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GRAPHICS: Move PNG to the ImageDecoder interface
This commit is contained in:
Matthew Hoops
Johannes Schickel
parent
dd9790c1c8
commit
a658fc660e
@ -33,18 +33,19 @@
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#include "sword25/gfx/image/image.h"
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#include "sword25/gfx/image/imgloader.h"
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#include "graphics/pixelformat.h"
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#include "graphics/png.h"
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#include "graphics/decoders/png.h"
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namespace Sword25 {
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bool ImgLoader::decodePNGImage(const byte *fileDataPtr, uint fileSize, byte *&uncompressedDataPtr, int &width, int &height, int &pitch) {
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Common::MemoryReadStream *fileStr = new Common::MemoryReadStream(fileDataPtr, fileSize, DisposeAfterUse::NO);
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Graphics::PNG *png = new Graphics::PNG();
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if (!png->read(fileStr)) // the fileStr pointer, and thus pFileData will be deleted after this is done
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Graphics::PNGDecoder png;
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if (!png.loadStream(*fileStr)) // the fileStr pointer, and thus pFileData will be deleted after this is done
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error("Error while reading PNG image");
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Graphics::PixelFormat format = Graphics::PixelFormat(4, 8, 8, 8, 8, 16, 8, 0, 24);
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Graphics::Surface *pngSurface = png->getSurface(format);
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const Graphics::Surface *sourceSurface = png.getSurface();
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Graphics::Surface *pngSurface = sourceSurface->convertTo(Graphics::PixelFormat(4, 8, 8, 8, 8, 16, 8, 0, 24), png.getPalette());
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width = pngSurface->w;
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height = pngSurface->h;
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@ -53,7 +54,7 @@ bool ImgLoader::decodePNGImage(const byte *fileDataPtr, uint fileSize, byte *&un
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pngSurface->free();
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delete pngSurface;
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delete png;
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delete fileStr;
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// Signal success
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return true;
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@ -20,7 +20,7 @@
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*
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*/
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#include "graphics/png.h"
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#include "graphics/decoders/png.h"
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#include "graphics/pixelformat.h"
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#include "graphics/surface.h"
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@ -98,113 +98,27 @@ enum PNGFilters {
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kFilterPaeth = 4
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};
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PNG::PNG() : _compressedBuffer(0), _compressedBufferSize(0),
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_unfilteredSurface(0), _transparentColorSpecified(false) {
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PNGDecoder::PNGDecoder() : _compressedBuffer(0), _compressedBufferSize(0),
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_transparentColorSpecified(false), _outputSurface(0) {
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}
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PNG::~PNG() {
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if (_unfilteredSurface) {
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_unfilteredSurface->free();
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delete _unfilteredSurface;
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PNGDecoder::~PNGDecoder() {
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destroy();
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}
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void PNGDecoder::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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}
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Graphics::Surface *PNG::getSurface(const PixelFormat &format) {
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Graphics::Surface *output = new Graphics::Surface();
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output->create(_unfilteredSurface->w, _unfilteredSurface->h, format);
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byte *src = (byte *)_unfilteredSurface->pixels;
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byte a = 0xFF;
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byte bpp = _unfilteredSurface->format.bytesPerPixel;
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bool PNGDecoder::loadStream(Common::SeekableReadStream &stream) {
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destroy();
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if (_header.colorType != kIndexed) {
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if (_header.colorType == kTrueColor ||
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_header.colorType == kTrueColorWithAlpha) {
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if (bpp != 3 && bpp != 4)
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error("Unsupported truecolor PNG format");
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} else if (_header.colorType == kGrayScale ||
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_header.colorType == kGrayScaleWithAlpha) {
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if (bpp != 1 && bpp != 2)
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error("Unsupported grayscale PNG format");
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}
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for (uint16 i = 0; i < output->h; i++) {
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for (uint16 j = 0; j < output->w; j++) {
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uint32 result = 0;
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switch (bpp) {
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case 1: // Grayscale
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if (_transparentColorSpecified)
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a = (src[0] == _transparentColor[0]) ? 0 : 0xFF;
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result = format.ARGBToColor( a, src[0], src[0], src[0]);
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break;
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case 2: // Grayscale + alpha
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result = format.ARGBToColor(src[1], src[0], src[0], src[0]);
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break;
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case 3: // RGB
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if (_transparentColorSpecified) {
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bool isTransparentColor = (src[0] == _transparentColor[0] &&
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src[1] == _transparentColor[1] &&
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src[2] == _transparentColor[2]);
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a = isTransparentColor ? 0 : 0xFF;
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}
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result = format.ARGBToColor( a, src[0], src[1], src[2]);
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break;
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case 4: // RGBA
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result = format.ARGBToColor(src[3], src[0], src[1], src[2]);
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break;
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}
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if (format.bytesPerPixel == 2) // 2bpp
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*((uint16 *)output->getBasePtr(j, i)) = (uint16)result;
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else // 4bpp
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*((uint32 *)output->getBasePtr(j, i)) = result;
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src += bpp;
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}
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}
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} else {
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byte index, r, g, b;
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uint32 mask = (0xff >> (8 - _header.bitDepth)) << (8 - _header.bitDepth);
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// Convert the indexed surface to the target pixel format
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for (uint16 i = 0; i < output->h; i++) {
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int data = 0;
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int bitCount = 8;
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byte *src1 = src;
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for (uint16 j = 0; j < output->w; j++) {
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if (bitCount == 8) {
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data = *src;
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src++;
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}
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index = (data & mask) >> (8 - _header.bitDepth);
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data = (data << _header.bitDepth) & 0xff;
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bitCount -= _header.bitDepth;
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if (bitCount == 0)
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bitCount = 8;
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r = _palette[index * 4 + 0];
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g = _palette[index * 4 + 1];
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b = _palette[index * 4 + 2];
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a = _palette[index * 4 + 3];
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if (format.bytesPerPixel == 2)
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*((uint16 *)output->getBasePtr(j, i)) = format.ARGBToColor(a, r, g, b);
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else
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*((uint32 *)output->getBasePtr(j, i)) = format.ARGBToColor(a, r, g, b);
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}
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src = src1 + output->w;
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}
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}
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return output;
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}
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bool PNG::read(Common::SeekableReadStream *str) {
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uint32 chunkLength = 0, chunkType = 0;
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_stream = str;
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_stream = &stream;
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// First, check the PNG signature
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if (_stream->readUint32BE() != MKTAG(0x89, 'P', 'N', 'G')) {
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@ -249,8 +163,10 @@ bool PNG::read(Common::SeekableReadStream *str) {
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error("A palette chunk has been found in a non-indexed PNG file");
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if (chunkLength % 3 != 0)
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error("Palette chunk not divisible by 3");
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_paletteEntries = chunkLength / 3;
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readPaletteChunk();
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_stream->read(_palette, _paletteEntries * 3);
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memset(_paletteTransparency, 0xff, sizeof(_paletteTransparency));
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break;
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case kChunkIEND:
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// End of stream
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@ -269,7 +185,6 @@ bool PNG::read(Common::SeekableReadStream *str) {
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}
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// We no longer need the file stream, thus close it here
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delete _stream;
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_stream = 0;
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// Unpack the compressed buffer
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@ -295,7 +210,7 @@ bool PNG::read(Common::SeekableReadStream *str) {
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* Taken from lodePNG, with a slight patch:
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* http://www.atalasoft.com/cs/blogs/stevehawley/archive/2010/02/23/libpng-you-re-doing-it-wrong.aspx
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*/
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byte PNG::paethPredictor(int16 a, int16 b, int16 c) {
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byte PNGDecoder::paethPredictor(int16 a, int16 b, int16 c) {
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int16 pa = ABS<int16>(b - c);
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int16 pb = ABS<int16>(a - c);
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int16 pc = ABS<int16>(a + b - c - c);
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@ -315,7 +230,7 @@ byte PNG::paethPredictor(int16 a, int16 b, int16 c) {
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*
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* Taken from lodePNG
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*/
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void PNG::unfilterScanLine(byte *dest, const byte *scanLine, const byte *prevLine, uint16 byteWidth, byte filterType, uint16 length) {
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void PNGDecoder::unfilterScanLine(byte *dest, const byte *scanLine, const byte *prevLine, uint16 byteWidth, byte filterType, uint16 length) {
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uint16 i;
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switch (filterType) {
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@ -370,33 +285,29 @@ void PNG::unfilterScanLine(byte *dest, const byte *scanLine, const byte *prevLin
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}
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void PNG::constructImage() {
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int PNGDecoder::getBytesPerPixel() const {
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return (getNumColorChannels() * _header.bitDepth + 7) / 8;
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}
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void PNGDecoder::constructImage() {
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assert (_header.bitDepth != 0);
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byte *dest;
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byte *scanLine;
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byte *prevLine = 0;
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byte filterType;
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int bytesPerPixel = getBytesPerPixel();
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int pitch = bytesPerPixel * _header.width;
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byte *unfilteredSurface = new byte[pitch * _header.height];
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byte *dest = unfilteredSurface;
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uint16 scanLineWidth = (_header.width * getNumColorChannels() * _header.bitDepth + 7) / 8;
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if (_unfilteredSurface) {
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_unfilteredSurface->free();
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delete _unfilteredSurface;
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}
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_unfilteredSurface = new Graphics::Surface();
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// TODO/FIXME: It seems we can not properly determine the format here. But maybe there is a way...
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_unfilteredSurface->create(_header.width, _header.height, PixelFormat((getNumColorChannels() * _header.bitDepth + 7) / 8, 0, 0, 0, 0, 0, 0, 0, 0));
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scanLine = new byte[_unfilteredSurface->pitch];
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dest = (byte *)_unfilteredSurface->getBasePtr(0, 0);
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byte *scanLine = new byte[scanLineWidth];
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byte *prevLine = 0;
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switch(_header.interlaceType) {
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case kNonInterlaced:
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for (uint16 y = 0; y < _unfilteredSurface->h; y++) {
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filterType = _imageData->readByte();
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for (uint16 y = 0; y < _header.height; y++) {
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byte filterType = _imageData->readByte();
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_imageData->read(scanLine, scanLineWidth);
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unfilterScanLine(dest, scanLine, prevLine, _unfilteredSurface->format.bytesPerPixel, filterType, scanLineWidth);
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unfilterScanLine(dest, scanLine, prevLine, bytesPerPixel, filterType, scanLineWidth);
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prevLine = dest;
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dest += _unfilteredSurface->pitch;
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dest += pitch;
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}
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break;
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case kInterlaced:
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@ -409,9 +320,123 @@ void PNG::constructImage() {
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}
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delete[] scanLine;
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constructOutput(unfilteredSurface);
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delete[] unfilteredSurface;
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}
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void PNG::readHeaderChunk() {
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Graphics::PixelFormat PNGDecoder::findPixelFormat() const {
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// Try to find the best pixel format based on what we have here
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// Which is basically 8bpp for paletted non-transparent
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// and 32bpp for everything else
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switch (_header.colorType) {
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case kIndexed:
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if (!_transparentColorSpecified)
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return Graphics::PixelFormat::createFormatCLUT8();
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// fall through
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case kGrayScale:
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case kTrueColor:
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case kGrayScaleWithAlpha:
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case kTrueColorWithAlpha:
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// We'll go with standard RGBA 32-bit
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return Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0);
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}
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error("Unknown PNG color type");
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return Graphics::PixelFormat();
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}
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void PNGDecoder::constructOutput(const byte *surface) {
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_outputSurface = new Graphics::Surface();
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_outputSurface->create(_header.width, _header.height, findPixelFormat());
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const byte *src = surface;
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byte a = 0xFF;
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int bytesPerPixel = getBytesPerPixel();
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if (_header.colorType != kIndexed) {
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if (_header.colorType == kTrueColor ||
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_header.colorType == kTrueColorWithAlpha) {
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if (bytesPerPixel != 3 && bytesPerPixel != 4)
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error("Unsupported truecolor PNG format");
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} else if (_header.colorType == kGrayScale ||
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_header.colorType == kGrayScaleWithAlpha) {
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if (bytesPerPixel != 1 && bytesPerPixel != 2)
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error("Unsupported grayscale PNG format");
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}
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for (uint16 i = 0; i < _outputSurface->h; i++) {
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for (uint16 j = 0; j < _outputSurface->w; j++) {
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uint32 result = 0;
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switch (bytesPerPixel) {
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case 1: // Grayscale
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if (_transparentColorSpecified)
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a = (src[0] == _transparentColor[0]) ? 0 : 0xFF;
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result = _outputSurface->format.ARGBToColor(a, src[0], src[0], src[0]);
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break;
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case 2: // Grayscale + alpha
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result = _outputSurface->format.ARGBToColor(src[1], src[0], src[0], src[0]);
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break;
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case 3: // RGB
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if (_transparentColorSpecified) {
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bool isTransparentColor = (src[0] == _transparentColor[0] &&
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src[1] == _transparentColor[1] &&
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src[2] == _transparentColor[2]);
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a = isTransparentColor ? 0 : 0xFF;
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}
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result = _outputSurface->format.ARGBToColor(a, src[0], src[1], src[2]);
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break;
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case 4: // RGBA
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result = _outputSurface->format.ARGBToColor(src[3], src[0], src[1], src[2]);
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break;
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}
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*((uint32 *)_outputSurface->getBasePtr(j, i)) = result;
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src += bytesPerPixel;
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}
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}
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} else {
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uint32 mask = (0xff >> (8 - _header.bitDepth)) << (8 - _header.bitDepth);
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// Convert the indexed surface to the target pixel format
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for (uint16 i = 0; i < _outputSurface->h; i++) {
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int data = 0;
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int bitCount = 8;
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const byte *src1 = src;
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for (uint16 j = 0; j < _outputSurface->w; j++) {
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if (bitCount == 8) {
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data = *src;
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src++;
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}
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byte index = (data & mask) >> (8 - _header.bitDepth);
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data = (data << _header.bitDepth) & 0xff;
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bitCount -= _header.bitDepth;
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if (bitCount == 0)
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bitCount = 8;
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if (_transparentColorSpecified) {
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byte r = _palette[index * 3 + 0];
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byte g = _palette[index * 3 + 1];
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byte b = _palette[index * 3 + 2];
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a = _paletteTransparency[index];
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*((uint32 *)_outputSurface->getBasePtr(j, i)) = _outputSurface->format.ARGBToColor(a, r, g, b);
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} else {
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*((byte *)_outputSurface->getBasePtr(j, i)) = index;
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}
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}
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src = src1 + _outputSurface->w;
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}
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}
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}
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void PNGDecoder::readHeaderChunk() {
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_header.width = _stream->readUint32BE();
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_header.height = _stream->readUint32BE();
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_header.bitDepth = _stream->readByte();
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@ -431,7 +456,7 @@ void PNG::readHeaderChunk() {
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_header.interlaceType = (PNGInterlaceType)_stream->readByte();
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}
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byte PNG::getNumColorChannels() {
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byte PNGDecoder::getNumColorChannels() const {
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switch (_header.colorType) {
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case kGrayScale:
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return 1; // Gray
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@ -448,16 +473,7 @@ byte PNG::getNumColorChannels() {
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}
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}
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void PNG::readPaletteChunk() {
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for (uint16 i = 0; i < _paletteEntries; i++) {
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_palette[i * 4 + 0] = _stream->readByte(); // R
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_palette[i * 4 + 1] = _stream->readByte(); // G
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_palette[i * 4 + 2] = _stream->readByte(); // B
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_palette[i * 4 + 3] = 0xFF; // Alpha, set in the tRNS chunk
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}
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}
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void PNG::readTransparencyChunk(uint32 chunkLength) {
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void PNGDecoder::readTransparencyChunk(uint32 chunkLength) {
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_transparentColorSpecified = true;
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switch(_header.colorType) {
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@ -472,8 +488,8 @@ void PNG::readTransparencyChunk(uint32 chunkLength) {
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_transparentColor[2] = _stream->readUint16BE();
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break;
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case kIndexed:
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for (uint32 i = 0; i < chunkLength; i++)
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_palette[i * 4 + 3] = _stream->readByte();
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_stream->read(_paletteTransparency, chunkLength);
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// A transparency chunk may have less entries
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// than the palette entries. The remaining ones
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// are unmodified (set to 255). Check here:
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@ -53,6 +53,7 @@
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#include "common/scummsys.h"
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#include "common/textconsole.h"
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#include "graphics/decoders/image_decoder.h"
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namespace Common {
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class SeekableReadStream;
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@ -61,82 +62,44 @@ class SeekableReadStream;
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namespace Graphics {
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struct Surface;
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enum PNGColorType {
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kGrayScale = 0, // bit depths: 1, 2, 4, 8, 16
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kTrueColor = 2, // bit depths: 8, 16
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kIndexed = 3, // bit depths: 1, 2, 4, 8
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kGrayScaleWithAlpha = 4, // bit depths: 8, 16
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kTrueColorWithAlpha = 6 // bit depths: 8, 16
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};
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enum PNGInterlaceType {
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kNonInterlaced = 0,
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kInterlaced = 1
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};
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struct PNGHeader {
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uint32 width;
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uint32 height;
|
||||
byte bitDepth;
|
||||
PNGColorType colorType;
|
||||
byte compressionMethod;
|
||||
byte filterMethod;
|
||||
PNGInterlaceType interlaceType;
|
||||
};
|
||||
|
||||
struct PixelFormat;
|
||||
|
||||
class PNG {
|
||||
class PNGDecoder : public ImageDecoder {
|
||||
public:
|
||||
PNG();
|
||||
~PNG();
|
||||
PNGDecoder();
|
||||
~PNGDecoder();
|
||||
|
||||
/**
|
||||
* Reads a PNG image from the specified stream
|
||||
*/
|
||||
bool read(Common::SeekableReadStream *str);
|
||||
|
||||
/**
|
||||
* Returns the information obtained from the PNG header.
|
||||
*/
|
||||
PNGHeader getHeader() const { return _header; }
|
||||
|
||||
/**
|
||||
* Returns the PNG image, formatted for the specified pixel format.
|
||||
*/
|
||||
Graphics::Surface *getSurface(const PixelFormat &format);
|
||||
|
||||
/**
|
||||
* Returns the indexed PNG8 image. Used for PNGs with an indexed 256 color
|
||||
* palette, when they're shown on an 8-bit color screen, as no translation
|
||||
* is taking place.
|
||||
*/
|
||||
Graphics::Surface *getIndexedSurface() {
|
||||
if (_header.colorType != kIndexed)
|
||||
error("Indexed surface requested for a non-indexed PNG");
|
||||
return _unfilteredSurface;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the palette of the specified PNG8 image, given a pointer to
|
||||
* an RGBA palette array (4 x 256).
|
||||
*/
|
||||
void getPalette(byte *palette, uint16 &entries) {
|
||||
if (_header.colorType != kIndexed)
|
||||
error("Palette requested for a non-indexed PNG");
|
||||
for (int i = 0; i < 256; i++) {
|
||||
palette[0 + i * 4] = _palette[0 + i * 4]; // R
|
||||
palette[1 + i * 4] = _palette[1 + i * 4]; // G
|
||||
palette[2 + i * 4] = _palette[2 + i * 4]; // B
|
||||
palette[3 + i * 4] = _palette[3 + i * 4]; // A
|
||||
}
|
||||
entries = _paletteEntries;
|
||||
}
|
||||
bool loadStream(Common::SeekableReadStream &stream);
|
||||
void destroy();
|
||||
const Graphics::Surface *getSurface() const { return _outputSurface; }
|
||||
const byte *getPalette() const { return _palette; }
|
||||
|
||||
private:
|
||||
enum PNGColorType {
|
||||
kGrayScale = 0, // bit depths: 1, 2, 4, 8, 16
|
||||
kTrueColor = 2, // bit depths: 8, 16
|
||||
kIndexed = 3, // bit depths: 1, 2, 4, 8
|
||||
kGrayScaleWithAlpha = 4, // bit depths: 8, 16
|
||||
kTrueColorWithAlpha = 6 // bit depths: 8, 16
|
||||
};
|
||||
|
||||
enum PNGInterlaceType {
|
||||
kNonInterlaced = 0,
|
||||
kInterlaced = 1
|
||||
};
|
||||
|
||||
struct PNGHeader {
|
||||
uint32 width;
|
||||
uint32 height;
|
||||
byte bitDepth;
|
||||
PNGColorType colorType;
|
||||
byte compressionMethod;
|
||||
byte filterMethod;
|
||||
PNGInterlaceType interlaceType;
|
||||
};
|
||||
|
||||
void readHeaderChunk();
|
||||
byte getNumColorChannels();
|
||||
byte getNumColorChannels() const;
|
||||
|
||||
void readPaletteChunk();
|
||||
void readTransparencyChunk(uint32 chunkLength);
|
||||
@ -152,7 +115,8 @@ private:
|
||||
|
||||
PNGHeader _header;
|
||||
|
||||
byte _palette[256 * 4]; // RGBA
|
||||
byte _palette[256 * 3]; // RGB
|
||||
byte _paletteTransparency[256];
|
||||
uint16 _paletteEntries;
|
||||
uint16 _transparentColor[3];
|
||||
bool _transparentColorSpecified;
|
||||
@ -160,9 +124,12 @@ private:
|
||||
byte *_compressedBuffer;
|
||||
uint32 _compressedBufferSize;
|
||||
|
||||
Graphics::Surface *_unfilteredSurface;
|
||||
Graphics::Surface *_outputSurface;
|
||||
Graphics::PixelFormat findPixelFormat() const;
|
||||
int getBytesPerPixel() const;
|
||||
void constructOutput(const byte *surface);
|
||||
};
|
||||
|
||||
} // End of Graphics namespace
|
||||
} // End of namespace Graphics
|
||||
|
||||
#endif // GRAPHICS_PNG_H
|
||||
@ -13,7 +13,6 @@ MODULE_OBJS := \
|
||||
fonts/winfont.o \
|
||||
iff.o \
|
||||
maccursor.o \
|
||||
png.o \
|
||||
primitives.o \
|
||||
scaler.o \
|
||||
scaler/thumbnail_intern.o \
|
||||
@ -26,7 +25,8 @@ MODULE_OBJS := \
|
||||
yuv_to_rgb.o \
|
||||
decoders/bmp.o \
|
||||
decoders/jpeg.o \
|
||||
decoders/pict.o
|
||||
decoders/pict.o \
|
||||
decoders/png.o
|
||||
|
||||
ifdef USE_SCALERS
|
||||
MODULE_OBJS += \
|
||||
|
||||
Loading…
Reference in New Issue
Block a user