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Diffstat (limited to 'kimgio/xcf.cpp')
| -rw-r--r-- | kimgio/xcf.cpp | 2116 |
1 files changed, 2116 insertions, 0 deletions
diff --git a/kimgio/xcf.cpp b/kimgio/xcf.cpp new file mode 100644 index 000000000..c7164d7ba --- /dev/null +++ b/kimgio/xcf.cpp @@ -0,0 +1,2116 @@ +/* + * qxcfi.cpp: A Qt 3 plug-in for reading GIMP XCF image files + * Copyright (C) 2001 lignum Computing, Inc. <allen@lignumcomputing.com> + * Copyright (C) 2004 Melchior FRANZ <mfranz@kde.org> + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <stdlib.h> +#include <qimage.h> +#include <qiodevice.h> +#include <qvaluestack.h> +#include <qvaluevector.h> + +#include <kdebug.h> +#include "xcf.h" + + +/////////////////////////////////////////////////////////////////////////////// + + +KDE_EXPORT void kimgio_xcf_read(QImageIO *io) +{ + XCFImageFormat xcfif; + xcfif.readXCF(io); +} + + +KDE_EXPORT void kimgio_xcf_write(QImageIO *io) +{ + kdDebug(399) << "XCF: write support not implemented" << endl; + io->setStatus(-1); +} + +/////////////////////////////////////////////////////////////////////////////// + + + +int XCFImageFormat::random_table[RANDOM_TABLE_SIZE]; + +//int XCFImageFormat::add_lut[256][256]; + + +const 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 +}; + + +//! Change a QRgb value's alpha only. +inline QRgb qRgba ( QRgb rgb, int a ) +{ + return ((a & 0xff) << 24 | (rgb & RGB_MASK)); +} + + +/*! + * The constructor for the XCF image loader. This initializes the + * tables used in the layer merging routines. + */ +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; +// } +// } +} + +inline +int XCFImageFormat::add_lut( int a, int b ) { + return QMIN( a + b, 255 ); +} + +void XCFImageFormat::readXCF(QImageIO *io) +{ + XCFImage xcf_image; + QDataStream xcf_io(io->ioDevice()); + + char tag[14]; + xcf_io.readRawBytes(tag, sizeof(tag)); + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on header tag" << endl; + return; + } + + xcf_io >> xcf_image.width >> xcf_image.height >> xcf_image.type; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on image info" << endl; + return; + } + +kdDebug() << tag << " " << xcf_image.width << " " << xcf_image.height << " " << xcf_image.type << endl; + 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.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer offsets" << endl; + return; + } + + if (layer_offset == 0) + break; + + layer_offsets.push(layer_offset); + } + + xcf_image.num_layers = layer_offsets.size(); + + if (layer_offsets.size() == 0) { + kdDebug(399) << "XCF: no layers!" << endl; + 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) { + kdDebug(399) << "XCF: no visible layers!" << endl; + return; + } + + io->setImage(xcf_image.image); + io->setStatus(0); +} + + +/*! + * 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(QDataStream& xcf_io, XCFImage& xcf_image) +{ + while (true) { + PropType type; + QByteArray bytes; + + if (!loadProperty(xcf_io, type, bytes)) { + kdDebug(399) << "XCF: error loading global image properties" << endl; + return false; + } + + QDataStream property(bytes, IO_ReadOnly); + + switch (type) { + case PROP_END: + return true; + + case PROP_COMPRESSION: + property >> xcf_image.compression; + 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=0; + property >> flags >> data; + + if (tag && strncmp(tag, "gimp-comment", strlen("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; + if(xcf_image.num_colors < 0 || xcf_image.num_colors > 65535) + return false; + + 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: + kdDebug(399) << "XCF: unimplemented image property" << type + << ", size " << bytes.size() << endl; + } + } +} + + +/*! + * 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(QDataStream& xcf_io, PropType& type, QByteArray& bytes) +{ + Q_UINT32 foo; + xcf_io >> foo; + type=PropType(foo); // TODO urks + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on property type" << type << endl; + return false; + } + + char* data; + Q_UINT32 size; + + // The colormap property size is not the correct number of bytes: + // The GIMP source xcf.c has size = 4 + ncolors, but it should be + // 4 + 3 * ncolors + + if (type == PROP_COLORMAP) { + xcf_io >> size; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on property " << type << " size" << endl; + return false; + } + + if(size > 65535 || size < 4) + return false; + + size = 3 * (size - 4) + 4; + data = new char[size]; + + xcf_io.readRawBytes(data, size); + } else if (type == PROP_USER_UNIT) { + // The USER UNIT property size is not correct. I'm not sure why, though. + float factor; + Q_INT32 digits; + char* unit_strings; + + xcf_io >> size >> factor >> digits; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on property " << type << endl; + return false; + } + + for (int i = 0; i < 5; i++) { + xcf_io >> unit_strings; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on property " << type << endl; + return false; + } + + delete[] unit_strings; + } + + size = 0; + } else { + xcf_io >> size; + if(size >256000) + return false; + data = new char[size]; + xcf_io.readRawBytes(data, size); + } + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on property " << type << " data, size " << size << endl; + return false; + } + + if (size != 0 && data) { + bytes.assign(data,size); + } + + return true; +} + + +/*! + * 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(QDataStream& xcf_io, XCFImage& xcf_image) +{ + Layer& layer(xcf_image.layer); + delete[] layer.name; + + xcf_io >> layer.width >> layer.height >> layer.type >> layer.name; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer" << endl; + 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.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer image offsets" << endl; + return false; + } + + // Allocate the individual tile QImages based on the size and type + // of this layer. + + if( !composeTiles(xcf_image)) + return false; + 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) { + if( !initializeImage(xcf_image)) + return false; + 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(QDataStream& xcf_io, Layer& layer) +{ + while (true) { + PropType type; + QByteArray bytes; + + if (!loadProperty(xcf_io, type, bytes)) { + kdDebug(399) << "XCF: error loading layer properties" << endl; + 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: + kdDebug(399) << "XCF: unimplemented layer property " << type + << ", size " << bytes.size() << endl; + } + } +} + + +/*! + * Compute the number of tiles in the current layer and allocate + * QImage structures for each of them. + * \param xcf_image contains the current layer. + */ +bool 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); + if( layer.image_tiles[j][i].isNull()) + return false; + layer.image_tiles[j][i].setAlphaBuffer(false); + break; + + case RGBA_GIMAGE: + layer.image_tiles[j][i] = QImage(tile_width, tile_height, 32, 0); + if( layer.image_tiles[j][i].isNull()) + return false; + layer.image_tiles[j][i].setAlphaBuffer(true); + break; + + case GRAY_GIMAGE: + layer.image_tiles[j][i] = QImage(tile_width, tile_height, 8, 256); + if( layer.image_tiles[j][i].isNull()) + return false; + setGrayPalette(layer.image_tiles[j][i]); + break; + + case GRAYA_GIMAGE: + layer.image_tiles[j][i] = QImage(tile_width, tile_height, 8, 256); + if( layer.image_tiles[j][i].isNull()) + return false; + setGrayPalette(layer.image_tiles[j][i]); + + layer.alpha_tiles[j][i] = QImage( tile_width, tile_height, 8, 256); + if( layer.alpha_tiles[j][i].isNull()) + return false; + 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); + if( layer.image_tiles[j][i].isNull()) + return false; + 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); + if( layer.image_tiles[j][i].isNull()) + return false; + setPalette(xcf_image, layer.image_tiles[j][i]); + + layer.alpha_tiles[j][i] = QImage(tile_width, tile_height, 8, 256); + if( layer.alpha_tiles[j][i].isNull()) + return false; + setGrayPalette(layer.alpha_tiles[j][i]); + } + + if (layer.mask_offset != 0) { + layer.mask_tiles[j][i] = QImage(tile_width, tile_height, 8, 256); + if( layer.mask_tiles[j][i].isNull()) + return false; + setGrayPalette(layer.mask_tiles[j][i]); + } + } + } + return true; +} + + +/*! + * 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]); +} + + +/*! + * 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; + } +} + + +/*! + * 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(QDataStream& 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.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer " << layer.name << " image header" << endl; + 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.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer " << layer.name << " level offsets" << endl; + 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(QDataStream& xcf_io, Layer& layer, Q_INT32 bpp) +{ + Q_INT32 width; + Q_INT32 height; + Q_UINT32 offset; + + xcf_io >> width >> height >> offset; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer " << layer.name << " level info" << endl; + 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) { + kdDebug(399) << "XCF: incorrect number of tiles in layer " << layer.name << endl; + return false; + } + + QIODevice::Offset saved_pos = xcf_io.device()->at(); + Q_UINT32 offset2; + xcf_io >> offset2; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer " << layer.name << " level offset look-ahead" << endl; + 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.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on layer " << layer.name << " level offset" << endl; + 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(QDataStream& xcf_io, Layer& layer) +{ + Q_INT32 width; + Q_INT32 height; + char* name; + + xcf_io >> width >> height >> name; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on mask info" << endl; + return false; + } + + delete name; + + if (!loadChannelProperties(xcf_io, layer)) + return false; + + Q_UINT32 hierarchy_offset; + xcf_io >> hierarchy_offset; + + if (xcf_io.device()->status() != IO_Ok) { + kdDebug(399) << "XCF: read failure on mask image offset" << endl; + 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(QDataStream& 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]; + + xcf_io.readRawBytes((char*)xcfdata, data_length); + + if (xcf_io.device()->status() != IO_Ok) { + delete[] xcfodata; + kdDebug(399) << "XCF: read failure on tile" << endl; + return false; + } + + xcfdatalimit = &xcfodata[data_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: + + kdDebug(399) << "The run length encoding could not be decoded properly" << endl; + delete[] xcfodata; + return false; +} + + +/*! + * 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(QDataStream& xcf_io, Layer& layer) +{ + while (true) { + PropType type; + QByteArray bytes; + + if (!loadProperty(xcf_io, type, bytes)) { + kdDebug(399) << "XCF: error loading channel properties" << endl; + 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: + kdDebug(399) << "XCF: unimplemented channel property " << type + << ", size " << bytes.size() << endl; + } + } +} + + +/*! + * 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); + } + } +} + + +/*! + * 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. + */ +bool 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); + if( image.isNull()) + return false; + 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); + if( image.isNull()) + return false; + 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); + if( image.isNull()) + return false; + 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); + if( image.isNull()) + return false; + 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 + // presense 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); + if( image.isNull()) + return false; + 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); + if( image.isNull()) + return false; + 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); + if( image.isNull()) + return false; + 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); + if( image.isNull()) + return false; + 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); + if( image.isNull()) + return false; + 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)); + 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 = KMIN(src_a, dst_a); + } + break; + case DIVIDE_MODE: { + src_r = KMIN((dst_r * 256) / (1 + src_r), 255); + src_g = KMIN((dst_g * 256) / (1 + src_g), 255); + src_b = KMIN((dst_b * 256) / (1 + src_b), 255); + src_a = KMIN(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 = KMIN(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 = KMIN(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 = KMIN(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 = KMIN(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 = KMIN(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 = KMIN( 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 = KMIN(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 = KMIN( 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 = KMIN(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 = KMIN(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 = KMIN(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 = 1.0 - 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 = KMIN((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 = 1.0 - 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 = KMIN(src_a, dst_a); + } + break; + case DIVIDE_MODE: { + src = KMIN((dst * 256) / (1 + src), 255); + src_a = KMIN(src_a, dst_a); + } + break; + case SCREEN_MODE: { + src = 255 - INT_MULT(255 - dst, 255 - src); + src_a = KMIN(src_a, dst_a); + } + break; + case OVERLAY_MODE: { + src = INT_MULT( dst, dst + INT_MULT(2 * src, 255 - dst)); + src_a = KMIN(src_a, dst_a); + } + break; + case DIFFERENCE_MODE: { + src = dst > src ? dst - src : src - dst; + src_a = KMIN(src_a, dst_a); + } + break; + case ADDITION_MODE: { + src = add_lut(dst,src); + src_a = KMIN(src_a, dst_a); + } + break; + case SUBTRACT_MODE: { + src = dst > src ? dst - src : 0; + src_a = KMIN(src_a, dst_a); + } + break; + case DARKEN_ONLY_MODE: { + src = dst < src ? dst : src; + src_a = KMIN(src_a, dst_a); + } + break; + case LIGHTEN_ONLY_MODE: { + src = dst < src ? src : dst; + src_a = KMIN(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 = 1.0 - 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); + } + } + } +} + |