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Diffstat (limited to 'graphics/decoders/bmp.cpp')
| -rw-r--r-- | graphics/decoders/bmp.cpp | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/graphics/decoders/bmp.cpp b/graphics/decoders/bmp.cpp new file mode 100644 index 0000000000..0d44881d7c --- /dev/null +++ b/graphics/decoders/bmp.cpp @@ -0,0 +1,159 @@ +/* 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; +} + +BitmapDecoder::~BitmapDecoder() { + destroy(); +} + +void BitmapDecoder::destroy() { + if (_surface) { + _surface->free(); + delete _surface; _surface = 0; + } + + delete[] _palette; _palette = 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) { + 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(); + uint32 colorsUsed = stream.readUint32LE(); + /* uint32 colorsImportant = */ stream.readUint32LE(); + + if (colorsUsed == 0) + colorsUsed = 256; + + if (bitsPerPixel == 8) { + // Read the palette + _palette = new byte[colorsUsed * 3]; + for (uint16 i = 0; i < colorsUsed; 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 + if (bitsPerPixel == 24) + 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 { + 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; + } + } + + return true; +} + +} // End of namespace Graphics |