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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "common/stream.h"
#include "common/textconsole.h"
#include "graphics/pixelformat.h"
#include "graphics/surface.h"
#include "graphics/decoders/pcx.h"
/**
* Based on the PCX specs:
* http://www.fileformat.info/format/pcx/spec/a10e75307b3a4cc49c3bbe6db4c41fa2/view.htm
* and the PCX decoder of FFmpeg (libavcodec/pcx.c):
* http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavcodec/pcx.c
*/
namespace Graphics {
PCXDecoder::PCXDecoder() {
_surface = 0;
_palette = 0;
_paletteColorCount = 0;
}
PCXDecoder::~PCXDecoder() {
destroy();
}
void PCXDecoder::destroy() {
if (_surface) {
_surface->free();
delete _surface;
_surface = 0;
}
delete[] _palette;
_palette = 0;
_paletteColorCount = 0;
}
bool PCXDecoder::loadStream(Common::SeekableReadStream &stream) {
destroy();
if (stream.readByte() != 0x0a) // ZSoft PCX
return false;
byte version = stream.readByte(); // 0 - 5
if (version > 5)
return false;
bool compressed = stream.readByte(); // encoding, 1 = run length encoding
byte bitsPerPixel = stream.readByte(); // 1, 2, 4 or 8
// Window
uint16 xMin = stream.readUint16LE();
uint16 yMin = stream.readUint16LE();
uint16 xMax = stream.readUint16LE();
uint16 yMax = stream.readUint16LE();
uint16 width = xMax - xMin + 1;
uint16 height = yMax - yMin + 1;
if (xMax < xMin || yMax < yMin) {
warning("Invalid PCX image dimensions");
return false;
}
stream.skip(4); // HDpi, VDpi
// Read the EGA palette (colormap)
_palette = new byte[16 * 3];
for (uint16 i = 0; i < 16; i++) {
_palette[i * 3 + 0] = stream.readByte();
_palette[i * 3 + 1] = stream.readByte();
_palette[i * 3 + 2] = stream.readByte();
}
if (stream.readByte() != 0) // reserved, should be set to 0
return false;
byte nPlanes = stream.readByte();
uint16 bytesPerLine = stream.readUint16LE();
uint16 bytesPerscanLine = nPlanes * bytesPerLine;
if (bytesPerscanLine < width * bitsPerPixel * nPlanes / 8) {
warning("PCX data is corrupted");
return false;
}
stream.skip(60); // PaletteInfo, HscreenSize, VscreenSize, Filler
_surface = new Graphics::Surface();
byte *scanLine = new byte[bytesPerscanLine];
byte *dst;
int x, y;
if (nPlanes == 3 && bitsPerPixel == 8) { // 24bpp
Graphics::PixelFormat format = Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0);
_surface->create(width, height, format);
dst = (byte *)_surface->getPixels();
_paletteColorCount = 0;
for (y = 0; y < height; y++) {
decodeRLE(stream, scanLine, bytesPerscanLine, compressed);
for (x = 0; x < width; x++) {
byte b = scanLine[x];
byte g = scanLine[x + bytesPerLine];
byte r = scanLine[x + (bytesPerLine << 1)];
uint32 color = format.RGBToColor(r, g, b);
*((uint32 *)dst) = color;
dst += format.bytesPerPixel;
}
}
} else if (nPlanes == 1 && bitsPerPixel == 8) { // 8bpp indexed
_surface->create(width, height, Graphics::PixelFormat::createFormatCLUT8());
dst = (byte *)_surface->getPixels();
_paletteColorCount = 16;
for (y = 0; y < height; y++, dst += _surface->pitch) {
decodeRLE(stream, scanLine, bytesPerscanLine, compressed);
memcpy(dst, scanLine, width);
}
if (version == 5) {
if (stream.readByte() != 12) {
warning("Expected a palette after the PCX image data");
delete[] scanLine;
return false;
}
// Read the VGA palette
delete[] _palette;
_palette = new byte[256 * 3];
for (uint16 i = 0; i < 256; i++) {
_palette[i * 3 + 0] = stream.readByte();
_palette[i * 3 + 1] = stream.readByte();
_palette[i * 3 + 2] = stream.readByte();
}
_paletteColorCount = 256;
}
} else if ((nPlanes == 2 || nPlanes == 3 || nPlanes == 4) && bitsPerPixel == 1) { // planar, 4, 8 or 16 colors
_surface->create(width, height, Graphics::PixelFormat::createFormatCLUT8());
dst = (byte *)_surface->getPixels();
_paletteColorCount = 16;
for (y = 0; y < height; y++, dst += _surface->pitch) {
decodeRLE(stream, scanLine, bytesPerscanLine, compressed);
for (x = 0; x < width; x++) {
int m = 0x80 >> (x & 7), v = 0;
for (int i = nPlanes - 1; i >= 0; i--) {
v <<= 1;
v += (scanLine[i * bytesPerLine + (x >> 3)] & m) == 0 ? 0 : 1;
}
dst[x] = v;
}
}
} else {
// Known unsupported case: 1 plane and bpp < 8 (1, 2 or 4)
warning("Invalid PCX file (%d planes, %d bpp)", nPlanes, bitsPerPixel);
delete[] scanLine;
return false;
}
delete[] scanLine;
return true;
}
void PCXDecoder::decodeRLE(Common::SeekableReadStream &stream, byte *dst, uint32 bytesPerscanLine, bool compressed) {
uint32 i = 0;
byte run, value;
if (compressed) {
while (i < bytesPerscanLine) {
run = 1;
value = stream.readByte();
if (value >= 0xc0) {
run = value & 0x3f;
value = stream.readByte();
}
while (i < bytesPerscanLine && run--)
dst[i++] = value;
}
} else {
stream.read(dst, bytesPerscanLine);
}
}
} // End of namespace Graphics
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