mirror of
https://github.com/libretro/scummvm.git
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146 lines
3.8 KiB
C++
146 lines
3.8 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "image/gif.h"
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#include "common/array.h"
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#include "common/stream.h"
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#include "common/textconsole.h"
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#include "common/util.h"
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#include "graphics/surface.h"
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#include "graphics/pixelformat.h"
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#ifdef USE_GIF
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#include <gif_lib.h>
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#endif
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namespace Image {
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GIFDecoder::GIFDecoder() : _outputSurface(0), _palette(0), _colorCount(0) {
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}
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GIFDecoder::~GIFDecoder() {
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destroy();
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}
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#ifdef USE_GIF
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static int gifReadFromStream(GifFileType *gif, GifByteType *bytes, int size) {
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Common::SeekableReadStream *stream = (Common::SeekableReadStream *)gif->UserData;
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return stream->read(bytes, size);
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}
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#endif
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bool GIFDecoder::loadStream(Common::SeekableReadStream &stream) {
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destroy();
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#ifdef USE_GIF
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int error = 0;
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GifFileType *gif = DGifOpen(&stream, gifReadFromStream, &error);
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if (!gif) {
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warning("GIF open failed with error %s", GifErrorString(error));
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return false;
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}
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const int errcode = DGifSlurp(gif);
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if (errcode != GIF_OK) {
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warning("GIF failed to load");
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DGifCloseFile(gif, 0);
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return false;
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}
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if (gif->ImageCount <= 0) {
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warning("GIF doesn't contain valid image data");
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DGifCloseFile(gif, 0);
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return false;
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}
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if (gif->ImageCount > 1) {
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warning("GIF contains more than one frame - only loading the first one");
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}
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const SavedImage *gifImage = gif->SavedImages;
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const int width = gif->SWidth;
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const int height = gif->SHeight;
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const ColorMapObject *colorMap = gif->SColorMap;
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_hasTransparentColor = false;
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for (int i = 0; i < gif->ExtensionBlockCount; ++i) {
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const ExtensionBlock &eb = gif->ExtensionBlocks[i];
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GraphicsControlBlock gcb;
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DGifExtensionToGCB(eb.ByteCount, eb.Bytes, &gcb);
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if (gcb.TransparentColor != NO_TRANSPARENT_COLOR) {
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_hasTransparentColor = true;
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_transparentColor = gcb.TransparentColor;
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break;
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}
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}
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_colorCount = colorMap->ColorCount;
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_outputSurface = new Graphics::Surface();
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_palette = new uint8[_colorCount * 3];
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const Graphics::PixelFormat format = Graphics::PixelFormat::createFormatCLUT8();
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for (int i = 0; i < _colorCount; ++i) {
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_palette[(i * 3) + 0] = colorMap->Colors[i].Red;
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_palette[(i * 3) + 1] = colorMap->Colors[i].Green;
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_palette[(i * 3) + 2] = colorMap->Colors[i].Blue;
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}
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// TODO: support transparency
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_outputSurface->create(width, height, format);
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const uint8 *in = (const uint8 *)gifImage->RasterBits;
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uint8 *pixelPtr = (uint8 *)_outputSurface->getBasePtr(0, 0);
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if (gif->Image.Interlace) {
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const int interlacedOffset[] = {0, 4, 2, 1};
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const int interlacedJumps[] = {8, 8, 4, 2};
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for (int i = 0; i < 4; ++i) {
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for (int row = interlacedOffset[i]; row < height; row += interlacedJumps[i]) {
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memcpy(pixelPtr + width * row, in, width);
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in += width;
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}
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}
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} else {
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memcpy(pixelPtr, in, width * height);
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}
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DGifCloseFile(gif, 0);
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return true;
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#else
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return false;
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#endif
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}
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void GIFDecoder::destroy() {
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if (_outputSurface) {
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_outputSurface->free();
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delete _outputSurface;
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_outputSurface = 0;
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}
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if (_palette) {
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delete[] _palette;
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_palette = 0;
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}
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}
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} // End of namespace Image
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