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99 lines
2.9 KiB
C++
99 lines
2.9 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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#ifndef IMAGE_PNG_H
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#define IMAGE_PNG_H
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#include "common/scummsys.h"
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#include "common/textconsole.h"
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#include "graphics/pixelformat.h"
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#include "image/image_decoder.h"
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namespace Common {
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class SeekableReadStream;
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class WriteStream;
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}
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namespace Graphics {
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struct Surface;
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}
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namespace Image {
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/**
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* @defgroup image_png PNG decoder
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* @ingroup image
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*
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* @brief Decoder for PNG images.
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*
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* This decoder has a dependency on the libpng library.
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*
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* Used in engines:
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* - Sword25
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* - TwinE
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* - Wintermute
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* @{
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*/
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class PNGDecoder : public ImageDecoder {
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public:
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PNGDecoder();
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~PNGDecoder();
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bool loadStream(Common::SeekableReadStream &stream) override;
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void destroy() override;
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const Graphics::Surface *getSurface() const override { return _outputSurface; }
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const byte *getPalette() const override { return _palette; }
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uint16 getPaletteColorCount() const override { return _paletteColorCount; }
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bool hasTransparentColor() const override { return _hasTransparentColor; }
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uint32 getTransparentColor() const override { return _transparentColor; }
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void setSkipSignature(bool skip) { _skipSignature = skip; }
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void setKeepTransparencyPaletted(bool keep) { _keepTransparencyPaletted = keep; }
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private:
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Graphics::PixelFormat getByteOrderRgbaPixelFormat(bool isAlpha) const;
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byte *_palette;
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uint16 _paletteColorCount;
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// flag to skip the png signature check for headless png files
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bool _skipSignature;
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// Flag to keep paletted images paletted, even when the image has transparency
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bool _keepTransparencyPaletted;
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bool _hasTransparentColor;
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uint32 _transparentColor;
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Graphics::Surface *_outputSurface;
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};
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/**
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* Outputs a compressed PNG stream of the given input surface.
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*
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* @param out Stream to which to write the PNG image.
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* @param input The surface to save as a PNG image..
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* @param palette The palette (in RGB888), if the source format has a bpp of 1.
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*/
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bool writePNG(Common::WriteStream &out, const Graphics::Surface &input, const byte *palette = nullptr);
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/** @} */
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} // End of namespace Image
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#endif
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