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-rw-r--r--graphics/decoders/bmp.cpp159
1 files changed, 159 insertions, 0 deletions
diff --git a/graphics/decoders/bmp.cpp b/graphics/decoders/bmp.cpp
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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;
+}
+
+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