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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/bmp.h"
namespace Graphics {
BitmapDecoder::BitmapDecoder() {
_surface = 0;
_palette = 0;
_paletteColorCount = 0;
}
BitmapDecoder::~BitmapDecoder() {
destroy();
}
void BitmapDecoder::destroy() {
if (_surface) {
_surface->free();
delete _surface; _surface = 0;
}
delete[] _palette; _palette = 0;
_paletteColorCount = 0;
}
bool BitmapDecoder::loadStream(Common::SeekableReadStream &stream) {
destroy();
if (stream.readByte() != 'B')
return false;
if (stream.readByte() != 'M')
return false;
/* uint32 fileSize = */ stream.readUint32LE();
/* uint16 res1 = */ stream.readUint16LE();
/* uint16 res2 = */ stream.readUint16LE();
uint32 imageOffset = stream.readUint32LE();
uint32 infoSize = stream.readUint32LE();
if (infoSize != 40) {
warning("Only Windows v3 bitmaps are supported");
return false;
}
uint32 width = stream.readUint32LE();
int32 height = stream.readSint32LE();
if (width == 0 || height == 0)
return false;
if (height < 0) {
warning("Right-side up bitmaps not supported");
return false;
}
/* uint16 planes = */ stream.readUint16LE();
uint16 bitsPerPixel = stream.readUint16LE();
if (bitsPerPixel != 8 && bitsPerPixel != 24 && bitsPerPixel != 32) {
warning("%dbpp bitmaps not supported", bitsPerPixel);
return false;
}
uint32 compression = stream.readUint32LE();
if (compression != 0) {
warning("Compressed bitmaps not supported");
return false;
}
/* uint32 imageSize = */ stream.readUint32LE();
/* uint32 pixelsPerMeterX = */ stream.readUint32LE();
/* uint32 pixelsPerMeterY = */ stream.readUint32LE();
_paletteColorCount = stream.readUint32LE();
/* uint32 colorsImportant = */ stream.readUint32LE();
if (bitsPerPixel == 8) {
if (_paletteColorCount == 0)
_paletteColorCount = 256;
// Read the palette
_palette = new byte[_paletteColorCount * 3];
for (uint16 i = 0; i < _paletteColorCount; i++) {
_palette[i * 3 + 2] = stream.readByte();
_palette[i * 3 + 1] = stream.readByte();
_palette[i * 3 + 0] = stream.readByte();
stream.readByte();
}
}
// Start us at the beginning of the image
stream.seek(imageOffset);
Graphics::PixelFormat format = Graphics::PixelFormat::createFormatCLUT8();
// BGRA for 24bpp and 32 bpp
if (bitsPerPixel == 24 || bitsPerPixel == 32)
format = Graphics::PixelFormat(4, 8, 8, 8, 8, 8, 16, 24, 0);
_surface = new Graphics::Surface();
_surface->create(width, height, format);
int srcPitch = width * (bitsPerPixel >> 3);
const int extraDataLength = (srcPitch % 4) ? 4 - (srcPitch % 4) : 0;
if (bitsPerPixel == 8) {
byte *dst = (byte *)_surface->pixels;
for (int32 i = 0; i < height; i++) {
stream.read(dst + (height - i - 1) * width, width);
stream.skip(extraDataLength);
}
} else if (bitsPerPixel == 24) {
byte *dst = (byte *)_surface->pixels + (height - 1) * _surface->pitch;
for (int32 i = 0; i < height; i++) {
for (uint32 j = 0; j < width; j++) {
byte b = stream.readByte();
byte g = stream.readByte();
byte r = stream.readByte();
uint32 color = format.RGBToColor(r, g, b);
*((uint32 *)dst) = color;
dst += format.bytesPerPixel;
}
stream.skip(extraDataLength);
dst -= _surface->pitch * 2;
}
} else { // 32 bpp
byte *dst = (byte *)_surface->pixels + (height - 1) * _surface->pitch;
for (int32 i = 0; i < height; i++) {
for (uint32 j = 0; j < width; j++) {
byte b = stream.readByte();
byte g = stream.readByte();
byte r = stream.readByte();
// Ignore the last byte, as in v3 it is unused
// and should thus NOT be used as alpha.
// ref: http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376%28v=vs.85%29.aspx
stream.readByte();
uint32 color = format.RGBToColor(r, g, b);
*((uint32 *)dst) = color;
dst += format.bytesPerPixel;
}
stream.skip(extraDataLength);
dst -= _surface->pitch * 2;
}
}
return true;
}
} // End of namespace Graphics
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