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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2014
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* planar bitmap compressor
* 32 bpp compression
*/
/*
RDP 6.0 Bitmap Compression
http://msdn.microsoft.com/en-us/library/cc241877.aspx
*/
#include "libxrdp.h"
/*****************************************************************************/
/* returns the number of lines compressed */
int APP_CC
xrdp_bitmap32_compress(char *in_data, int width, int height,
struct stream *s, int bpp, int byte_limit,
int start_line, struct stream *temp_s,
int e)
{
int pixel;
int *ptr32;
char *ptr8;
char *alpha_data;
char *red_data;
char *green_data;
char *blue_data;
int alpha_bytes;
int red_bytes;
int green_bytes;
int blue_bytes;
int iindex;
int jindex;
int cx;
int cy;
int header;
header = 0x20; /* no alpha TODO */
cx = width + e;
cy = 0;
alpha_data = g_malloc(cx * height * 4, 0);
red_data = alpha_data + cx * height;
green_data = red_data + cx * height;
blue_data = green_data + cx * height;
alpha_bytes = 0;
red_bytes = 0;
green_bytes = 0;
blue_bytes = 0;
/* split planes */
while (start_line >= 0)
{
ptr32 = (int *) (in_data + start_line * width * 4);
for (iindex = 0; iindex < width; iindex++)
{
pixel = *ptr32;
ptr32++;
alpha_data[alpha_bytes] = pixel >> 24;
alpha_bytes++;
red_data[red_bytes] = pixel >> 16;
red_bytes++;
green_data[green_bytes] = pixel >> 8;
green_bytes++;
blue_data[blue_bytes] = pixel >> 0;
blue_bytes++;
}
for (iindex = 0; iindex < e; iindex++)
{
alpha_data[alpha_bytes] = 0;
alpha_bytes++;
red_data[red_bytes] = 0;
red_bytes++;
green_data[green_bytes] = 0;
green_bytes++;
blue_data[blue_bytes] = 0;
blue_bytes++;
}
start_line--;
cy++;
}
out_uint8(s, header);
out_uint8a(s, red_data, red_bytes);
out_uint8a(s, green_data, green_bytes);
out_uint8a(s, blue_data, blue_bytes);
if ((header & 0x10) == 0)
{
/* pad if no RLE */
out_uint8(s, 0x00);
}
g_free(alpha_data);
return cy;
}
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