mirror of
https://github.com/libretro/scummvm.git
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132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "image/bmp.h"
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#include "common/stream.h"
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#include "common/substream.h"
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#include "common/textconsole.h"
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#include "graphics/pixelformat.h"
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#include "graphics/surface.h"
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#include "image/codecs/codec.h"
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namespace Image {
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BitmapDecoder::BitmapDecoder() {
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_surface = 0;
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_palette = 0;
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_paletteColorCount = 0;
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_codec = 0;
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}
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BitmapDecoder::~BitmapDecoder() {
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destroy();
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}
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void BitmapDecoder::destroy() {
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_surface = 0;
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delete[] _palette;
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_palette = 0;
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_paletteColorCount = 0;
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delete _codec;
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_codec = 0;
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}
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bool BitmapDecoder::loadStream(Common::SeekableReadStream &stream) {
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destroy();
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if (stream.readByte() != 'B')
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return false;
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if (stream.readByte() != 'M')
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return false;
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/* uint32 fileSize = */ stream.readUint32LE();
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/* uint16 res1 = */ stream.readUint16LE();
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/* uint16 res2 = */ stream.readUint16LE();
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uint32 imageOffset = stream.readUint32LE();
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uint32 infoSize = stream.readUint32LE();
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if (infoSize != 40) {
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warning("Only Windows v3 bitmaps are supported");
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return false;
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}
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uint32 width = stream.readUint32LE();
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int32 height = stream.readSint32LE();
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if (width == 0 || height == 0)
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return false;
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if (height < 0) {
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warning("Right-side up bitmaps not supported");
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return false;
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}
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/* uint16 planes = */ stream.readUint16LE();
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uint16 bitsPerPixel = stream.readUint16LE();
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if (bitsPerPixel != 8 && bitsPerPixel != 24 && bitsPerPixel != 32) {
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warning("%dbpp bitmaps not supported", bitsPerPixel);
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return false;
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}
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uint32 compression = stream.readUint32BE();
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uint32 imageSize = stream.readUint32LE();
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/* uint32 pixelsPerMeterX = */ stream.readUint32LE();
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/* uint32 pixelsPerMeterY = */ stream.readUint32LE();
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_paletteColorCount = stream.readUint32LE();
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/* uint32 colorsImportant = */ stream.readUint32LE();
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if (bitsPerPixel == 8) {
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if (_paletteColorCount == 0)
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_paletteColorCount = 256;
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// Read the palette
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_palette = new byte[_paletteColorCount * 3];
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for (uint16 i = 0; i < _paletteColorCount; i++) {
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_palette[i * 3 + 2] = stream.readByte();
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_palette[i * 3 + 1] = stream.readByte();
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_palette[i * 3 + 0] = stream.readByte();
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stream.readByte();
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}
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}
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// Create the codec (it will warn about unhandled compression)
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_codec = createBitmapCodec(compression, width, height, bitsPerPixel);
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if (!_codec)
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return false;
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// Grab the frame data
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Common::SeekableSubReadStream subStream(&stream, imageOffset, imageOffset + imageSize);
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// We only support raw bitmaps for now
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_surface = _codec->decodeFrame(subStream);
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return true;
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}
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} // End of namespace Image
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