diff options
Diffstat (limited to 'debian/imlib/imlib-1.9.15/gdk_imlib/io-jpeg.c')
| -rw-r--r-- | debian/imlib/imlib-1.9.15/gdk_imlib/io-jpeg.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/debian/imlib/imlib-1.9.15/gdk_imlib/io-jpeg.c b/debian/imlib/imlib-1.9.15/gdk_imlib/io-jpeg.c new file mode 100644 index 00000000..f619d2e7 --- /dev/null +++ b/debian/imlib/imlib-1.9.15/gdk_imlib/io-jpeg.c @@ -0,0 +1,171 @@ +#include <config.h> +#include <setjmp.h> +#include "gdk_imlib.h" +#include "gdk_imlib_private.h" + +#ifdef HAVE_LIBJPEG +#include <jpeglib.h> + +/** + * This error handling is broken beyond belief, but oh well it works + **/ + +struct ImLib_JPEG_error_mgr +{ + struct jpeg_error_mgr pub; + sigjmp_buf setjmp_buffer; +}; + +typedef struct ImLib_JPEG_error_mgr *emptr; + +static void +g_JPEGFatalErrorHandler(j_common_ptr cinfo) +{ + /* FIXME: + * We should somehow signal what error occurred to the caller so the + * caller can handle the error message */ + emptr errmgr; + + errmgr = (emptr) cinfo->err; + cinfo->err->output_message(cinfo); + siglongjmp(errmgr->setjmp_buffer, 1); + return; +} + +unsigned char * +loader_jpeg (FILE * f, int *w, int *h, int *t) +{ + struct jpeg_decompress_struct cinfo; + struct ImLib_JPEG_error_mgr jerr; + unsigned char *data, *line[16], *ptr; + int x, y, i; + + *t = 0; + cinfo.err = jpeg_std_error(&(jerr.pub)); + jerr.pub.error_exit = g_JPEGFatalErrorHandler; + + /* error handler to longjmp to, we want to preserve signals */ + if (sigsetjmp(jerr.setjmp_buffer, 1)) + { + /* Whoops there was a jpeg error */ + jpeg_destroy_decompress(&cinfo); + return NULL; + } + + jpeg_create_decompress(&cinfo); + jpeg_stdio_src(&cinfo, f); + jpeg_read_header(&cinfo, TRUE); + cinfo.do_fancy_upsampling = FALSE; + cinfo.do_block_smoothing = FALSE; + jpeg_start_decompress(&cinfo); + *w = cinfo.output_width; + *h = cinfo.output_height; + data = _gdk_malloc_image(*w, *h); + if (!data) + { + jpeg_destroy_decompress(&cinfo); + return NULL; + } + ptr = data; + + if (cinfo.rec_outbuf_height > 16) + { + fprintf(stderr, "gdk_imlib ERROR: JPEG uses line buffers > 16. Cannot load.\n"); + return NULL; + } + if (cinfo.output_components == 3) + { + for (y = 0; y < *h; y += cinfo.rec_outbuf_height) + { + for (i = 0; i < cinfo.rec_outbuf_height; i++) + { + line[i] = ptr; + ptr += *w * 3; + } + jpeg_read_scanlines(&cinfo, line, cinfo.rec_outbuf_height); + } + } + else if (cinfo.output_components == 1) + { + for (i = 0; i < cinfo.rec_outbuf_height; i++) + { + if ((line[i] = malloc(*w)) == NULL) + { + int t = 0; + + for (t = 0; t < i; t++) + free(line[t]); + jpeg_destroy_decompress(&cinfo); + return NULL; + } + } + for (y = 0; y < *h; y += cinfo.rec_outbuf_height) + { + jpeg_read_scanlines(&cinfo, line, cinfo.rec_outbuf_height); + for (i = 0; i < cinfo.rec_outbuf_height; i++) + { + for (x = 0; x < *w; x++) + { + *ptr++ = line[i][x]; + *ptr++ = line[i][x]; + *ptr++ = line[i][x]; + } + } + } + for (i = 0; i < cinfo.rec_outbuf_height; i++) + free(line[i]); + } + jpeg_finish_decompress(&cinfo); + jpeg_destroy_decompress(&cinfo); + + return data; +} + +gint +saver_jpeg (GdkImlibImage *im, char *file, GdkImlibSaveInfo *info) +{ + struct jpeg_compress_struct cinfo; + struct jpeg_error_mgr jerr; + JSAMPROW row_pointer[1]; + int row_stride; + FILE *f; + + f = fopen(file, "wb"); + if (f) + { + cinfo.err = jpeg_std_error(&jerr); + jpeg_create_compress(&cinfo); + jpeg_stdio_dest(&cinfo, f); + cinfo.image_width = im->rgb_width; + cinfo.image_height = im->rgb_height; + cinfo.input_components = 3; + cinfo.in_color_space = JCS_RGB; + jpeg_set_defaults(&cinfo); + jpeg_set_quality(&cinfo, (100 * info->quality) >> 8, TRUE); + jpeg_start_compress(&cinfo, TRUE); + row_stride = cinfo.image_width * 3; + while (cinfo.next_scanline < cinfo.image_height) + { + row_pointer[0] = im->rgb_data + (cinfo.next_scanline * row_stride); + jpeg_write_scanlines(&cinfo, row_pointer, 1); + } + jpeg_finish_compress(&cinfo); + fclose(f); + return 1; + } + return 0; +} + +#else +unsigned char * +loader_jpeg (FILE * f, int *w, int *h, int *t) +{ + return NULL; +} + +gint +saver_jpeg (GdkImlibImage *im, char *file, GdkImlibSaveInfo *info) +{ + return 0; +} +#endif |