/* * qxcfi.cpp: A Qt 3 plug-in for reading GIMP XCF image files * Copyright (C) 2001 lignum Computing, Inc. * $Id: qxcfi.cpp 531593 2006-04-19 15:46:52Z gateau $ * * This plug-in is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include "qxcfi.h" // Change a QRgb value's alpha only. (an optimization) inline QRgb qRgba ( QRgb rgb, int a ) { return ( ( a & 0xff ) << 24 | ( rgb & RGB_MASK ) ); } namespace Gwenview { int SafeDataStream::at() const { return mDevice->at(); } const float INCHESPERMETER = (100. / 2.54); // Static global values int XCFImageFormat::random_table[RANDOM_TABLE_SIZE]; int XCFImageFormat::add_lut[256][256]; XCFImageFormat::LayerModes XCFImageFormat::layer_modes[] = { { true }, // NORMAL_MODE { true }, // DISSOLVE_MODE { true }, // BEHIND_MODE { false }, // MULTIPLY_MODE { false }, // SCREEN_MODE { false }, // OVERLAY_MODE { false }, // DIFFERENCE_MODE { false }, // ADDITION_MODE { false }, // SUBTRACT_MODE { false }, // DARKEN_ONLY_MODE { false }, // LIGHTEN_ONLY_MODE { false }, // HUE_MODE { false }, // SATURATION_MODE { false }, // COLOR_MODE { false }, // VALUE_MODE { false }, // DIVIDE_MODE { true }, // ERASE_MODE { true }, // REPLACE_MODE { true }, // ANTI_ERASE_MODE }; ////////////////////////////////////////////////////////////////////////////////// // From GIMP "paint_funcs.c" v1.2 /*! * Multiply two color components. Really expects the arguments to be * 8-bit quantities. * \param a first minuend. * \param b second minuend. * \return product of arguments. */ inline int INT_MULT ( int a, int b ) { int c = a * b + 0x80; return ( ( c >> 8 ) + c ) >> 8; } /*! * Blend the two color components in the proportion alpha: * * result = alpha a + ( 1 - alpha b) * * \param a first component. * \param b second component. * \param alpha blend proportion. * \return blended color components. */ inline int INT_BLEND ( int a, int b, int alpha ) { return INT_MULT( a - b, alpha ) + b; } // Actually from GLIB inline int MIN ( int a, int b ) { return ( a < b ? a : b ); } inline int MAX ( int a, int b ) { return ( a > b ? a : b ); } // From GIMP "gimpcolorspace.c" v1.2 /*! * Convert a color in RGB space to HSV space (Hue, Saturation, Value). * \param red the red component (modified in place). * \param green the green component (modified in place). * \param blue the blue component (modified in place). */ void RGBTOHSV ( uchar& red, uchar& green, uchar& blue ) { int r, g, b; double h, s, v; int min, max; h = 0.; r = red; g = green; b = blue; if ( r > g ) { max = MAX( r, b ); min = MIN( g, b ); } else { max = MAX( g, b ); min = MIN( r, b ); } v = max; if ( max != 0 ) s = ( ( max - min ) * 255 ) / (double)max; else s = 0; if ( s == 0 ) h = 0; else { int delta = max - min; if ( r == max ) h = ( g - b ) / (double)delta; else if ( g == max ) h = 2 + ( b - r ) / (double)delta; else if ( b == max ) h = 4 + ( r - g ) / (double)delta; h *= 42.5; if ( h < 0 ) h += 255; if ( h > 255 ) h -= 255; } red = (uchar)h; green = (uchar)s; blue = (uchar)v; } /*! * Convert a color in HSV space to RGB space. * \param hue the hue component (modified in place). * \param saturation the saturation component (modified in place). * \param value the value component (modified in place). */ void HSVTORGB ( uchar& hue, uchar& saturation, uchar& value ) { if ( saturation == 0 ) { hue = value; saturation = value; value = value; } else { double h = hue * 6. / 255.; double s = saturation / 255.; double v = value / 255.; double f = h - (int)h; double p = v * ( 1. - s ); double q = v * ( 1. - ( s * f ) ); double t = v * ( 1. - ( s * ( 1. - f ) ) ); // Worth a note here that gcc 2.96 will generate different results // depending on optimization mode on i386. switch ((int)h) { case 0: hue = (uchar)( v * 255 ); saturation = (uchar)( t * 255 ); value = (uchar)( p * 255 ); break; case 1: hue = (uchar)( q * 255 ); saturation = (uchar)( v * 255 ); value = (uchar)( p * 255 ); break; case 2: hue = (uchar)( p * 255 ); saturation = (uchar)( v * 255 ); value = (uchar)( t * 255 ); break; case 3: hue = (uchar)( p * 255 ); saturation = (uchar)( q * 255 ); value = (uchar)( v * 255 ); break; case 4: hue = (uchar)( t * 255 ); saturation = (uchar)( p * 255 ); value = (uchar)( v * 255 ); break; case 5: hue = (uchar)( v * 255 ); saturation = (uchar)( p * 255 ); value = (uchar)( q * 255 ); } } } /*! * Convert a color in RGB space to HLS space (Hue, Lightness, Saturation). * \param red the red component (modified in place). * \param green the green component (modified in place). * \param blue the blue component (modified in place). */ void RGBTOHLS ( uchar& red, uchar& green, uchar& blue ) { int r = red; int g = green; int b = blue; int min, max; if ( r > g ) { max = MAX( r, b ); min = MIN( g, b ); } else { max = MAX( g, b ); min = MIN( r, b ); } double h; double l = ( max + min ) / 2.; double s; if ( max == min ) { s = 0.; h = 0.; } else { int delta = max - min; if ( l < 128 ) s = 255 * (double)delta / (double)( max + min ); else s = 255 * (double)delta / (double)( 511 - max - min ); if ( r == max ) h = ( g - b ) / (double)delta; else if ( g == max ) h = 2 + ( b - r ) / (double)delta; else h = 4 + ( r - g ) / (double)delta; h *= 42.5; if ( h < 0 ) h += 255; else if ( h > 255 ) h -= 255; } red = (uchar)h; green = (uchar)l; blue = (uchar)s; } /*! * Implement the HLS "double hex-cone". * \param n1 lightness fraction (?) * \param n2 saturation fraction (?) * \param hue hue "angle". * \return HLS value. */ int HLSVALUE ( double n1, double n2, double hue ) { double value; if ( hue > 255 ) hue -= 255; else if ( hue < 0 ) hue += 255; if ( hue < 42.5 ) value = n1 + ( n2 - n1 ) * ( hue / 42.5 ); else if ( hue < 127.5 ) value = n2; else if ( hue < 170 ) value = n1 + ( n2 - n1 ) * ( ( 170 - hue ) / 42.5 ); else value = n1; return (int)( value * 255 ); } /*! * Convert a color in HLS space to RGB space. * \param hue the hue component (modified in place). * \param lightness the lightness component (modified in place). * \param saturation the saturation component (modified in place). */ void HLSTORGB ( uchar& hue, uchar& lightness, uchar& saturation ) { double h = hue; double l = lightness; double s = saturation; if ( s == 0 ) { hue = (uchar)l; lightness = (uchar)l; saturation = (uchar)l; } else { double m1, m2; if ( l < 128 ) m2 = ( l * ( 255 + s ) ) / 65025.; else m2 = ( l + s - ( l * s ) / 255. ) / 255.; m1 = ( l / 127.5 ) - m2; hue = HLSVALUE( m1, m2, h + 85 ); lightness = HLSVALUE( m1, m2, h ); saturation = HLSVALUE( m1, m2, h - 85 ); } } ////////////////////////////////////////////////////////////////////////////////// XCFImageFormat::XCFImageFormat() { // From GIMP "paint_funcs.c" v1.2 srand( RANDOM_SEED ); for ( int i = 0; i < RANDOM_TABLE_SIZE; i++ ) random_table[i] = rand(); for ( int i = 0; i < RANDOM_TABLE_SIZE; i++ ) { int tmp; int swap = i + rand() % ( RANDOM_TABLE_SIZE - i ); tmp = random_table[i]; random_table[i] = random_table[swap]; random_table[swap] = tmp; } for ( int j = 0; j < 256; j++ ) { for ( int k = 0; k < 256; k++ ) { int tmp_sum = j + k; if ( tmp_sum > 255 ) tmp_sum = 255; add_lut[j][k] = tmp_sum; } } } bool XCFImageFormat::installIOHandler ( const QString& ) { QImageIO::defineIOHandler( "XCF", "gimp xcf", 0, &XCFImageFormat::readXCF, #ifdef TMP_WRITE &XCFImageFormat::writeXCF ); #else 0 ); #endif return true; } void XCFImageFormat::registerFormat() { QImageIO::defineIOHandler( "XCF","^gimp xcf", 0,XCFImageFormat::readXCF,0L); } /*! * The Qt QImageIO architecture invokes this routine to read the image. * The file (or other data stream) is already open and the * initial string indicating a XCF file has been matched (but the stream * is positioned at its beginning). * * The XCF file is binary and is stored in big endian format. The * SafeDataStream class is used to read the file. Even though the XCF file * was not written with SafeDataStream, there is still a good match. At least * in version 001 of XCF and version 4 of SafeDataStream. Any other combination * is suspect. * * Any failures while reading the XCF image are reported by the * QImage::status() method. * * \param image_io the QImageIO object connected to the XCF image. */ void XCFImageFormat::readXCF ( QImageIO* image_io ) { XCFImage xcf_image; // The XCF data is stored in big endian format, which SafeDataStream handles // very well. SafeDataStream xcf_io( image_io->ioDevice() ); char tag[14]; xcf_io.readRawBytes( tag, sizeof(tag) ); if ( xcf_io.failed() ) { qDebug( "XCF: read failure on header tag" ); return; } xcf_io >> xcf_image.width >> xcf_image.height >> xcf_image.type; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on image info" ); return; } if ( !loadImageProperties( xcf_io, xcf_image ) ) return; // The layers appear to be stored in top-to-bottom order. This is // the reverse of how a merged image must be computed. So, the layer // offsets are pushed onto a LIFO stack (thus, we don't have to load // all the data of all layers before beginning to construct the // merged image). QValueStack< Q_INT32 > layer_offsets; while ( true ) { Q_INT32 layer_offset; xcf_io >> layer_offset; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer offsets" ); return; } if ( layer_offset == 0 ) break; layer_offsets.push( layer_offset ); } xcf_image.num_layers = layer_offsets.size(); if ( layer_offsets.size() == 0 ) { qDebug( "XCF: no layers!" ); return; } // Load each layer and add it to the image while ( !layer_offsets.isEmpty() ) { Q_INT32 layer_offset = layer_offsets.pop(); xcf_io.device()->at( layer_offset ); if ( !loadLayer( xcf_io, xcf_image ) ) return; } if ( !xcf_image.initialized ) { qDebug( "XCF: no visible layers!" ); return; } image_io->setImage( xcf_image.image ); image_io->setStatus( 0 ); } /*! * Construct the QImage which will eventually be returned to the QImage * loader. * * There are a couple of situations which require that the QImage is not * exactly the same as The GIMP's representation. The full table is: * \verbatim * Grayscale opaque : 8 bpp indexed * Grayscale translucent : 32 bpp + alpha * Indexed opaque : 1 bpp if num_colors <= 2 * : 8 bpp indexed otherwise * Indexed translucent : 8 bpp indexed + alpha if num_colors < 256 * : 32 bpp + alpha otherwise * RGB opaque : 32 bpp * RGBA translucent : 32 bpp + alpha * \endverbatim * Whether the image is translucent or not is determined by the bottom layer's * alpha channel. However, even if the bottom layer lacks an alpha channel, * it can still have an opacity < 1. In this case, the QImage is promoted * to 32-bit. (Note this is different from the output from the GIMP image * exporter, which seems to ignore this attribute.) * * Independently, higher layers can be translucent, but the background of * the image will not show through if the bottom layer is opaque. * * For indexed images, translucency is an all or nothing effect. * \param xcf_image contains image info and bottom-most layer. */ void XCFImageFormat::initializeImage ( XCFImage& xcf_image ) { // (Aliases to make the code look a little better.) Layer& layer( xcf_image.layer ); QImage& image( xcf_image.image ); switch ( layer.type ) { case RGB_GIMAGE: if ( layer.opacity == OPAQUE_OPACITY ) { image.create( xcf_image.width, xcf_image.height, 32 ); image.fill( qRgb( 255, 255, 255 ) ); break; } // else, fall through to 32-bit representation case RGBA_GIMAGE: image.create( xcf_image.width, xcf_image.height, 32 ); image.fill( qRgba( 255, 255, 255, 0 ) ); // Turning this on prevents fill() from affecting the alpha channel, // by the way. image.setAlphaBuffer( true ); break; case GRAY_GIMAGE: if ( layer.opacity == OPAQUE_OPACITY ) { image.create( xcf_image.width, xcf_image.height, 8, 256 ); setGrayPalette( image ); image.fill( 255 ); break; } // else, fall through to 32-bit representation case GRAYA_GIMAGE: image.create( xcf_image.width, xcf_image.height, 32 ); image.fill( qRgba( 255, 255, 255, 0 ) ); image.setAlphaBuffer( true ); break; case INDEXED_GIMAGE: // As noted in the table above, there are quite a few combinations // which are possible with indexed images, depending on the // presence of transparency (note: not translucency, which is not // supported by The GIMP for indexed images) and the number of // individual colors. // Note: Qt treats a bitmap with a Black and White color palette // as a mask, so only the "on" bits are drawn, regardless of the // order color table entries. Otherwise (i.e., at least one of the // color table entries is not black or white), it obeys the one- // or two-color palette. Have to ask about this... if ( xcf_image.num_colors <= 2 ) { image.create( xcf_image.width, xcf_image.height, 1, xcf_image.num_colors, QImage::LittleEndian ); image.fill( 0 ); setPalette( xcf_image, image ); } else if ( xcf_image.num_colors <= 256 ) { image.create( xcf_image.width, xcf_image.height, 8, xcf_image.num_colors, QImage::LittleEndian ); image.fill( 0 ); setPalette( xcf_image, image ); } break; case INDEXEDA_GIMAGE: if ( xcf_image.num_colors == 1 ) { // Plenty(!) of room to add a transparent color xcf_image.num_colors++; xcf_image.palette.resize( xcf_image.num_colors ); xcf_image.palette[1] = xcf_image.palette[0]; xcf_image.palette[0] = qRgba( 255, 255, 255, 0 ); image.create( xcf_image.width, xcf_image.height, 1, xcf_image.num_colors, QImage::LittleEndian ); image.fill( 0 ); setPalette( xcf_image, image ); image.setAlphaBuffer( true ); } else if ( xcf_image.num_colors < 256 ) { // Plenty of room to add a transparent color xcf_image.num_colors++; xcf_image.palette.resize( xcf_image.num_colors ); for ( int c = xcf_image.num_colors-1; c >= 1; c-- ) xcf_image.palette[c] = xcf_image.palette[c-1]; xcf_image.palette[0] = qRgba( 255, 255, 255, 0 ); image.create( xcf_image.width, xcf_image.height, 8, xcf_image.num_colors ); image.fill( 0 ); setPalette( xcf_image, image ); image.setAlphaBuffer( true ); } else { // No room for a transparent color, so this has to be promoted to // true color. (There is no equivalent PNG representation output // from The GIMP as of v1.2.) image.create( xcf_image.width, xcf_image.height, 32 ); image.fill( qRgba( 255, 255, 255, 0 ) ); image.setAlphaBuffer( true ); } break; } image.setDotsPerMeterX( (int)( xcf_image.x_resolution * INCHESPERMETER ) ); image.setDotsPerMeterY( (int)( xcf_image.y_resolution * INCHESPERMETER ) ); } /*! * Compute the number of tiles in the current layer and allocate * QImage structures for each of them. * \param xcf_image contains the current layer. */ void XCFImageFormat::composeTiles ( XCFImage& xcf_image ) { Layer& layer( xcf_image.layer ); layer.nrows = ( layer.height + TILE_HEIGHT - 1 ) / TILE_HEIGHT; layer.ncols = ( layer.width + TILE_WIDTH - 1 ) / TILE_WIDTH; layer.image_tiles.resize( layer.nrows ); if ( layer.type == GRAYA_GIMAGE || layer.type == INDEXEDA_GIMAGE ) layer.alpha_tiles.resize( layer.nrows ); if ( layer.mask_offset != 0 ) layer.mask_tiles.resize( layer.nrows ); for ( uint j = 0; j < layer.nrows; j++ ) { layer.image_tiles[j].resize( layer.ncols ); if ( layer.type == GRAYA_GIMAGE || layer.type == INDEXEDA_GIMAGE ) layer.alpha_tiles[j].resize( layer.ncols ); if ( layer.mask_offset != 0 ) layer.mask_tiles[j].resize( layer.ncols ); } for ( uint j = 0; j < layer.nrows; j++ ) { for ( uint i = 0; i < layer.ncols; i++ ) { uint tile_width = (i+1) * TILE_WIDTH <= layer.width ? TILE_WIDTH : layer.width - i*TILE_WIDTH; uint tile_height = (j+1) * TILE_HEIGHT <= layer.height ? TILE_HEIGHT : layer.height - j*TILE_HEIGHT; // Try to create the most appropriate QImage (each GIMP layer // type is treated slightly differently) switch ( layer.type ) { case RGB_GIMAGE: layer.image_tiles[j][i] = QImage( tile_width, tile_height, 32, 0 ); layer.image_tiles[j][i].setAlphaBuffer( false ); break; case RGBA_GIMAGE: layer.image_tiles[j][i] = QImage( tile_width, tile_height, 32, 0 ); layer.image_tiles[j][i].setAlphaBuffer( true ); break; case GRAY_GIMAGE: layer.image_tiles[j][i] = QImage( tile_width, tile_height, 8, 256 ); setGrayPalette( layer.image_tiles[j][i] ); break; case GRAYA_GIMAGE: layer.image_tiles[j][i] = QImage( tile_width, tile_height, 8, 256 ); setGrayPalette( layer.image_tiles[j][i] ); layer.alpha_tiles[j][i] = QImage( tile_width, tile_height, 8, 256 ); setGrayPalette( layer.alpha_tiles[j][i] ); break; case INDEXED_GIMAGE: layer.image_tiles[j][i] = QImage( tile_width, tile_height, 8, xcf_image.num_colors ); setPalette( xcf_image, layer.image_tiles[j][i] ); break; case INDEXEDA_GIMAGE: layer.image_tiles[j][i] = QImage( tile_width, tile_height, 8, xcf_image.num_colors ); setPalette( xcf_image, layer.image_tiles[j][i] ); layer.alpha_tiles[j][i] = QImage( tile_width, tile_height, 8, 256 ); setGrayPalette( layer.alpha_tiles[j][i] ); } if ( layer.mask_offset != 0 ) { layer.mask_tiles[j][i] = QImage( tile_width, tile_height, 8, 256 ); setGrayPalette( layer.mask_tiles[j][i] ); } } } } /*! * Apply a grayscale palette to the QImage. Note that Qt does not distinguish * between grayscale and indexed images. A grayscale image is just * an indexed image with a 256-color, grayscale palette. * \param image image to set to a grayscale palette. */ void XCFImageFormat::setGrayPalette ( QImage& image ) { for ( int i = 0; i < 256; i++ ) image.setColor( i, qRgb(i,i,i) ); } /*! * Copy the indexed palette from the XCF image into the QImage. * \param xcf_image XCF image containing the palette read from the data stream. * \param image image to apply the palette to. */ void XCFImageFormat::setPalette ( XCFImage& xcf_image, QImage& image ) { for ( int i = 0; i < xcf_image.num_colors; i++ ) image.setColor( i, xcf_image.palette[i] ); } /*! * An XCF file can contain an arbitrary number of properties associated * with the image (and layer and mask). * \param xcf_io the data stream connected to the XCF image * \param xcf_image XCF image data. * \return true if there were no I/O errors. */ bool XCFImageFormat::loadImageProperties ( SafeDataStream& xcf_io, XCFImage& xcf_image ) { while ( true ) { PropType type; QByteArray bytes; if ( !loadProperty( xcf_io, type, bytes ) ) { qDebug( "XCF: error loading global image properties" ); return false; } QDataStream property( bytes, IO_ReadOnly ); switch ( type ) { case PROP_END: return true; case PROP_COMPRESSION: property >> xcf_image.compression; break; case PROP_GUIDES: // This property is ignored. break; case PROP_RESOLUTION: property >> xcf_image.x_resolution >> xcf_image.y_resolution; break; case PROP_TATTOO: property >> xcf_image.tattoo; break; case PROP_PARASITES: while ( !property.atEnd() ) { char* tag; Q_UINT32 size; property.readBytes( tag, size ); Q_UINT32 flags; char* data; property >> flags >> data; if ( strcmp( tag, "gimp-comment" ) == 0 ) xcf_image.image.setText( "Comment", 0, data ); delete[] tag; delete[] data; } break; case PROP_UNIT: property >> xcf_image.unit; break; case PROP_PATHS: // This property is ignored. break; case PROP_USER_UNIT: // This property is ignored. break; case PROP_COLORMAP: property >> xcf_image.num_colors; xcf_image.palette.reserve( xcf_image.num_colors ); for ( int i = 0; i < xcf_image.num_colors; i++ ) { uchar r, g, b; property >> r >> g >> b; xcf_image.palette.push_back( qRgb(r,g,b) ); } break; default: qDebug( "XCF: unimplemented image property %d, size %d", type, bytes.size() ); } } } /*! * Load a layer from the XCF file. The data stream must be positioned at * the beginning of the layer data. * \param xcf_io the image file data stream. * \param xcf_image contains the layer and the color table * (if the image is indexed). * \return true if there were no I/O errors. */ bool XCFImageFormat::loadLayer ( SafeDataStream& xcf_io, XCFImage& xcf_image ) { Layer& layer( xcf_image.layer ); if ( layer.name != 0 ) delete[] layer.name; xcf_io >> layer.width >> layer.height >> layer.type >> layer.name; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer" ); return false; } if ( !loadLayerProperties( xcf_io, layer ) ) return false; #if 0 cout << "layer: \"" << layer.name << "\", size: " << layer.width << " x " << layer.height << ", type: " << layer.type << ", mode: " << layer.mode << ", opacity: " << layer.opacity << ", visible: " << layer.visible << ", offset: " << layer.x_offset << ", " << layer.y_offset << endl; #endif // Skip reading the rest of it if it is not visible. Typically, when // you export an image from the The GIMP it flattens (or merges) only // the visible layers into the output image. if ( layer.visible == 0 ) return true; // If there are any more layers, merge them into the final QImage. xcf_io >> layer.hierarchy_offset >> layer.mask_offset; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer image offsets" ); return false; } // Allocate the individual tile QImages based on the size and type // of this layer. composeTiles( xcf_image ); xcf_io.device()->at( layer.hierarchy_offset ); // As tiles are loaded, they are copied into the layers tiles by // this routine. (loadMask(), below, uses a slightly different // version of assignBytes().) layer.assignBytes = assignImageBytes; if ( !loadHierarchy( xcf_io, layer ) ) return false; if ( layer.mask_offset != 0 ) { xcf_io.device()->at( layer.mask_offset ); if ( !loadMask( xcf_io, layer ) ) return false; } // Now we should have enough information to initialize the final // QImage. The first visible layer determines the attributes // of the QImage. if ( !xcf_image.initialized ) { initializeImage( xcf_image ); copyLayerToImage( xcf_image ); xcf_image.initialized = true; } else mergeLayerIntoImage( xcf_image ); return true; } /*! * An XCF file can contain an arbitrary number of properties associated * with a layer. * \param xcf_io the data stream connected to the XCF image. * \param layer layer to collect the properties. * \return true if there were no I/O errors. */ bool XCFImageFormat::loadLayerProperties ( SafeDataStream& xcf_io, Layer& layer ) { while ( true ) { PropType type; QByteArray bytes; if ( !loadProperty( xcf_io, type, bytes ) ) { qDebug( "XCF: error loading layer properties" ); return false; } QDataStream property( bytes, IO_ReadOnly ); switch ( type ) { case PROP_END: return true; case PROP_ACTIVE_LAYER: layer.active = true; break; case PROP_OPACITY: property >> layer.opacity; break; case PROP_VISIBLE: property >> layer.visible; break; case PROP_LINKED: property >> layer.linked; break; case PROP_PRESERVE_TRANSPARENCY: property >> layer.preserve_transparency; break; case PROP_APPLY_MASK: property >> layer.apply_mask; break; case PROP_EDIT_MASK: property >> layer.edit_mask; break; case PROP_SHOW_MASK: property >> layer.show_mask; break; case PROP_OFFSETS: property >> layer.x_offset >> layer.y_offset; break; case PROP_MODE: property >> layer.mode; break; case PROP_TATTOO: property >> layer.tattoo; break; default: qDebug( "XCF: unimplemented layer property %d, size %d", type, bytes.size() ); } } } /*! * An XCF file can contain an arbitrary number of properties associated * with a channel. Note that this routine only reads mask channel properties. * \param xcf_io the data stream connected to the XCF image. * \param layer layer containing the mask channel to collect the properties. * \return true if there were no I/O errors. */ bool XCFImageFormat::loadChannelProperties ( SafeDataStream& xcf_io, Layer& layer ) { while ( true ) { PropType type; QByteArray bytes; if ( !loadProperty( xcf_io, type, bytes ) ) { qDebug( "XCF: error loading channel properties" ); return false; } QDataStream property( bytes, IO_ReadOnly ); switch ( type ) { case PROP_END: return true; case PROP_OPACITY: property >> layer.mask_channel.opacity; break; case PROP_VISIBLE: property >> layer.mask_channel.visible; break; case PROP_SHOW_MASKED: property >> layer.mask_channel.show_masked; break; case PROP_COLOR: property >> layer.mask_channel.red >> layer.mask_channel.green >> layer.mask_channel.blue; break; case PROP_TATTOO: property >> layer.mask_channel.tattoo; break; default: qDebug( "XCF: unimplemented channel property %d, size %d", type, bytes.size() ); } } } /*! * The GIMP stores images in a "mipmap"-like hierarchy. As far as the QImage * is concerned, however, only the top level (i.e., the full resolution image) * is used. * \param xcf_io the data stream connected to the XCF image. * \param layer the layer to collect the image. * \return true if there were no I/O errors. */ bool XCFImageFormat::loadHierarchy ( SafeDataStream& xcf_io, Layer& layer ) { Q_INT32 width; Q_INT32 height; Q_INT32 bpp; Q_UINT32 offset; xcf_io >> width >> height >> bpp >> offset; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer %s image header", layer.name ); return false; } // GIMP stores images in a "mipmap"-like format (multiple levels of // increasingly lower resolution). Only the top level is used here, // however. Q_UINT32 junk; do { xcf_io >> junk; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer %s level offsets", layer.name ); return false; } } while ( junk != 0 ); QIODevice::Offset saved_pos = xcf_io.device()->at(); xcf_io.device()->at( offset ); if ( !loadLevel( xcf_io, layer, bpp ) ) return false; xcf_io.device()->at( saved_pos ); return true; } /*! * Load one level of the image hierarchy (but only the top level is ever used). * \param xcf_io the data stream connected to the XCF image. * \param layer the layer to collect the image. * \param bpp the number of bytes in a pixel. * \return true if there were no I/O errors. * \sa loadTileRLE(). */ bool XCFImageFormat::loadLevel ( SafeDataStream& xcf_io, Layer& layer, Q_INT32 bpp ) { Q_INT32 width; Q_INT32 height; Q_UINT32 offset; xcf_io >> width >> height >> offset; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer %s level info", layer.name ); return false; } if ( offset == 0 ) return true; for ( uint j = 0; j < layer.nrows; j++ ) { for ( uint i = 0; i < layer.ncols; i++ ) { if ( offset == 0 ) { qDebug( "XCF: incorrect number of tiles in layer %s", layer.name ); return false; } QIODevice::Offset saved_pos = xcf_io.device()->at(); Q_UINT32 offset2; xcf_io >> offset2; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer %s level offset look-ahead", layer.name ); return false; } // Evidently, RLE can occasionally expand a tile instead of compressing it! if ( offset2 == 0 ) offset2 = offset + (uint)( TILE_WIDTH * TILE_HEIGHT * 4 * 1.5 ); xcf_io.device()->at( offset ); int size = layer.image_tiles[j][i].width() * layer.image_tiles[j][i].height(); if ( !loadTileRLE( xcf_io, layer.tile, size, offset2 - offset, bpp ) ) return false; // The bytes in the layer tile are juggled differently depending on // the target QImage. The caller has set layer.assignBytes to the // appropriate routine. layer.assignBytes( layer, i, j ); xcf_io.device()->at( saved_pos ); xcf_io >> offset; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on layer %s level offset", layer.name ); return false; } } } return true; } /*! * A layer can have a one channel image which is used as a mask. * \param xcf_io the data stream connected to the XCF image. * \param layer the layer to collect the mask image. * \return true if there were no I/O errors. */ bool XCFImageFormat::loadMask ( SafeDataStream& xcf_io, Layer& layer ) { Q_INT32 width; Q_INT32 height; char* name; xcf_io >> width >> height >> name; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on mask info" ); return false; } delete name; if ( !loadChannelProperties( xcf_io, layer ) ) return false; Q_UINT32 hierarchy_offset; xcf_io >> hierarchy_offset; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on mask image offset" ); return false; } xcf_io.device()->at( hierarchy_offset ); layer.assignBytes = assignMaskBytes; if ( !loadHierarchy( xcf_io, layer ) ) return false; return true; } /*! * This is the routine for which all the other code is simply * infrastructure. Read the image bytes out of the file and * store them in the tile buffer. This is passed a full 32-bit deep * buffer, even if bpp is smaller. The caller can figure out what to * do with the bytes. * * The tile is stored in "channels", i.e. the red component of all * pixels, then the green component of all pixels, then blue then * alpha, or, for indexed images, the color indices of all pixels then * the alpha of all pixels. * * The data is compressed with "run length encoding". Some simple data * integrity checks are made. * * \param xcf_io the data stream connected to the XCF image. * \param tile the buffer to expand the RLE into. * \param image_size number of bytes expected to be in the image tile. * \param data_length number of bytes expected in the RLE. * \param bpp number of bytes per pixel. * \return true if there were no I/O errors and no obvious corruption of * the RLE data. */ bool XCFImageFormat::loadTileRLE ( SafeDataStream& xcf_io, uchar* tile, int image_size, int data_length, Q_INT32 bpp ) { uchar* data; uchar* xcfdata; uchar* xcfodata; uchar* xcfdatalimit; xcfdata = xcfodata = new uchar[data_length]; int read_length=xcf_io.device()->readBlock( (char*)xcfdata, data_length ); if ( read_length<=0 ) { delete[] xcfodata; qDebug( "XCF: read failure on tile" ); return false; } xcfdatalimit = &xcfodata[read_length-1]; for ( int i = 0; i < bpp; ++i ) { data = tile + i; int count = 0; int size = image_size; while ( size > 0 ) { if ( xcfdata > xcfdatalimit ) goto bogus_rle; uchar val = *xcfdata++; uint length = val; if ( length >= 128 ) { length = 255 - ( length - 1 ); if ( length == 128 ) { if ( xcfdata >= xcfdatalimit ) goto bogus_rle; length = ( *xcfdata << 8 ) + xcfdata[1]; xcfdata += 2; } count += length; size -= length; if ( size < 0 ) goto bogus_rle; if ( &xcfdata[length-1] > xcfdatalimit ) goto bogus_rle; while ( length-- > 0 ) { *data = *xcfdata++; data += sizeof(QRgb); } } else { length += 1; if ( length == 128 ) { if ( xcfdata >= xcfdatalimit ) goto bogus_rle; length = ( *xcfdata << 8 ) + xcfdata[1]; xcfdata += 2; } count += length; size -= length; if ( size < 0 ) goto bogus_rle; if ( xcfdata > xcfdatalimit ) goto bogus_rle; val = *xcfdata++; while ( length-- > 0 ) { *data = val; data += sizeof(QRgb); } } } } delete[] xcfodata; return true; bogus_rle: qDebug( "The run length encoding could not be decoded properly" ); delete[] xcfodata; return false; } /*! * Copy the bytes from the tile buffer into the image tile QImage, taking into * account all the myriad different modes. * \param layer layer containing the tile buffer and the image tile matrix. * \param i column index of current tile. * \param j row index of current tile. */ void XCFImageFormat::assignImageBytes ( Layer& layer, uint i, uint j ) { uchar* tile = layer.tile; switch ( layer.type ) { case RGB_GIMAGE: for ( int l = 0; l < layer.image_tiles[j][i].height(); l++ ) { for ( int k = 0; k < layer.image_tiles[j][i].width(); k++ ) { layer.image_tiles[j][i].setPixel( k, l, qRgb( tile[0], tile[1], tile[2] ) ); tile += sizeof(QRgb); } } break; case RGBA_GIMAGE: for ( int l = 0; l < layer.image_tiles[j][i].height(); l++ ) { for ( int k = 0; k < layer.image_tiles[j][i].width(); k++ ) { layer.image_tiles[j][i].setPixel( k, l, qRgba( tile[0], tile[1], tile[2], tile[3] ) ); tile += sizeof(QRgb); } } break; case GRAY_GIMAGE: case INDEXED_GIMAGE: for ( int l = 0; l < layer.image_tiles[j][i].height(); l++ ) { for ( int k = 0; k < layer.image_tiles[j][i].width(); k++ ) { layer.image_tiles[j][i].setPixel( k, l, tile[0] ); tile += sizeof(QRgb); } } break; case GRAYA_GIMAGE: case INDEXEDA_GIMAGE: for ( int l = 0; l < layer.image_tiles[j][i].height(); l++ ) { for ( int k = 0; k < layer.image_tiles[j][i].width(); k++ ) { // The "if" here should not be necessary, but apparently there // are some cases where the image can contain larger indices // than there are colors in the palette. (A bug in The GIMP?) if ( tile[0] < layer.image_tiles[j][i].numColors() ) layer.image_tiles[j][i].setPixel( k, l, tile[0] ); layer.alpha_tiles[j][i].setPixel( k, l, tile[1] ); tile += sizeof(QRgb); } } break; } } /*! * Copy the bytes from the tile buffer into the mask tile QImage. * \param layer layer containing the tile buffer and the mask tile matrix. * \param i column index of current tile. * \param j row index of current tile. */ void XCFImageFormat::assignMaskBytes ( Layer& layer, uint i, uint j ) { uchar* tile = layer.tile; for ( int l = 0; l < layer.image_tiles[j][i].height(); l++ ) { for ( int k = 0; k < layer.image_tiles[j][i].width(); k++ ) { layer.mask_tiles[j][i].setPixel( k, l, tile[0] ); tile += sizeof(QRgb); } } } /*! * Read a single property from the image file. The property type is returned * in type and the data is returned in bytes. * \param xcf the image file data stream. * \param type returns with the property type. * \param bytes returns with the property data. * \return true if there were no IO errors. */ bool XCFImageFormat::loadProperty ( SafeDataStream& xcf_io, PropType& type, QByteArray& bytes ) { Q_UINT32 tmp; xcf_io >> tmp; type=static_cast(tmp); if ( xcf_io.failed() ) { qDebug( "XCF: read failure on property type" ); return false; } char* data; Q_UINT32 size; // The COLORMAP property is tricky: in version of GIMP older than 2.0.2, the // property size was wrong (it was 4 + ncolors instead of 4 + 3*ncolors). // This has been fixed in 2.0.2 (*), but the XCF format version has not been // increased, so we can't rely on the property size. The UINT32 after the // property size is the number of colors, which has always been correct, so // we read it, compute the size from it and put it back in the stream. // // * See http://bugzilla.gnome.org/show_bug.cgi?id=142149 and // gimp/app/xcf-save.c, revision 1.42 if ( type == PROP_COLORMAP ) { Q_UINT32 ignoredSize, ncolors; xcf_io >> ignoredSize; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on property %d size", type ); return false; } xcf_io >> ncolors; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on property %d size", type ); return false; } xcf_io.device()->ungetch( ncolors & 0xff); xcf_io.device()->ungetch( (ncolors>> 8) & 0xff ); xcf_io.device()->ungetch( (ncolors>>16) & 0xff ); xcf_io.device()->ungetch( (ncolors>>24) & 0xff ); size=4 + 3 * ncolors; data = new char[size]; xcf_io.readRawBytes( data, size ); } // The USER UNIT property size is not correct. I'm not sure why, though. else if ( type == PROP_USER_UNIT ) { float factor; Q_INT32 digits; char* unit_strings; xcf_io >> size >> factor >> digits; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on property %d", type ); return false; } for ( int i = 0; i < 5; i++ ) { xcf_io >> unit_strings; if ( xcf_io.failed() ) { qDebug( "XCF: read failure on property %d", type ); return false; } delete[] unit_strings; } size = 0; } else xcf_io.readBytes( data, size ); if ( xcf_io.failed() ) { qDebug( "XCF: read failure on property %d data, size %d", type, size ); return false; } if ( size != 0 ) { bytes.resize( size ); for ( uint i = 0; i < size; i++ ) bytes[i] = data[i]; delete[] data; } return true; } /*! * Copy a layer into an image, taking account of the manifold modes. The * contents of the image are replaced. * \param xcf_image contains the layer and image to be replaced. */ void XCFImageFormat::copyLayerToImage ( XCFImage& xcf_image ) { Layer& layer( xcf_image.layer ); QImage& image( xcf_image.image ); PixelCopyOperation copy = 0; switch ( layer.type ) { case RGB_GIMAGE: case RGBA_GIMAGE: copy = copyRGBToRGB; break; case GRAY_GIMAGE: if ( layer.opacity == OPAQUE_OPACITY ) copy = copyGrayToGray; else copy = copyGrayToRGB; break; case GRAYA_GIMAGE: copy = copyGrayAToRGB; break; case INDEXED_GIMAGE: copy = copyIndexedToIndexed; break; case INDEXEDA_GIMAGE: if ( xcf_image.image.depth() <= 8 ) copy = copyIndexedAToIndexed; else copy = copyIndexedAToRGB; } // For each tile... for ( uint j = 0; j < layer.nrows; j++ ) { uint y = j * TILE_HEIGHT; for ( uint i = 0; i < layer.ncols; i++ ) { uint x = i * TILE_WIDTH; // This seems the best place to apply the dissolve because it // depends on the global position of each tile's // pixels. Apparently it's the only mode which can apply to a // single layer. if ( layer.mode == DISSOLVE_MODE ) { if ( layer.type == RGBA_GIMAGE ) dissolveRGBPixels( layer.image_tiles[j][i], x, y ); else if ( layer.type == GRAYA_GIMAGE ) dissolveAlphaPixels( layer.alpha_tiles[j][i], x, y ); } for ( int l = 0; l < layer.image_tiles[j][i].height(); l++ ) { for ( int k = 0; k < layer.image_tiles[j][i].width(); k++ ) { int m = x + k + layer.x_offset; int n = y + l + layer.y_offset; if ( m < 0 || m >= image.width() || n < 0 || n >= image.height() ) continue; (*copy)( layer, i, j, k, l, image, m, n ); } } } } } /*! * Copy an RGB pixel from the layer to the RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::copyRGBToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { QRgb src = layer.image_tiles[j][i].pixel( k, l ); uchar src_a = layer.opacity; if ( layer.type == RGBA_GIMAGE ) src_a = INT_MULT( src_a, qAlpha( src ) ); // Apply the mask (if any) if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); image.setPixel( m, n, qRgba( src, src_a ) ); } /*! * Copy a Gray pixel from the layer to the Gray image. Straight-forward. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::copyGrayToGray ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { int src = layer.image_tiles[j][i].pixelIndex( k, l ); image.setPixel( m, n, src ); } /*! * Copy a Gray pixel from the layer to an RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::copyGrayToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { QRgb src = layer.image_tiles[j][i].pixel( k, l ); uchar src_a = layer.opacity; image.setPixel( m, n, qRgba( src, src_a ) ); } /*! * Copy a GrayA pixel from the layer to an RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::copyGrayAToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { QRgb src = layer.image_tiles[j][i].pixel( k, l ); uchar src_a = layer.alpha_tiles[j][i].pixelIndex( k, l ); src_a = INT_MULT( src_a, layer.opacity ); // Apply the mask (if any) if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); image.setPixel( m, n, qRgba( src, src_a ) ); } /*! * Copy an Indexed pixel from the layer to the Indexed image. Straight-forward. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::copyIndexedToIndexed ( Layer& layer, uint i,uint j,int k,int l, QImage& image, int m, int n ) { int src = layer.image_tiles[j][i].pixelIndex( k, l ); image.setPixel( m, n, src ); } /*! * Copy an IndexedA pixel from the layer to the Indexed image. Straight-forward. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::copyIndexedAToIndexed ( Layer& layer,uint i,uint j,int k,int l, QImage& image, int m, int n ) { uchar src = layer.image_tiles[j][i].pixelIndex( k, l ); uchar src_a = layer.alpha_tiles[j][i].pixelIndex( k, l ); src_a = INT_MULT( src_a, layer.opacity ); if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); if ( src_a > 127 ) src++; else src = 0; image.setPixel( m, n, src ); } /*! * Copy an IndexedA pixel from the layer to an RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::copyIndexedAToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { QRgb src = layer.image_tiles[j][i].pixel( k, l ); uchar src_a = layer.alpha_tiles[j][i].pixelIndex( k, l ); src_a = INT_MULT( src_a, layer.opacity ); // Apply the mask (if any) if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); // This is what appears in the GIMP window if ( src_a <= 127 ) src_a = 0; else src_a = OPAQUE_OPACITY; image.setPixel( m, n, qRgba( src, src_a ) ); } /*! * Merge a layer into an image, taking account of the manifold modes. * \param xcf_image contains the layer and image to merge. */ void XCFImageFormat::mergeLayerIntoImage ( XCFImage& xcf_image ) { Layer& layer( xcf_image.layer ); QImage& image( xcf_image.image ); PixelMergeOperation merge = 0; switch ( layer.type ) { case RGB_GIMAGE: case RGBA_GIMAGE: merge = mergeRGBToRGB; break; case GRAY_GIMAGE: if ( layer.opacity == OPAQUE_OPACITY ) merge = mergeGrayToGray; else merge = mergeGrayToRGB; break; case GRAYA_GIMAGE: if ( xcf_image.image.depth() <= 8 ) merge = mergeGrayAToGray; else merge = mergeGrayAToRGB; break; case INDEXED_GIMAGE: merge = mergeIndexedToIndexed; break; case INDEXEDA_GIMAGE: if ( xcf_image.image.depth() <= 8 ) merge = mergeIndexedAToIndexed; else merge = mergeIndexedAToRGB; } for ( uint j = 0; j < layer.nrows; j++ ) { uint y = j * TILE_HEIGHT; for ( uint i = 0; i < layer.ncols; i++ ) { uint x = i * TILE_WIDTH; // This seems the best place to apply the dissolve because it // depends on the global position of each tile's // pixels. Apparently it's the only mode which can apply to a // single layer. if ( layer.mode == DISSOLVE_MODE ) { if ( layer.type == RGBA_GIMAGE ) dissolveRGBPixels( layer.image_tiles[j][i], x, y ); else if ( layer.type == GRAYA_GIMAGE ) dissolveAlphaPixels( layer.alpha_tiles[j][i], x, y ); } for ( int l = 0; l < layer.image_tiles[j][i].height(); l++ ) { for ( int k = 0; k < layer.image_tiles[j][i].width(); k++ ) { int m = x + k + layer.x_offset; int n = y + l + layer.y_offset; if ( m < 0 || m >= image.width() || n < 0 || n >= image.height() ) continue; (*merge)( layer, i, j, k, l, image, m, n ); } } } } } /*! * Merge an RGB pixel from the layer to the RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeRGBToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { QRgb src = layer.image_tiles[j][i].pixel( k, l ); QRgb dst = image.pixel( m, n ); uchar src_r = qRed( src ); uchar src_g = qGreen( src ); uchar src_b = qBlue( src ); uchar src_a = qAlpha( src ); uchar dst_r = qRed( dst ); uchar dst_g = qGreen( dst ); uchar dst_b = qBlue( dst ); uchar dst_a = qAlpha( dst ); switch ( layer.mode ) { case MULTIPLY_MODE: { src_r = INT_MULT( src_r, dst_r ); src_g = INT_MULT( src_g, dst_g ); src_b = INT_MULT( src_b, dst_b ); src_a = MIN( src_a, dst_a ); } break; case DIVIDE_MODE: { src_r = MIN( ( dst_r * 256 ) / ( 1 + src_r ), 255 ); src_g = MIN( ( dst_g * 256 ) / ( 1 + src_g ), 255 ); src_b = MIN( ( dst_b * 256 ) / ( 1 + src_b ), 255 ); src_a = MIN( src_a, dst_a ); } break; case SCREEN_MODE: { src_r = 255 - INT_MULT( 255 - dst_r, 255 - src_r ); src_g = 255 - INT_MULT( 255 - dst_g, 255 - src_g ); src_b = 255 - INT_MULT( 255 - dst_b, 255 - src_b ); src_a = MIN( src_a, dst_a ); } break; case OVERLAY_MODE: { src_r = INT_MULT( dst_r, dst_r + INT_MULT( 2 * src_r, 255 - dst_r ) ); src_g = INT_MULT( dst_g, dst_g + INT_MULT( 2 * src_g, 255 - dst_g ) ); src_b = INT_MULT( dst_b, dst_b + INT_MULT( 2 * src_b, 255 - dst_b ) ); src_a = MIN( src_a, dst_a ); } break; case DIFFERENCE_MODE: { src_r = dst_r > src_r ? dst_r - src_r : src_r - dst_r; src_g = dst_g > src_g ? dst_g - src_g : src_g - dst_g; src_b = dst_b > src_b ? dst_b - src_b : src_b - dst_b; src_a = MIN( src_a, dst_a ); } break; case ADDITION_MODE: { src_r = add_lut[dst_r][src_r]; src_g = add_lut[dst_g][src_g]; src_b = add_lut[dst_b][src_b]; src_a = MIN( src_a, dst_a ); } break; case SUBTRACT_MODE: { src_r = dst_r > src_r ? dst_r - src_r : 0; src_g = dst_g > src_g ? dst_g - src_g : 0; src_b = dst_b > src_b ? dst_b - src_b : 0; src_a = MIN( src_a, dst_a ); } break; case DARKEN_ONLY_MODE: { src_r = dst_r < src_r ? dst_r : src_r; src_g = dst_g < src_g ? dst_g : src_g; src_b = dst_b < src_b ? dst_b : src_b; src_a = MIN( src_a, dst_a ); } break; case LIGHTEN_ONLY_MODE: { src_r = dst_r < src_r ? src_r : dst_r; src_g = dst_g < src_g ? src_g : dst_g; src_b = dst_b < src_b ? src_b : dst_b; src_a = MIN( src_a, dst_a ); } break; case HUE_MODE: { uchar new_r = dst_r; uchar new_g = dst_g; uchar new_b = dst_b; RGBTOHSV( src_r, src_g, src_b ); RGBTOHSV( new_r, new_g, new_b ); new_r = src_r; HSVTORGB( new_r, new_g, new_b ); src_r = new_r; src_g = new_g; src_b = new_b; src_a = MIN( src_a, dst_a ); } break; case SATURATION_MODE: { uchar new_r = dst_r; uchar new_g = dst_g; uchar new_b = dst_b; RGBTOHSV( src_r, src_g, src_b ); RGBTOHSV( new_r, new_g, new_b ); new_g = src_g; HSVTORGB( new_r, new_g, new_b ); src_r = new_r; src_g = new_g; src_b = new_b; src_a = MIN( src_a, dst_a ); } break; case VALUE_MODE: { uchar new_r = dst_r; uchar new_g = dst_g; uchar new_b = dst_b; RGBTOHSV( src_r, src_g, src_b ); RGBTOHSV( new_r, new_g, new_b ); new_b = src_b; HSVTORGB( new_r, new_g, new_b ); src_r = new_r; src_g = new_g; src_b = new_b; src_a = MIN( src_a, dst_a ); } break; case COLOR_MODE: { uchar new_r = dst_r; uchar new_g = dst_g; uchar new_b = dst_b; RGBTOHLS( src_r, src_g, src_b ); RGBTOHLS( new_r, new_g, new_b ); new_r = src_r; new_b = src_b; HLSTORGB( new_r, new_g, new_b ); src_r = new_r; src_g = new_g; src_b = new_b; src_a = MIN( src_a, dst_a ); } break; } src_a = INT_MULT( src_a, layer.opacity ); // Apply the mask (if any) if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); uchar new_r, new_g, new_b, new_a; new_a = dst_a + INT_MULT( OPAQUE_OPACITY - dst_a, src_a ); float src_ratio = (float)src_a / new_a; float dst_ratio = 1. - src_ratio; new_r = (uchar)( src_ratio * src_r + dst_ratio * dst_r + EPSILON ); new_g = (uchar)( src_ratio * src_g + dst_ratio * dst_g + EPSILON ); new_b = (uchar)( src_ratio * src_b + dst_ratio * dst_b + EPSILON ); if ( !layer_modes[layer.mode].affect_alpha ) new_a = dst_a; image.setPixel( m, n, qRgba( new_r, new_g, new_b, new_a ) ); } /*! * Merge a Gray pixel from the layer to the Gray image. Straight-forward. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeGrayToGray ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { int src = layer.image_tiles[j][i].pixelIndex( k, l ); image.setPixel( m, n, src ); } /*! * Merge a GrayA pixel from the layer to the Gray image. Straight-forward. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeGrayAToGray ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { int src = qGray( layer.image_tiles[j][i].pixel( k, l ) ); int dst = image.pixelIndex( m, n ); uchar src_a = layer.alpha_tiles[j][i].pixelIndex( k, l ); switch ( layer.mode ) { case MULTIPLY_MODE: { src = INT_MULT( src, dst ); } break; case DIVIDE_MODE: { src = MIN( ( dst * 256 ) / ( 1 + src ), 255 ); } break; case SCREEN_MODE: { src = 255 - INT_MULT( 255 - dst, 255 - src ); } break; case OVERLAY_MODE: { src = INT_MULT( dst, dst + INT_MULT( 2 * src, 255 - dst ) ); } break; case DIFFERENCE_MODE: { src = dst > src ? dst - src : src - dst; } break; case ADDITION_MODE: { src = add_lut[dst][src]; } break; case SUBTRACT_MODE: { src = dst > src ? dst - src : 0; } break; case DARKEN_ONLY_MODE: { src = dst < src ? dst : src; } break; case LIGHTEN_ONLY_MODE: { src = dst < src ? src : dst; } break; } src_a = INT_MULT( src_a, layer.opacity ); // Apply the mask (if any) if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); uchar new_a = OPAQUE_OPACITY; float src_ratio = (float)src_a / new_a; float dst_ratio = 1. - src_ratio; uchar new_g = (uchar)( src_ratio * src + dst_ratio * dst + EPSILON ); image.setPixel( m, n, new_g ); } /*! * Merge a Gray pixel from the layer to an RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeGrayToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { QRgb src = layer.image_tiles[j][i].pixel( k, l ); uchar src_a = layer.opacity; image.setPixel( m, n, qRgba( src, src_a ) ); } /*! * Merge a GrayA pixel from the layer to an RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeGrayAToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { int src = qGray( layer.image_tiles[j][i].pixel( k, l ) ); int dst = qGray( image.pixel( m, n ) ); uchar src_a = layer.alpha_tiles[j][i].pixelIndex( k, l ); uchar dst_a = qAlpha( image.pixel( m, n ) ); switch ( layer.mode ) { case MULTIPLY_MODE: { src = INT_MULT( src, dst ); src_a = MIN( src_a, dst_a ); } break; case DIVIDE_MODE: { src = MIN( ( dst * 256 ) / ( 1 + src ), 255 ); src_a = MIN( src_a, dst_a ); } break; case SCREEN_MODE: { src = 255 - INT_MULT( 255 - dst, 255 - src ); src_a = MIN( src_a, dst_a ); } break; case OVERLAY_MODE: { src = INT_MULT( dst, dst + INT_MULT( 2 * src, 255 - dst ) ); src_a = MIN( src_a, dst_a ); } break; case DIFFERENCE_MODE: { src = dst > src ? dst - src : src - dst; src_a = MIN( src_a, dst_a ); } break; case ADDITION_MODE: { src = add_lut[dst][src]; src_a = MIN( src_a, dst_a ); } break; case SUBTRACT_MODE: { src = dst > src ? dst - src : 0; src_a = MIN( src_a, dst_a ); } break; case DARKEN_ONLY_MODE: { src = dst < src ? dst : src; src_a = MIN( src_a, dst_a ); } break; case LIGHTEN_ONLY_MODE: { src = dst < src ? src : dst; src_a = MIN( src_a, dst_a ); } break; } src_a = INT_MULT( src_a, layer.opacity ); // Apply the mask (if any) if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); uchar new_a = dst_a + INT_MULT( OPAQUE_OPACITY - dst_a, src_a ); float src_ratio = (float)src_a / new_a; float dst_ratio = 1. - src_ratio; uchar new_g = (uchar)( src_ratio * src + dst_ratio * dst + EPSILON ); if ( !layer_modes[layer.mode].affect_alpha ) new_a = dst_a; image.setPixel( m, n, qRgba( new_g, new_g, new_g, new_a ) ); } /*! * Merge an Indexed pixel from the layer to the Indexed image. Straight-forward. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeIndexedToIndexed ( Layer& layer, uint i,uint j,int k,int l, QImage& image, int m, int n ) { int src = layer.image_tiles[j][i].pixelIndex( k, l ); image.setPixel( m, n, src ); } /*! * Merge an IndexedA pixel from the layer to the Indexed image. Straight-forward. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeIndexedAToIndexed ( Layer& layer,uint i,uint j,int k,int l, QImage& image, int m, int n ) { uchar src = layer.image_tiles[j][i].pixelIndex( k, l ); uchar src_a = layer.alpha_tiles[j][i].pixelIndex( k, l ); src_a = INT_MULT( src_a, layer.opacity ); if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); if ( src_a > 127 ) { src++; image.setPixel( m, n, src ); } } /*! * Merge an IndexedA pixel from the layer to an RGB image. Straight-forward. * The only thing this has to take account of is the opacity of the * layer. Evidently, the GIMP exporter itself does not actually do this. * \param layer source layer. * \param i x tile index. * \param j y tile index. * \param k x pixel index of tile i,j. * \param l y pixel index of tile i,j. * \param image destination image. * \param m x pixel of destination image. * \param n y pixel of destination image. */ void XCFImageFormat::mergeIndexedAToRGB ( Layer& layer, uint i, uint j, int k, int l, QImage& image, int m, int n ) { QRgb src = layer.image_tiles[j][i].pixel( k, l ); uchar src_a = layer.alpha_tiles[j][i].pixelIndex( k, l ); src_a = INT_MULT( src_a, layer.opacity ); // Apply the mask (if any) if ( layer.apply_mask == 1 && layer.mask_tiles.size() > j && layer.mask_tiles[j].size() > i ) src_a = INT_MULT( src_a, layer.mask_tiles[j][i].pixelIndex( k, l ) ); // This is what appears in the GIMP window if ( src_a <= 127 ) src_a = 0; else src_a = OPAQUE_OPACITY; image.setPixel( m, n, qRgba( src, src_a ) ); } /*! * Dissolving pixels: pick a random number between 0 and 255. If the pixel's * alpha is less than that, make it transparent. * \param image the image tile to dissolve. * \param x the global x position of the tile. * \param y the global y position of the tile. */ void XCFImageFormat::dissolveRGBPixels ( QImage& image, int x, int y ) { // The apparently spurious rand() calls are to wind the random // numbers up to the same point for each tile. for ( int l = 0; l < image.height(); l++ ) { srand( random_table[( l + y ) % RANDOM_TABLE_SIZE] ); for ( int k = 0; k < x; k++ ) rand(); for ( int k = 0; k < image.width(); k++ ) { int rand_val = rand() & 0xff; QRgb pixel = image.pixel( k, l ); if ( rand_val > qAlpha( pixel ) ) { image.setPixel( k, l, qRgba( pixel, 0 ) ); } } } } /*! * Dissolving pixels: pick a random number between 0 and 255. If the pixel's * alpha is less than that, make it transparent. This routine works for * the GRAYA and INDEXEDA image types where the pixel alpha's are stored * separately from the pixel themselves. * \param image the alpha tile to dissolve. * \param x the global x position of the tile. * \param y the global y position of the tile. */ void XCFImageFormat::dissolveAlphaPixels ( QImage& image, int x, int y ) { // The apparently spurious rand() calls are to wind the random // numbers up to the same point for each tile. for ( int l = 0; l < image.height(); l++ ) { srand( random_table[( l + y ) % RANDOM_TABLE_SIZE] ); for ( int k = 0; k < x; k++ ) rand(); for ( int k = 0; k < image.width(); k++ ) { int rand_val = rand() & 0xff; uchar alpha = image.pixelIndex( k, l ); if ( rand_val > alpha ) { image.setPixel( k, l, 0 ); } } } } KDE_Q_EXPORT_PLUGIN( XCFImageFormat ) } // namespace