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