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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commitce4a32fe52ef09d8f5ff1dd22c001110902b60a2 (patch)
tree5ac38a06f3dde268dc7927dc155896926aaf7012 /kimgio/xcf.cpp
downloadtdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.tar.gz
tdelibs-ce4a32fe52ef09d8f5ff1dd22c001110902b60a2.zip
Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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diff --git a/kimgio/xcf.cpp b/kimgio/xcf.cpp
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+/*
+ * 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);
+ }
+ }
+ }
+}
+