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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 "image/codecs/bmp_raw.h"
#include "common/stream.h"
#include "common/textconsole.h"
#include "graphics/surface.h"
namespace Image {
BitmapRawDecoder::BitmapRawDecoder(int width, int height, int bitsPerPixel) : Codec(),
_width(width), _height(height), _bitsPerPixel(bitsPerPixel) {
_surface.create(_width, _height, getPixelFormat());
}
BitmapRawDecoder::~BitmapRawDecoder() {
_surface.free();
}
const Graphics::Surface *BitmapRawDecoder::decodeFrame(Common::SeekableReadStream &stream) {
Graphics::PixelFormat format = getPixelFormat();
int srcPitch = _width * (_bitsPerPixel >> 3);
int extraDataLength = (srcPitch % 4) ? 4 - (srcPitch % 4) : 0;
if (_bitsPerPixel == 1) {
srcPitch = (_width + 7) / 8;
extraDataLength = (srcPitch % 2) ? 2 - (srcPitch % 2) : 0;
}
if (_bitsPerPixel == 1) {
for (int i = 0; i < _height; i++) {
byte *dst = (byte *)_surface.getBasePtr(0, i);
for (int j = 0; j != _width;) {
byte color = stream.readByte();
for (int k = 0; k < 8; k++) {
*dst++ = (color & 0x80) ? 0x0f : 0x00;
color <<= 1;
j++;
if (j == _width) {
break;
}
}
}
stream.skip(extraDataLength);
}
} else if (_bitsPerPixel == 4) {
for (int i = 0; i < _height; i++) {
byte *dst = (byte *)_surface.getBasePtr(0, _height - i - 1);
for (int j = 0; j < _width; j++) {
byte color = stream.readByte();
*dst++ = (color & 0xf0) >> 4;
j++;
if (j ==_width)
break;
*dst++ = color & 0x0f;
}
stream.skip(extraDataLength);
}
} else if (_bitsPerPixel == 8) {
byte *dst = (byte *)_surface.getPixels();
for (int i = 0; i < _height; i++) {
stream.read(dst + (_height - i - 1) * _width, _width);
stream.skip(extraDataLength);
}
} else if (_bitsPerPixel == 24) {
byte *dst = (byte *)_surface.getBasePtr(0, _height - 1);
for (int i = 0; i < _height; i++) {
for (int 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.getBasePtr(0, _height - 1);
for (int i = 0; i < _height; i++) {
for (int 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 &_surface;
}
Graphics::PixelFormat BitmapRawDecoder::getPixelFormat() const {
switch (_bitsPerPixel) {
case 1:
case 4:
case 8:
return Graphics::PixelFormat::createFormatCLUT8();
case 24:
case 32:
return Graphics::PixelFormat(4, 8, 8, 8, 8, 8, 16, 24, 0);
default:
break;
}
error("Unhandled BMP raw %dbpp", _bitsPerPixel);
}
} // End of namespace Image
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