mirror of https://github.com/FreeRDP/FreeRDP
568 lines
12 KiB
C
568 lines
12 KiB
C
/**
|
|
* FreeRDP: A Remote Desktop Protocol Client
|
|
* RLE Compressed Bitmap Stream
|
|
*
|
|
* Copyright 2011 Jay Sorg <jay.sorg@gmail.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/* do not compile the file directly */
|
|
|
|
/**
|
|
* Write a foreground/background image to a destination buffer.
|
|
*/
|
|
static uint8* WRITEFGBGIMAGE(uint8* pbDest, uint32 rowDelta,
|
|
uint8 bitmask, PIXEL fgPel, uint32 cBits)
|
|
{
|
|
PIXEL xorPixel;
|
|
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit0)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit1)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit2)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit3)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit4)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit5)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit6)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
DESTREADPIXEL(xorPixel, pbDest - rowDelta);
|
|
if (bitmask & g_MaskBit7)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel ^ fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, xorPixel);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return pbDest;
|
|
}
|
|
|
|
/**
|
|
* Write a foreground/background image to a destination buffer
|
|
* for the first line of compressed data.
|
|
*/
|
|
static uint8* WRITEFIRSTLINEFGBGIMAGE(uint8* pbDest, uint8 bitmask,
|
|
PIXEL fgPel, uint32 cBits)
|
|
{
|
|
if (bitmask & g_MaskBit0)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
if (bitmask & g_MaskBit1)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
if (bitmask & g_MaskBit2)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
if (bitmask & g_MaskBit3)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
if (bitmask & g_MaskBit4)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
if (bitmask & g_MaskBit5)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
if (bitmask & g_MaskBit6)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
cBits = cBits - 1;
|
|
if (cBits > 0)
|
|
{
|
|
if (bitmask & g_MaskBit7)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
}
|
|
else
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
}
|
|
DESTNEXTPIXEL(pbDest);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return pbDest;
|
|
}
|
|
|
|
/**
|
|
* Decompress an RLE compressed bitmap.
|
|
*/
|
|
void RLEDECOMPRESS(uint8* pbSrcBuffer, uint32 cbSrcBuffer, uint8* pbDestBuffer,
|
|
uint32 rowDelta, uint32 width, uint32 height)
|
|
{
|
|
uint8* pbSrc = pbSrcBuffer;
|
|
uint8* pbEnd = pbSrcBuffer + cbSrcBuffer;
|
|
uint8* pbDest = pbDestBuffer;
|
|
|
|
PIXEL temp;
|
|
PIXEL fgPel = WHITE_PIXEL;
|
|
boolean fInsertFgPel = False;
|
|
boolean fFirstLine = True;
|
|
|
|
uint8 bitmask;
|
|
PIXEL pixelA, pixelB;
|
|
|
|
uint32 runLength;
|
|
uint32 code;
|
|
|
|
uint32 advance;
|
|
|
|
RLEEXTRA
|
|
|
|
while (pbSrc < pbEnd)
|
|
{
|
|
/* Watch out for the end of the first scanline. */
|
|
if (fFirstLine)
|
|
{
|
|
if (pbDest - pbDestBuffer >= rowDelta)
|
|
{
|
|
fFirstLine = False;
|
|
fInsertFgPel = False;
|
|
}
|
|
}
|
|
|
|
/*
|
|
Extract the compression order code ID from the compression
|
|
order header.
|
|
*/
|
|
code = ExtractCodeId(*pbSrc);
|
|
|
|
/* Handle Background Run Orders. */
|
|
if (code == REGULAR_BG_RUN || code == MEGA_MEGA_BG_RUN)
|
|
{
|
|
runLength = ExtractRunLength(code, pbSrc, &advance);
|
|
pbSrc = pbSrc + advance;
|
|
if (fFirstLine)
|
|
{
|
|
if (fInsertFgPel)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
while (runLength >= UNROLL_COUNT)
|
|
{
|
|
UNROLL(
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
DESTNEXTPIXEL(pbDest); );
|
|
runLength = runLength - UNROLL_COUNT;
|
|
}
|
|
while (runLength > 0)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (fInsertFgPel)
|
|
{
|
|
DESTREADPIXEL(temp, pbDest - rowDelta);
|
|
DESTWRITEPIXEL(pbDest, temp ^ fgPel);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
while (runLength >= UNROLL_COUNT)
|
|
{
|
|
UNROLL(
|
|
DESTREADPIXEL(temp, pbDest - rowDelta);
|
|
DESTWRITEPIXEL(pbDest, temp);
|
|
DESTNEXTPIXEL(pbDest); );
|
|
runLength = runLength - UNROLL_COUNT;
|
|
}
|
|
while (runLength > 0)
|
|
{
|
|
DESTREADPIXEL(temp, pbDest - rowDelta);
|
|
DESTWRITEPIXEL(pbDest, temp);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
}
|
|
/* A follow-on background run order will need a foreground pel inserted. */
|
|
fInsertFgPel = True;
|
|
continue;
|
|
}
|
|
|
|
/* For any of the other run-types a follow-on background run
|
|
order does not need a foreground pel inserted. */
|
|
fInsertFgPel = False;
|
|
|
|
switch (code)
|
|
{
|
|
/* Handle Foreground Run Orders. */
|
|
case REGULAR_FG_RUN:
|
|
case MEGA_MEGA_FG_RUN:
|
|
case LITE_SET_FG_FG_RUN:
|
|
case MEGA_MEGA_SET_FG_RUN:
|
|
runLength = ExtractRunLength(code, pbSrc, &advance);
|
|
pbSrc = pbSrc + advance;
|
|
if (code == LITE_SET_FG_FG_RUN || code == MEGA_MEGA_SET_FG_RUN)
|
|
{
|
|
SRCREADPIXEL(fgPel, pbSrc);
|
|
SRCNEXTPIXEL(pbSrc);
|
|
}
|
|
if (fFirstLine)
|
|
{
|
|
while (runLength >= UNROLL_COUNT)
|
|
{
|
|
UNROLL(
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
DESTNEXTPIXEL(pbDest); );
|
|
runLength = runLength - UNROLL_COUNT;
|
|
}
|
|
while (runLength > 0)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, fgPel);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (runLength >= UNROLL_COUNT)
|
|
{
|
|
UNROLL(
|
|
DESTREADPIXEL(temp, pbDest - rowDelta);
|
|
DESTWRITEPIXEL(pbDest, temp ^ fgPel);
|
|
DESTNEXTPIXEL(pbDest); );
|
|
runLength = runLength - UNROLL_COUNT;
|
|
}
|
|
while (runLength > 0)
|
|
{
|
|
DESTREADPIXEL(temp, pbDest - rowDelta);
|
|
DESTWRITEPIXEL(pbDest, temp ^ fgPel);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* Handle Dithered Run Orders. */
|
|
case LITE_DITHERED_RUN:
|
|
case MEGA_MEGA_DITHERED_RUN:
|
|
runLength = ExtractRunLength(code, pbSrc, &advance);
|
|
pbSrc = pbSrc + advance;
|
|
SRCREADPIXEL(pixelA, pbSrc);
|
|
SRCNEXTPIXEL(pbSrc);
|
|
SRCREADPIXEL(pixelB, pbSrc);
|
|
SRCNEXTPIXEL(pbSrc);
|
|
while (runLength >= UNROLL_COUNT)
|
|
{
|
|
UNROLL(
|
|
DESTWRITEPIXEL(pbDest, pixelA);
|
|
DESTNEXTPIXEL(pbDest);
|
|
DESTWRITEPIXEL(pbDest, pixelB);
|
|
DESTNEXTPIXEL(pbDest); );
|
|
runLength = runLength - UNROLL_COUNT;
|
|
}
|
|
while (runLength > 0)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, pixelA);
|
|
DESTNEXTPIXEL(pbDest);
|
|
DESTWRITEPIXEL(pbDest, pixelB);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
break;
|
|
|
|
/* Handle Color Run Orders. */
|
|
case REGULAR_COLOR_RUN:
|
|
case MEGA_MEGA_COLOR_RUN:
|
|
runLength = ExtractRunLength(code, pbSrc, &advance);
|
|
pbSrc = pbSrc + advance;
|
|
SRCREADPIXEL(pixelA, pbSrc);
|
|
SRCNEXTPIXEL(pbSrc);
|
|
while (runLength >= UNROLL_COUNT)
|
|
{
|
|
UNROLL(
|
|
DESTWRITEPIXEL(pbDest, pixelA);
|
|
DESTNEXTPIXEL(pbDest); );
|
|
runLength = runLength - UNROLL_COUNT;
|
|
}
|
|
while (runLength > 0)
|
|
{
|
|
DESTWRITEPIXEL(pbDest, pixelA);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
break;
|
|
|
|
/* Handle Foreground/Background Image Orders. */
|
|
case REGULAR_FGBG_IMAGE:
|
|
case MEGA_MEGA_FGBG_IMAGE:
|
|
case LITE_SET_FG_FGBG_IMAGE:
|
|
case MEGA_MEGA_SET_FGBG_IMAGE:
|
|
runLength = ExtractRunLength(code, pbSrc, &advance);
|
|
pbSrc = pbSrc + advance;
|
|
if (code == LITE_SET_FG_FGBG_IMAGE || code == MEGA_MEGA_SET_FGBG_IMAGE)
|
|
{
|
|
SRCREADPIXEL(fgPel, pbSrc);
|
|
SRCNEXTPIXEL(pbSrc);
|
|
}
|
|
if (fFirstLine)
|
|
{
|
|
while (runLength > 8)
|
|
{
|
|
bitmask = *pbSrc;
|
|
pbSrc = pbSrc + 1;
|
|
pbDest = WRITEFIRSTLINEFGBGIMAGE(pbDest, bitmask, fgPel, 8);
|
|
runLength = runLength - 8;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (runLength > 8)
|
|
{
|
|
bitmask = *pbSrc;
|
|
pbSrc = pbSrc + 1;
|
|
pbDest = WRITEFGBGIMAGE(pbDest, rowDelta, bitmask, fgPel, 8);
|
|
runLength = runLength - 8;
|
|
}
|
|
}
|
|
if (runLength > 0)
|
|
{
|
|
bitmask = *pbSrc;
|
|
pbSrc = pbSrc + 1;
|
|
if (fFirstLine)
|
|
{
|
|
pbDest = WRITEFIRSTLINEFGBGIMAGE(pbDest, bitmask, fgPel, runLength);
|
|
}
|
|
else
|
|
{
|
|
pbDest = WRITEFGBGIMAGE(pbDest, rowDelta, bitmask, fgPel, runLength);
|
|
}
|
|
}
|
|
break;
|
|
|
|
/* Handle Color Image Orders. */
|
|
case REGULAR_COLOR_IMAGE:
|
|
case MEGA_MEGA_COLOR_IMAGE:
|
|
runLength = ExtractRunLength(code, pbSrc, &advance);
|
|
pbSrc = pbSrc + advance;
|
|
while (runLength >= UNROLL_COUNT)
|
|
{
|
|
UNROLL(
|
|
SRCREADPIXEL(temp, pbSrc);
|
|
SRCNEXTPIXEL(pbSrc);
|
|
DESTWRITEPIXEL(pbDest, temp);
|
|
DESTNEXTPIXEL(pbDest); );
|
|
runLength = runLength - UNROLL_COUNT;
|
|
}
|
|
while (runLength > 0)
|
|
{
|
|
SRCREADPIXEL(temp, pbSrc);
|
|
SRCNEXTPIXEL(pbSrc);
|
|
DESTWRITEPIXEL(pbDest, temp);
|
|
DESTNEXTPIXEL(pbDest);
|
|
runLength = runLength - 1;
|
|
}
|
|
break;
|
|
|
|
/* Handle Special Order 1. */
|
|
case SPECIAL_FGBG_1:
|
|
pbSrc = pbSrc + 1;
|
|
if (fFirstLine)
|
|
{
|
|
pbDest = WRITEFIRSTLINEFGBGIMAGE(pbDest, g_MaskSpecialFgBg1, fgPel, 8);
|
|
}
|
|
else
|
|
{
|
|
pbDest = WRITEFGBGIMAGE(pbDest, rowDelta, g_MaskSpecialFgBg1, fgPel, 8);
|
|
}
|
|
break;
|
|
|
|
/* Handle Special Order 2. */
|
|
case SPECIAL_FGBG_2:
|
|
pbSrc = pbSrc + 1;
|
|
if (fFirstLine)
|
|
{
|
|
pbDest = WRITEFIRSTLINEFGBGIMAGE(pbDest, g_MaskSpecialFgBg2, fgPel, 8);
|
|
}
|
|
else
|
|
{
|
|
pbDest = WRITEFGBGIMAGE(pbDest, rowDelta, g_MaskSpecialFgBg2, fgPel, 8);
|
|
}
|
|
break;
|
|
|
|
/* Handle White Order. */
|
|
case SPECIAL_WHITE:
|
|
pbSrc = pbSrc + 1;
|
|
DESTWRITEPIXEL(pbDest, WHITE_PIXEL);
|
|
DESTNEXTPIXEL(pbDest);
|
|
break;
|
|
|
|
/* Handle Black Order. */
|
|
case SPECIAL_BLACK:
|
|
pbSrc = pbSrc + 1;
|
|
DESTWRITEPIXEL(pbDest, BLACK_PIXEL);
|
|
DESTNEXTPIXEL(pbDest);
|
|
break;
|
|
}
|
|
}
|
|
}
|