Initial commit

image/codecs/bmp_raw.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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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, bool ignoreAlpha, bool flip) : Codec(),
+		_width(width), _height(height), _bitsPerPixel(bitsPerPixel), _ignoreAlpha(ignoreAlpha), _flip(flip)  {
+	_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;
+	} else if (_bitsPerPixel == 4) {
+		srcPitch = (_width + 1) / 2;
+		extraDataLength = (srcPitch % 4) ? 4 - (srcPitch % 4) : 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) {
+		// flip the 8bpp images when we are decoding QTvideo
+		byte *dst = (byte *)_surface.getPixels();
+
+		for (int i = 0; i < _height; i++) {
+			stream.read(dst + (_flip ? i : _height - i - 1) * _width, _width);
+			stream.skip(extraDataLength);
+		}
+#ifndef SCUMM_LITTLE_ENDIAN
+	} else if (_bitsPerPixel == 16) {
+		byte *dst = (byte *)_surface.getBasePtr(0, _height - 1);
+
+		for (int i = 0; i < _height; i++) {
+			for (int j = 0; j < _width; j++) {
+				uint16 color = stream.readUint16LE();
+
+				*(uint16 *)dst = color;
+				dst += format.bytesPerPixel;
+			}
+
+			stream.skip(extraDataLength);
+			dst -= _surface.pitch * 2;
+		}
+#endif
+	} else {
+		byte *dst = (byte *)_surface.getBasePtr(0, _height - 1);
+		uint bpp = format.bytesPerPixel;
+
+		for (int i = 0; i < _height; i++) {
+			stream.read(dst, _width * bpp);
+			stream.skip(extraDataLength);
+			dst -= _surface.pitch;
+		}
+	}
+
+	return &_surface;
+}
+
+Graphics::PixelFormat BitmapRawDecoder::getPixelFormat() const {
+	switch (_bitsPerPixel) {
+	case 1:
+	case 4:
+	case 8:
+		return Graphics::PixelFormat::createFormatCLUT8();
+	case 16:
+		return Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0);
+	case 24:
+		return Graphics::PixelFormat::createFormatBGR24();
+	case 32:
+		return Graphics::PixelFormat::createFormatBGRA32(!_ignoreAlpha);
+	default:
+		break;
+	}
+
+	error("Unhandled BMP raw %dbpp", _bitsPerPixel);
+}
+
+} // End of namespace Image