>See also <a href="#width">width</a>(), <a href="#size">size</a>(), and <a href="#rect">rect</a>().

<p>Examples: <a href="canvas-example.html#x2932">canvas/canvas.cpp</a> and <a href="qglwidget.html#x2120">opengl/texture/gltexobj.cpp</a>.
<h3 class=fn>const char * <a name="imageFormat"></a>QImage::imageFormat ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;fileName )<tt> [static]</tt>
</h3>
Returns a string that specifies the image format of the file <em>fileName</em>, or 0 if the file cannot be read or if the format is not
recognized.
<p> The <a href="qimageio.html">QImageIO</a> documentation lists the guaranteed supported image
formats, or use <a href="#inputFormats">QImage::inputFormats</a>() and <a href="#outputFormats">QImage::outputFormats</a>()
to get lists that include the installed formats.
<p> <p>See also <a href="#load">load</a>() and <a href="#save">save</a>().

<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="inputFormatList"></a>QImage::inputFormatList ()<tt> [static]</tt>
</h3>
Returns a list of image formats that are supported for image
input.
<p> Note that if you want to iterate over the list, you should iterate
over a copy, e.g.
<pre>
    <a href="qstringlist.html">QStringList</a> list = myImage.inputFormatList();
    QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
    while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
        myProcessing( *it );
        ++it;
    }
    </pre>
 
<p> <p>See also <a href="#outputFormatList">outputFormatList</a>(), <a href="#inputFormats">inputFormats</a>(), and <a href="qimageio.html">QImageIO</a>.

<p>Example: <a href="showimg-example.html#x1321">showimg/showimg.cpp</a>.
<h3 class=fn><a href="qstrlist.html">QStrList</a> <a name="inputFormats"></a>QImage::inputFormats ()<tt> [static]</tt>
</h3>
Returns a list of image formats that are supported for image
input.
<p> <p>See also <a href="#outputFormats">outputFormats</a>(), <a href="#inputFormatList">inputFormatList</a>(), and <a href="qimageio.html">QImageIO</a>.

<h3 class=fn>void <a name="invertPixels"></a>QImage::invertPixels ( bool&nbsp;invertAlpha = TRUE )
</h3>
Inverts all pixel values in the image.
<p> If the depth is 32: if <em>invertAlpha</em> is TRUE, the alpha bits are
also inverted, otherwise they are left unchanged.
<p> If the depth is not 32, the argument <em>invertAlpha</em> has no
meaning.
<p> Note that inverting an 8-bit image means to replace all pixels
using color index <em>i</em> with a pixel using color index 255 minus <em>i</em>. Similarly for a 1-bit image. The color table is not changed.
<p> <p>See also <a href="#fill">fill</a>(), <a href="#depth">depth</a>(), and <a href="#hasAlphaBuffer">hasAlphaBuffer</a>().

<h3 class=fn>bool <a name="isGrayscale"></a>QImage::isGrayscale () const
</h3>
For 16-bit (Qt/Embedded only) and 32-bit images, this function is
equivalent to <a href="#allGray">allGray</a>().
<p> For 8-bpp images, this function returns TRUE if <a href="#color">color</a>(i) is
QRgb(i,i,i) for all indices of the color table; otherwise returns
FALSE.
<p> <p>See also <a href="#allGray">allGray</a>() and <a href="#depth">depth</a>().

<h3 class=fn>bool <a name="isNull"></a>QImage::isNull () const
</h3>

<p> Returns TRUE if it is a null image; otherwise returns FALSE.
<p> A null image has all parameters set to zero and no allocated data.

<p>Example: <a href="showimg-example.html#x1322">showimg/showimg.cpp</a>.
<h3 class=fn>uchar ** <a name="jumpTable"></a>QImage::jumpTable () const
</h3>

<p> Returns a pointer to the scanline pointer table.
<p> This is the beginning of the data block for the image.
<p> <p>See also <a href="#bits">bits</a>() and <a href="#scanLine">scanLine</a>().

<h3 class=fn>bool <a name="load"></a>QImage::load ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;fileName, const&nbsp;char&nbsp;*&nbsp;format = 0 )
</h3>
Loads an image from the file <em>fileName</em>. Returns TRUE if the
image was successfully loaded; otherwise returns FALSE.
<p> If <em>format</em> is specified, the loader attempts to read the image
using the specified format. If <em>format</em> is not specified (which
is the default), the loader reads a few bytes from the header to
guess the file format.
<p> The <a href="qimageio.html">QImageIO</a> documentation lists the supported image formats and
explains how to add extra formats.
<p> <p>See also <a href="#loadFromData">loadFromData</a>(), <a href="#save">save</a>(), <a href="#imageFormat">imageFormat</a>(), <a href="qpixmap.html#load">QPixmap::load</a>(), and <a href="qimageio.html">QImageIO</a>.

<h3 class=fn>bool <a name="loadFromData"></a>QImage::loadFromData ( const&nbsp;uchar&nbsp;*&nbsp;buf, uint&nbsp;len, const&nbsp;char&nbsp;*&nbsp;format = 0 )
</h3>
Loads an image from the first <em>len</em> bytes of binary data in <em>buf</em>. Returns TRUE if the image was successfully loaded; otherwise
returns FALSE.
<p> If <em>format</em> is specified, the loader attempts to read the image
using the specified format. If <em>format</em> is not specified (which
is the default), the loader reads a few bytes from the header to
guess the file format.
<p> The <a href="qimageio.html">QImageIO</a> documentation lists the supported image formats and
explains how to add extra formats.
<p> <p>See also <a href="#load">load</a>(), <a href="#save">save</a>(), <a href="#imageFormat">imageFormat</a>(), <a href="qpixmap.html#loadFromData">QPixmap::loadFromData</a>(), and <a href="qimageio.html">QImageIO</a>.

<h3 class=fn>bool <a name="loadFromData-2"></a>QImage::loadFromData ( <a href="qbytearray.html">QByteArray</a>&nbsp;buf, const&nbsp;char&nbsp;*&nbsp;format = 0 )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Loads an image from the <a href="qbytearray.html">QByteArray</a> <em>buf</em>.

<h3 class=fn><a href="qimage.html">QImage</a> <a name="mirror"></a>QImage::mirror () const
</h3>
Returns a QImage which is a vertically mirrored copy of this
image. The original QImage is not changed.

<h3 class=fn><a href="qimage.html">QImage</a> <a name="mirror-2"></a>QImage::mirror ( bool&nbsp;horizontal, bool&nbsp;vertical ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns a mirror of the image, mirrored in the horizontal and/or
the vertical direction depending on whether <em>horizontal</em> and <em>vertical</em> are set to TRUE or FALSE. The original image is not
changed.
<p> <p>See also <a href="#smoothScale">smoothScale</a>().

<h3 class=fn>int <a name="numBytes"></a>QImage::numBytes () const
</h3>

<p> Returns the number of bytes occupied by the image data.
<p> <p>See also <a href="#bytesPerLine">bytesPerLine</a>() and <a href="#bits">bits</a>().

<h3 class=fn>int <a name="numColors"></a>QImage::numColors () const
</h3>

<p> Returns the size of the color table for the image.
<p> Notice that <a href="#numColors">numColors</a>() returns 0 for 16-bpp (Qt/Embedded only)
and 32-bpp images because these images do not use color tables,
but instead encode pixel values as RGB triplets.
<p> <p>See also <a href="#setNumColors">setNumColors</a>() and <a href="#colorTable">colorTable</a>().

<p>Example: <a href="themes-example.html#x209">themes/wood.cpp</a>.
<h3 class=fn><a href="qpoint.html">QPoint</a> <a name="offset"></a>QImage::offset () const
</h3>

<p> Returns the number of pixels by which the image is intended to be
offset by when positioning relative to other images.

<h3 class=fn>bool <a name="operator!-eq"></a>QImage::operator!= ( const&nbsp;<a href="qimage.html">QImage</a>&nbsp;&amp;&nbsp;i ) const
</h3>
Returns TRUE if this image and image <em>i</em> have different contents;
otherwise returns FALSE. The comparison can be slow, unless there
is some obvious difference, such as different widths, in which
case the function will return quickly.
<p> <p>See also <a href="#operator-eq">operator=</a>().

<h3 class=fn><a href="qimage.html">QImage</a>&nbsp;&amp; <a name="operator-eq"></a>QImage::operator= ( const&nbsp;<a href="qimage.html">QImage</a>&nbsp;&amp;&nbsp;image )
</h3>
Assigns a <a href="shclass.html">shallow copy</a> of <em>image</em> to
this image and returns a reference to this image.
<p> <p>See also <a href="#copy">copy</a>().

<h3 class=fn><a href="qimage.html">QImage</a>&nbsp;&amp; <a name="operator-eq-2"></a>QImage::operator= ( const&nbsp;<a href="qpixmap.html">QPixmap</a>&nbsp;&amp;&nbsp;pixmap )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Sets the image bits to the <em>pixmap</em> contents and returns a
reference to the image.
<p> If the image shares data with other images, it will first
dereference the shared data.
<p> Makes a call to <a href="qpixmap.html#convertToImage">QPixmap::convertToImage</a>().

<h3 class=fn>bool <a name="operator-eq-eq"></a>QImage::operator== ( const&nbsp;<a href="qimage.html">QImage</a>&nbsp;&amp;&nbsp;i ) const
</h3>
Returns TRUE if this image and image <em>i</em> have the same contents;
otherwise returns FALSE. The comparison can be slow, unless there
is some obvious difference, such as different widths, in which
case the function will return quickly.
<p> <p>See also <a href="#operator-eq">operator=</a>().

<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="outputFormatList"></a>QImage::outputFormatList ()<tt> [static]</tt>
</h3>
Returns a list of image formats that are supported for image
output.
<p> Note that if you want to iterate over the list, you should iterate
over a copy, e.g.
<pre>
    <a href="qstringlist.html">QStringList</a> list = myImage.outputFormatList();
    QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
    while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
        myProcessing( *it );
        ++it;
    }
    </pre>
 
<p> <p>See also <a href="#inputFormatList">inputFormatList</a>(), <a href="#outputFormats">outputFormats</a>(), and <a href="qimageio.html">QImageIO</a>.

<h3 class=fn><a href="qstrlist.html">QStrList</a> <a name="outputFormats"></a>QImage::outputFormats ()<tt> [static]</tt>
</h3>
Returns a list of image formats that are supported for image
output.
<p> <p>See also <a href="#inputFormats">inputFormats</a>(), <a href="#outputFormatList">outputFormatList</a>(), and <a href="qimageio.html">QImageIO</a>.

<p>Example: <a href="showimg-example.html#x1323">showimg/showimg.cpp</a>.
<h3 class=fn>QRgb <a name="pixel"></a>QImage::pixel ( int&nbsp;x, int&nbsp;y ) const
</h3>
Returns the color of the pixel at the coordinates (<em>x</em>, <em>y</em>).
<p> If (<em>x</em>, <em>y</em>) is not <a href="#valid">on the image</a>, the
results are undefined.
<p> <p>See also <a href="#setPixel">setPixel</a>(), <a href="qcolor.html#qRed">qRed</a>(), <a href="qcolor.html#qGreen">qGreen</a>(), <a href="qcolor.html#qBlue">qBlue</a>(), and <a href="#valid">valid</a>().

<p>Examples: <a href="canvas-example.html#x2933">canvas/canvas.cpp</a> and <a href="qmag-example.html#x1776">qmag/qmag.cpp</a>.
<h3 class=fn>int <a name="pixelIndex"></a>QImage::pixelIndex ( int&nbsp;x, int&nbsp;y ) const
</h3>
Returns the pixel index at the given coordinates.
<p> If (<em>x</em>, <em>y</em>) is not <a href="#valid">valid</a>, or if the
image is not a paletted image (<a href="#depth">depth</a>() &gt; 8), the results are
undefined.
<p> <p>See also <a href="#valid">valid</a>() and <a href="#depth">depth</a>().

<h3 class=fn><a href="qrect.html">QRect</a> <a name="rect"></a>QImage::rect () const
</h3>

<p> Returns the enclosing rectangle (0, 0, <a href="#width">width</a>(), <a href="#height">height</a>()) of the
image.
<p> <p>See also <a href="#width">width</a>(), <a href="#height">height</a>(), and <a href="#size">size</a>().

<h3 class=fn>void <a name="reset"></a>QImage::reset ()
</h3>
Resets all image parameters and deallocates the image data.

<h3 class=fn>bool <a name="save"></a>QImage::save ( const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;fileName, const&nbsp;char&nbsp;*&nbsp;format, int&nbsp;quality = -1 ) const
</h3>
Saves the image to the file <em>fileName</em>, using the image file
format <em>format</em> and a quality factor of <em>quality</em>. <em>quality</em>
must be in the range 0..100 or -1. Specify 0 to obtain small
compressed files, 100 for large uncompressed files, and -1 (the
default) to use the default settings.
<p> Returns TRUE if the image was successfully saved; otherwise
returns FALSE.
<p> <p>See also <a href="#load">load</a>(), <a href="#loadFromData">loadFromData</a>(), <a href="#imageFormat">imageFormat</a>(), <a href="qpixmap.html#save">QPixmap::save</a>(), and <a href="qimageio.html">QImageIO</a>.

<h3 class=fn>bool <a name="save-2"></a>QImage::save ( <a href="qiodevice.html">QIODevice</a>&nbsp;*&nbsp;device, const&nbsp;char&nbsp;*&nbsp;format, int&nbsp;quality = -1 ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> This function writes a QImage to the <a href="qiodevice.html">QIODevice</a>, <em>device</em>. This
can be used, for example, to save an image directly into a
QByteArray:
<pre>
    QImage image;
    <a href="qbytearray.html">QByteArray</a> ba;
    <a href="qbuffer.html">QBuffer</a> buffer( ba );
    buffer.<a href="qiodevice.html#open">open</a>( <a href="qfile.html#open">IO_WriteOnly</a> );
    image.<a href="#save">save</a>( &amp;buffer, "PNG" ); // writes image into ba in PNG format
    </pre>
 

<h3 class=fn><a href="qimage.html">QImage</a> <a name="scale"></a>QImage::scale ( int&nbsp;w, int&nbsp;h, <a href="qimage.html#ScaleMode-enum">ScaleMode</a>&nbsp;mode = ScaleFree ) const
</h3>
Returns a copy of the image scaled to a rectangle of width <em>w</em>
and height <em>h</em> according to the ScaleMode <em>mode</em>.
<p> <ul>
<li> If <em>mode</em> is <a href="#ScaleMode-enum">ScaleFree</a>, the image is scaled to (<em>w</em>,
<em>h</em>).
<li> If <em>mode</em> is <a href="#ScaleMode-enum">ScaleMin</a>, the image is scaled to a rectangle
as large as possible inside (<em>w</em>, <em>h</em>), preserving the aspect
ratio.
<li> If <em>mode</em> is <a href="#ScaleMode-enum">ScaleMax</a>, the image is scaled to a rectangle
as small as possible outside (<em>w</em>, <em>h</em>), preserving the aspect
ratio.
</ul>
<p> If either the width <em>w</em> or the height <em>h</em> is 0 or negative, this
function returns a <a href="#isNull">null</a> image.
<p> This function uses a simple, fast algorithm. If you need better
quality, use <a href="#smoothScale">smoothScale</a>() instead.
<p> <p>See also <a href="#scaleWidth">scaleWidth</a>(), <a href="#scaleHeight">scaleHeight</a>(), <a href="#smoothScale">smoothScale</a>(), and <a href="#xForm">xForm</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="scale-2"></a>QImage::scale ( const&nbsp;<a href="qsize.html">QSize</a>&nbsp;&amp;&nbsp;s, <a href="qimage.html#ScaleMode-enum">ScaleMode</a>&nbsp;mode = ScaleFree ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> The requested size of the image is <em>s</em>.

<h3 class=fn><a href="qimage.html">QImage</a> <a name="scaleHeight"></a>QImage::scaleHeight ( int&nbsp;h ) const
</h3>
Returns a scaled copy of the image. The returned image has a
height of <em>h</em> pixels. This function automatically calculates the
width of the image so that the ratio of the image is preserved.
<p> If <em>h</em> is 0 or negative a <a href="#isNull">null</a> image is
returned.
<p> <p>See also <a href="#scale">scale</a>(), <a href="#scaleWidth">scaleWidth</a>(), <a href="#smoothScale">smoothScale</a>(), and <a href="#xForm">xForm</a>().

<p>Example: <a href="small-table-example-example.html#x2799">table/small-table-demo/main.cpp</a>.
<h3 class=fn><a href="qimage.html">QImage</a> <a name="scaleWidth"></a>QImage::scaleWidth ( int&nbsp;w ) const
</h3>
Returns a scaled copy of the image. The returned image has a width
of <em>w</em> pixels. This function automatically calculates the height
of the image so that the ratio of the image is preserved.
<p> If <em>w</em> is 0 or negative a <a href="#isNull">null</a> image is
returned.
<p> <p>See also <a href="#scale">scale</a>(), <a href="#scaleHeight">scaleHeight</a>(), <a href="#smoothScale">smoothScale</a>(), and <a href="#xForm">xForm</a>().

<h3 class=fn>uchar * <a name="scanLine"></a>QImage::scanLine ( int&nbsp;i ) const
</h3>

<p> Returns a pointer to the pixel data at the scanline with index <em>i</em>. The first scanline is at index 0.
<p> The scanline data is aligned on a 32-bit boundary.
<p> <b>Warning:</b> If you are accessing 32-bpp image data, cast the returned
pointer to <tt>QRgb*</tt> (QRgb has a 32-bit size) and use it to
read/write the pixel value. You cannot use the <tt>uchar*</tt> pointer
directly, because the pixel format depends on the byte order on
the underlying platform. Hint: use <a href="qcolor.html#qRed">qRed()</a>,
<a href="qcolor.html#qGreen">qGreen()</a> and <a href="qcolor.html#qBlue">qBlue()</a>, etc. (qcolor.h) to access the pixels.
<p> <b>Warning:</b> If you are accessing 16-bpp image data, you must handle
endianness yourself. (Qt/Embedded only)
<p> <p>See also <a href="#bytesPerLine">bytesPerLine</a>(), <a href="#bits">bits</a>(), and <a href="#jumpTable">jumpTable</a>().

<p>Example: <a href="desktop-example.html#x1729">desktop/desktop.cpp</a>.
<h3 class=fn>void <a name="setAlphaBuffer"></a>QImage::setAlphaBuffer ( bool&nbsp;enable )
</h3>
Enables alpha buffer mode if <em>enable</em> is TRUE, otherwise disables
it. The default setting is disabled.
<p> An 8-bpp image has 8-bit pixels. A pixel is an index into the
<a href="#color">color table</a>, which contains 32-bit color
values. In a 32-bpp image, the 32-bit pixels are the color values.
<p> This 32-bit value is encoded as follows: The lower 24 bits are
used for the red, green, and blue components. The upper 8 bits
contain the alpha component.
<p> The alpha component specifies the transparency of a pixel. 0 means
completely transparent and 255 means opaque. The alpha component
is ignored if you do not enable alpha buffer mode.
<p> The alpha buffer is used to set a mask when a QImage is translated
to a <a href="qpixmap.html">QPixmap</a>.
<p> <p>See also <a href="#hasAlphaBuffer">hasAlphaBuffer</a>() and <a href="#createAlphaMask">createAlphaMask</a>().

<h3 class=fn>void <a name="setColor"></a>QImage::setColor ( int&nbsp;i, QRgb&nbsp;c )
</h3>

<p> Sets a color in the color table at index <em>i</em> to <em>c</em>.
<p> A color value is an RGB triplet. Use the <a href="qcolor.html#qRgb">qRgb()</a> function (defined in <a href="qcolor-h.html">qcolor.h</a>) to make RGB
triplets.
<p> <p>See also <a href="#color">color</a>(), <a href="#setNumColors">setNumColors</a>(), and <a href="#numColors">numColors</a>().

<p>Examples: <a href="desktop-example.html#x1730">desktop/desktop.cpp</a> and <a href="themes-example.html#x210">themes/wood.cpp</a>.
<h3 class=fn>void <a name="setDotsPerMeterX"></a>QImage::setDotsPerMeterX ( int&nbsp;x )
</h3>
Sets the value returned by <a href="#dotsPerMeterX">dotsPerMeterX</a>() to <em>x</em>.

<h3 class=fn>void <a name="setDotsPerMeterY"></a>QImage::setDotsPerMeterY ( int&nbsp;y )
</h3>
Sets the value returned by <a href="#dotsPerMeterY">dotsPerMeterY</a>() to <em>y</em>.

<h3 class=fn>void <a name="setNumColors"></a>QImage::setNumColors ( int&nbsp;numColors )
</h3>
Resizes the color table to <em>numColors</em> colors.
<p> If the color table is expanded all the extra colors will be set to
black (RGB 0,0,0).
<p> <p>See also <a href="#numColors">numColors</a>(), <a href="#color">color</a>(), <a href="#setColor">setColor</a>(), and <a href="#colorTable">colorTable</a>().

<h3 class=fn>void <a name="setOffset"></a>QImage::setOffset ( const&nbsp;<a href="qpoint.html">QPoint</a>&nbsp;&amp;&nbsp;p )
</h3>
Sets the value returned by <a href="#offset">offset</a>() to <em>p</em>.

<h3 class=fn>void <a name="setPixel"></a>QImage::setPixel ( int&nbsp;x, int&nbsp;y, uint&nbsp;index_or_rgb )
</h3>
Sets the pixel index or color at the coordinates (<em>x</em>, <em>y</em>) to
<em>index_or_rgb</em>.
<p> If (<em>x</em>, <em>y</em>) is not <a href="#valid">valid</a>, the result is
undefined.
<p> If the image is a paletted image (<a href="#depth">depth</a>() &lt;= 8) and <em>index_or_rgb</em> &gt;= <a href="#numColors">numColors</a>(), the result is undefined.
<p> <p>See also <a href="#pixelIndex">pixelIndex</a>(), <a href="#pixel">pixel</a>(), <a href="qcolor.html#qRgb">qRgb</a>(), <a href="qcolor.html#qRgba">qRgba</a>(), and <a href="#valid">valid</a>().

<h3 class=fn>void <a name="setText"></a>QImage::setText ( const&nbsp;char&nbsp;*&nbsp;key, const&nbsp;char&nbsp;*&nbsp;lang, const&nbsp;<a href="qstring.html">QString</a>&nbsp;&amp;&nbsp;s )
</h3>
Records string <em>s</em> for the keyword <em>key</em>. The <em>key</em> should be a
portable keyword recognizable by other software - some suggested
values can be found in <a href="http://www.libpng.org/pub/png/spec/1.2/png-1.2-pdg.html#C.Anc-text">the PNG specification</a>. <em>s</em> can be any text. <em>lang</em>
should specify the language code (see
<a href="http://www.rfc-editor.org/rfc/rfc1766.txt">RFC 1766</a>) or 0.

<h3 class=fn><a href="qsize.html">QSize</a> <a name="size"></a>QImage::size () const
</h3>

<p> Returns the size of the image, i.e. its width and height.
<p> <p>See also <a href="#width">width</a>(), <a href="#height">height</a>(), and <a href="#rect">rect</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="smoothScale"></a>QImage::smoothScale ( int&nbsp;w, int&nbsp;h, <a href="qimage.html#ScaleMode-enum">ScaleMode</a>&nbsp;mode = ScaleFree ) const
</h3>
Returns a smoothly scaled copy of the image. The returned image
has a size of width <em>w</em> by height <em>h</em> pixels if <em>mode</em> is <a href="#ScaleMode-enum">ScaleFree</a>. The modes <a href="#ScaleMode-enum">ScaleMin</a> and <a href="#ScaleMode-enum">ScaleMax</a> may be used to
preserve the ratio of the image: if <em>mode</em> is <a href="#ScaleMode-enum">ScaleMin</a>, the
returned image is guaranteed to fit into the rectangle specified
by <em>w</em> and <em>h</em> (it is as large as possible within the
constraints); if <em>mode</em> is <a href="#ScaleMode-enum">ScaleMax</a>, the returned image fits
at least into the specified rectangle (it is a small as possible
within the constraints).
<p> For 32-bpp images and 1-bpp/8-bpp color images the result will be
32-bpp, whereas <a href="#allGray">all-gray</a> images
(including black-and-white 1-bpp) will produce 8-bit <a href="#isGrayscale">grayscale</a> images with the palette spanning
256 grays from black to white.
<p> This function uses code based on pnmscale.c by Jef Poskanzer.
<p> pnmscale.c - read a portable anymap and scale it
<p> 
<p> Copyright (C) 1989, 1991 by Jef Poskanzer.
<p> Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that copyright notice and this permission
notice appear in supporting documentation. This software is
provided "as is" without express or implied warranty.
<p> <p>See also <a href="#scale">scale</a>() and <a href="#mirror">mirror</a>().

<h3 class=fn><a href="qimage.html">QImage</a> <a name="smoothScale-2"></a>QImage::smoothScale ( const&nbsp;<a href="qsize.html">QSize</a>&nbsp;&amp;&nbsp;s, <a href="qimage.html#ScaleMode-enum">ScaleMode</a>&nbsp;mode = ScaleFree ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> The requested size of the image is <em>s</em>.

<h3 class=fn><a href="qimage.html">QImage</a> <a name="swapRGB"></a>QImage::swapRGB () const
</h3>
Returns a QImage in which the values of the red and blue
components of all pixels have been swapped, effectively converting
an RGB image to a BGR image. The original QImage is not changed.

<h3 class=fn><a href="qimage.html#Endian-enum">Endian</a> <a name="systemBitOrder"></a>QImage::systemBitOrder ()<tt> [static]</tt>
</h3>
Determines the bit order of the display hardware. Returns
QImage::LittleEndian (LSB first) or QImage::BigEndian (MSB first).
<p> <p>See also <a href="#systemByteOrder">systemByteOrder</a>().

<h3 class=fn><a href="qimage.html#Endian-enum">Endian</a> <a name="systemByteOrder"></a>QImage::systemByteOrder ()<tt> [static]</tt>
</h3>
Determines the host computer byte order. Returns
QImage::LittleEndian (LSB first) or QImage::BigEndian (MSB first).
<p> <p>See also <a href="#systemBitOrder">systemBitOrder</a>().

<h3 class=fn><a href="qstring.html">QString</a> <a name="text"></a>QImage::text ( const&nbsp;char&nbsp;*&nbsp;key, const&nbsp;char&nbsp;*&nbsp;lang = 0 ) const
</h3>
Returns the string recorded for the keyword <em>key</em> in language <em>lang</em>, or in a default language if <em>lang</em> is 0.

<h3 class=fn><a href="qstring.html">QString</a> <a name="text-2"></a>QImage::text ( const&nbsp;QImageTextKeyLang&nbsp;&amp;&nbsp;kl ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns the string recorded for the keyword and language <em>kl</em>.

<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="textKeys"></a>QImage::textKeys () const
</h3>
Returns the keywords for which some texts are recorded.
<p> Note that if you want to iterate over the list, you should iterate
over a copy, e.g.
<pre>
    <a href="qstringlist.html">QStringList</a> list = myImage.textKeys();
    QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
    while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
        myProcessing( *it );
        ++it;
    }
    </pre>
 
<p> <p>See also <a href="#textList">textList</a>(), <a href="#text">text</a>(), <a href="#setText">setText</a>(), and <a href="#textLanguages">textLanguages</a>().

<h3 class=fn><a href="qstringlist.html">QStringList</a> <a name="textLanguages"></a>QImage::textLanguages () const
</h3>
Returns the language identifiers for which some texts are
recorded.
<p> Note that if you want to iterate over the list, you should iterate
over a copy, e.g.
<pre>
    <a href="qstringlist.html">QStringList</a> list = myImage.textLanguages();
    QStringList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
    while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
        myProcessing( *it );
        ++it;
    }
    </pre>
 
<p> <p>See also <a href="#textList">textList</a>(), <a href="#text">text</a>(), <a href="#setText">setText</a>(), and <a href="#textKeys">textKeys</a>().

<h3 class=fn><a href="qvaluelist.html">QValueList</a>&lt;QImageTextKeyLang&gt; <a name="textList"></a>QImage::textList () const
</h3>
Returns a list of QImageTextKeyLang objects that enumerate all the
texts key/language pairs set by <a href="#setText">setText</a>() for this image.
<p> Note that if you want to iterate over the list, you should iterate
over a copy, e.g.
<pre>
    <a href="qvaluelist.html">QValueList</a>&lt;QImageTextKeyLang&gt; list = myImage.textList();
    QValueList&lt;QImageTextKeyLang&gt;::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
    while( it != list.<a href="qvaluelist.html#end">end</a>() ) {
        myProcessing( *it );
        ++it;
    }
    </pre>
 

<h3 class=fn>bool <a name="valid"></a>QImage::valid ( int&nbsp;x, int&nbsp;y ) const
</h3>
Returns TRUE if ( <em>x</em>, <em>y</em> ) is a valid coordinate in the image;
otherwise returns FALSE.
<p> <p>See also <a href="#width">width</a>(), <a href="#height">height</a>(), and <a href="#pixelIndex">pixelIndex</a>().

<p>Examples: <a href="canvas-example.html#x2934">canvas/canvas.cpp</a> and <a href="qmag-example.html#x1777">qmag/qmag.cpp</a>.
<h3 class=fn>int <a name="width"></a>QImage::width () const
</h3>

<p> Returns the width of the image.
<p> <p>See also <a href="#height">height</a>(), <a href="#size">size</a>(), and <a href="#rect">rect</a>().

<p>Examples: <a href="canvas-example.html#x2935">canvas/canvas.cpp</a> and <a href="qglwidget.html#x2121">opengl/texture/gltexobj.cpp</a>.
<h3 class=fn><a href="qimage.html">QImage</a> <a name="xForm"></a>QImage::xForm ( const&nbsp;<a href="qwmatrix.html">QWMatrix</a>&nbsp;&amp;&nbsp;matrix ) const
</h3>
Returns a copy of the image that is transformed using the
<a href="qwmatrix.html#TransformationMode">transformation matrix</a>, <em>matrix</em>.
<p> The transformation <em>matrix</em> is internally adjusted to compensate
for unwanted translation, i.e. <a href="#xForm">xForm</a>() returns the smallest image
that contains all the transformed points of the original image.
<p> <p>See also <a href="#scale">scale</a>(), <a href="qpixmap.html#xForm">QPixmap::xForm</a>(), <a href="qpixmap.html#trueMatrix">QPixmap::trueMatrix</a>(), and <a href="qwmatrix.html">QWMatrix</a>.

<hr><h2>Related Functions</h2>
<h3 class=fn>void <a name="bitBlt"></a>bitBlt ( <a href="qimage.html">QImage</a>&nbsp;*&nbsp;dst, int&nbsp;dx, int&nbsp;dy, const&nbsp;<a href="qimage.html">QImage</a>&nbsp;*&nbsp;src, int&nbsp;sx, int&nbsp;sy, int&nbsp;sw, int&nbsp;sh, int&nbsp;conversion_flags )
</h3>

<p> Copies a block of pixels from <em>src</em> to <em>dst</em>. The pixels
copied from source (src) are converted according to
<em>conversion_flags</em> if it is incompatible with the destination
(<em>dst</em>).
<p> <em>sx</em>, <em>sy</em> is the top-left pixel in <em>src</em>, <em>dx</em>, <em>dy</em>
is the top-left position in <em>dst</em> and <em>sw</em>, \sh is the
size of the copied block.
<p> The copying is clipped if areas outside <em>src</em> or <em>dst</em> are
specified.
<p> If <em>sw</em> is -1, it is adjusted to src->width(). Similarly, if <em>sh</em> is -1, it is adjusted to src->height().
<p> Currently inefficient for non 32-bit images.

<h3 class=fn><a href="qdatastream.html">QDataStream</a>&nbsp;&amp; <a name="operator-lt-lt"></a>operator&lt;&lt; ( <a href="qdatastream.html">QDataStream</a>&nbsp;&amp;&nbsp;s, const&nbsp;<a href="qimage.html">QImage</a>&nbsp;&amp;&nbsp;image )
</h3>

<p> Writes the image <em>image</em> to the stream <em>s</em> as a PNG image, or as a
BMP image if the stream's version is 1.
<p> Note that writing the stream to a file will not produce a valid image file.
<p> <p>See also <a href="#save">QImage::save</a>() and <a href="datastreamformat.html">Format of the QDataStream operators</a>.

<h3 class=fn><a href="qdatastream.html">QDataStream</a>&nbsp;&amp; <a name="operator-gt-gt"></a>operator&gt;&gt; ( <a href="qdatastream.html">QDataStream</a>&nbsp;&amp;&nbsp;s, <a href="qimage.html">QImage</a>&nbsp;&amp;&nbsp;image )
</h3>

<p> Reads an image from the stream <em>s</em> and stores it in <em>image</em>.
<p> <p>See also <a href="#load">QImage::load</a>() and <a href="datastreamformat.html">Format of the QDataStream operators</a>.

<!-- eof -->
<hr><p>
This file is part of the <a href="index.html">Qt toolkit</a>.
Copyright &copy; 1995-2007
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt 3.3.8</div>
</table></div></address></body>
</html>