FCL/sf/mw/qt: comparison src/plugins/imageformats/ico/qicohandler.cpp

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+:1918ee327afb
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+/*!
+\class QtIcoHandler
+\since 4.4
+\brief The QtIcoHandler class provides support for the ICO image format.
+\internal
+*/
+#include "qicohandler.h"
+#include <QtCore/qendian.h>
+#include <QtGui/QImage>
+#include <QtCore/QFile>
+#include <QtCore/QBuffer>
+// These next two structs represent how the icon information is stored
+// in an ICO file.
+typedef struct
+{
+quint8  bWidth;               // Width of the image
+quint8  bHeight;              // Height of the image (times 2)
+quint8  bColorCount;          // Number of colors in image (0 if >=8bpp) [ not ture ]
+quint8  bReserved;            // Reserved
+quint16 wPlanes;              // Color Planes
+quint16 wBitCount;            // Bits per pixel
+quint32 dwBytesInRes;         // how many bytes in this resource?
+quint32 dwImageOffset;        // where in the file is this image
+} ICONDIRENTRY, *LPICONDIRENTRY;
+#define ICONDIRENTRY_SIZE 16
+typedef struct
+{
+quint16 idReserved;   // Reserved
+quint16 idType;       // resource type (1 for icons)
+quint16 idCount;      // how many images?
+ICONDIRENTRY    idEntries[1]; // the entries for each image
+} ICONDIR, *LPICONDIR;
+#define ICONDIR_SIZE    6       // Exclude the idEntries field
+typedef struct {                    // BMP information header
+quint32 biSize;                // size of this struct
+quint32 biWidth;               // pixmap width
+quint32 biHeight;              // pixmap height     (specifies the combined height of the XOR and AND masks)
+quint16 biPlanes;              // should be 1
+quint16 biBitCount;            // number of bits per pixel
+quint32 biCompression;         // compression method
+quint32 biSizeImage;           // size of image
+quint32 biXPelsPerMeter;       // horizontal resolution
+quint32 biYPelsPerMeter;       // vertical resolution
+quint32 biClrUsed;             // number of colors used
+quint32 biClrImportant;        // number of important colors
+} BMP_INFOHDR ,*LPBMP_INFOHDR;
+#define BMP_INFOHDR_SIZE 40
+class ICOReader
+{
+public:
+ICOReader(QIODevice * iodevice);
+int count();
+QImage iconAt(int index);
+static bool canRead(QIODevice *iodev);
+static QList<QImage> read(QIODevice * device);
+static bool write(QIODevice * device, const QList<QImage> & images);
+private:
+bool readHeader();
+bool readIconEntry(int index, ICONDIRENTRY * iconEntry);
+bool readBMPHeader(quint32 imageOffset, BMP_INFOHDR * header);
+void findColorInfo(QImage & image);
+void readColorTable(QImage & image);
+void readBMP(QImage & image);
+void read1BitBMP(QImage & image);
+void read4BitBMP(QImage & image);
+void read8BitBMP(QImage & image);
+void read16_24_32BMP(QImage & image);
+struct IcoAttrib
+{
+int nbits;
+int ncolors;
+int h;
+int w;
+int depth;
+} icoAttrib;
+QIODevice * iod;
+qint64 startpos;
+bool headerRead;
+ICONDIR iconDir;
+};
+// Data readers and writers that takes care of alignment and endian stuff.
+static bool readIconDirEntry(QIODevice *iodev, ICONDIRENTRY *iconDirEntry)
+{
+if (iodev) {
+uchar tmp[ICONDIRENTRY_SIZE];
+if (iodev->read((char*)tmp, ICONDIRENTRY_SIZE) == ICONDIRENTRY_SIZE) {
+iconDirEntry->bWidth = tmp[0];
+iconDirEntry->bHeight = tmp[1];
+iconDirEntry->bColorCount = tmp[2];
+iconDirEntry->bReserved = tmp[3];
+iconDirEntry->wPlanes = qFromLittleEndian<quint16>(&tmp[4]);
+iconDirEntry->wBitCount = qFromLittleEndian<quint16>(&tmp[6]);
+iconDirEntry->dwBytesInRes = qFromLittleEndian<quint32>(&tmp[8]);
+iconDirEntry->dwImageOffset = qFromLittleEndian<quint32>(&tmp[12]);
+return true;
+}
+}
+return false;
+}
+static bool writeIconDirEntry(QIODevice *iodev, const ICONDIRENTRY &iconEntry)
+{
+if (iodev) {
+uchar tmp[ICONDIRENTRY_SIZE];
+tmp[0] = iconEntry.bWidth;
+tmp[1] = iconEntry.bHeight;
+tmp[2] = iconEntry.bColorCount;
+tmp[3] = iconEntry.bReserved;
+qToLittleEndian<quint16>(iconEntry.wPlanes, &tmp[4]);
+qToLittleEndian<quint16>(iconEntry.wBitCount, &tmp[6]);
+qToLittleEndian<quint32>(iconEntry.dwBytesInRes, &tmp[8]);
+qToLittleEndian<quint32>(iconEntry.dwImageOffset, &tmp[12]);
+return (iodev->write((char*)tmp,  ICONDIRENTRY_SIZE) == ICONDIRENTRY_SIZE) ? true : false;
+}
+return false;
+}
+static bool readIconDir(QIODevice *iodev, ICONDIR *iconDir)
+{
+if (iodev) {
+uchar tmp[ICONDIR_SIZE];
+if (iodev->read((char*)tmp, ICONDIR_SIZE) == ICONDIR_SIZE) {
+iconDir->idReserved = qFromLittleEndian<quint16>(&tmp[0]);
+iconDir->idType = qFromLittleEndian<quint16>(&tmp[2]);
+iconDir->idCount = qFromLittleEndian<quint16>(&tmp[4]);
+return true;
+}
+}
+return false;
+}
+static bool writeIconDir(QIODevice *iodev, const ICONDIR &iconDir)
+{
+if (iodev) {
+uchar tmp[6];
+qToLittleEndian(iconDir.idReserved, tmp);
+qToLittleEndian(iconDir.idType, &tmp[2]);
+qToLittleEndian(iconDir.idCount, &tmp[4]);
+return (iodev->write((char*)tmp,  6) == 6) ? true : false;
+}
+return false;
+}
+static bool readBMPInfoHeader(QIODevice *iodev, BMP_INFOHDR *pHeader)
+{
+if (iodev) {
+uchar header[BMP_INFOHDR_SIZE];
+if (iodev->read((char*)header, BMP_INFOHDR_SIZE) == BMP_INFOHDR_SIZE) {
+pHeader->biSize = qFromLittleEndian<quint32>(&header[0]);
+pHeader->biWidth = qFromLittleEndian<quint32>(&header[4]);
+pHeader->biHeight = qFromLittleEndian<quint32>(&header[8]);
+pHeader->biPlanes = qFromLittleEndian<quint16>(&header[12]);
+pHeader->biBitCount = qFromLittleEndian<quint16>(&header[14]);
+pHeader->biCompression = qFromLittleEndian<quint32>(&header[16]);
+pHeader->biSizeImage = qFromLittleEndian<quint32>(&header[20]);
+pHeader->biXPelsPerMeter = qFromLittleEndian<quint32>(&header[24]);
+pHeader->biYPelsPerMeter = qFromLittleEndian<quint32>(&header[28]);
+pHeader->biClrUsed = qFromLittleEndian<quint32>(&header[32]);
+pHeader->biClrImportant = qFromLittleEndian<quint32>(&header[36]);
+return true;
+}
+}
+return false;
+}
+static bool writeBMPInfoHeader(QIODevice *iodev, const BMP_INFOHDR &header)
+{
+if (iodev) {
+uchar tmp[BMP_INFOHDR_SIZE];
+qToLittleEndian<quint32>(header.biSize, &tmp[0]);
+qToLittleEndian<quint32>(header.biWidth, &tmp[4]);
+qToLittleEndian<quint32>(header.biHeight, &tmp[8]);
+qToLittleEndian<quint16>(header.biPlanes, &tmp[12]);
+qToLittleEndian<quint16>(header.biBitCount, &tmp[14]);
+qToLittleEndian<quint32>(header.biCompression, &tmp[16]);
+qToLittleEndian<quint32>(header.biSizeImage, &tmp[20]);
+qToLittleEndian<quint32>(header.biXPelsPerMeter, &tmp[24]);
+qToLittleEndian<quint32>(header.biYPelsPerMeter, &tmp[28]);
+qToLittleEndian<quint32>(header.biClrUsed, &tmp[32]);
+qToLittleEndian<quint32>(header.biClrImportant, &tmp[36]);
+return (iodev->write((char*)tmp, BMP_INFOHDR_SIZE) == BMP_INFOHDR_SIZE) ? true : false;
+}
+return false;
+}
+ICOReader::ICOReader(QIODevice * iodevice)
+: iod(iodevice)
+, startpos(0)
+, headerRead(false)
+{
+}
+int ICOReader::count()
+{
+if (readHeader())
+return iconDir.idCount;
+return 0;
+}
+bool ICOReader::canRead(QIODevice *iodev)
+{
+bool isProbablyICO = false;
+if (iodev) {
+qint64 oldPos = iodev->pos();
+ICONDIR ikonDir;
+if (readIconDir(iodev, &ikonDir)) {
+qint64 readBytes = ICONDIR_SIZE;
+if (readIconDirEntry(iodev, &ikonDir.idEntries[0])) {
+readBytes += ICONDIRENTRY_SIZE;
+// ICO format does not have a magic identifier, so we read 6 different values, which will hopefully be enough to identify the file.
+if (   ikonDir.idReserved == 0
+&& ikonDir.idType == 1
+&& ikonDir.idEntries[0].bReserved == 0
+&& ikonDir.idEntries[0].wPlanes <= 1
+&& ikonDir.idEntries[0].wBitCount <= 32     // Bits per pixel
+&& ikonDir.idEntries[0].dwBytesInRes >= 40  // Must be over 40, since sizeof (infoheader) == 40
+) {
+isProbablyICO = true;
+}
+if (iodev->isSequential()) {
+// Our structs might be padded due to alignment, so we need to fetch each member before we ungetChar() !
+quint32 tmp = ikonDir.idEntries[0].dwImageOffset;
+iodev->ungetChar((tmp >> 24) & 0xff);
+iodev->ungetChar((tmp >> 16) & 0xff);
+iodev->ungetChar((tmp >>  8) & 0xff);
+iodev->ungetChar(tmp & 0xff);
+tmp = ikonDir.idEntries[0].dwBytesInRes;
+iodev->ungetChar((tmp >> 24) & 0xff);
+iodev->ungetChar((tmp >> 16) & 0xff);
+iodev->ungetChar((tmp >>  8) & 0xff);
+iodev->ungetChar(tmp & 0xff);
+tmp = ikonDir.idEntries[0].wBitCount;
+iodev->ungetChar((tmp >>  8) & 0xff);
+iodev->ungetChar(tmp & 0xff);
+tmp = ikonDir.idEntries[0].wPlanes;
+iodev->ungetChar((tmp >>  8) & 0xff);
+iodev->ungetChar(tmp & 0xff);
+iodev->ungetChar(ikonDir.idEntries[0].bReserved);
+iodev->ungetChar(ikonDir.idEntries[0].bColorCount);
+iodev->ungetChar(ikonDir.idEntries[0].bHeight);
+iodev->ungetChar(ikonDir.idEntries[0].bWidth);
+}
+}
+if (iodev->isSequential()) {
+// Our structs might be padded due to alignment, so we need to fetch each member before we ungetChar() !
+quint32 tmp = ikonDir.idCount;
+iodev->ungetChar((tmp >>  8) & 0xff);
+iodev->ungetChar(tmp & 0xff);
+tmp = ikonDir.idType;
+iodev->ungetChar((tmp >>  8) & 0xff);
+iodev->ungetChar(tmp & 0xff);
+tmp = ikonDir.idReserved;
+iodev->ungetChar((tmp >>  8) & 0xff);
+iodev->ungetChar(tmp & 0xff);
+}
+}
+if (!iodev->isSequential()) iodev->seek(oldPos);
+}
+return isProbablyICO;
+}
+bool ICOReader::readHeader()
+{
+if (iod && !headerRead) {
+startpos = iod->pos();
+if (readIconDir(iod, &iconDir)) {
+if (iconDir.idReserved == 0 || iconDir.idType == 1)
+headerRead = true;
+}
+}
+return headerRead;
+}
+bool ICOReader::readIconEntry(int index, ICONDIRENTRY *iconEntry)
+{
+if (iod) {
+if (iod->seek(startpos + ICONDIR_SIZE + (index * ICONDIRENTRY_SIZE))) {
+return readIconDirEntry(iod, iconEntry);
+}
+}
+return false;
+}
+bool ICOReader::readBMPHeader(quint32 imageOffset, BMP_INFOHDR * header)
+{
+if (iod) {
+if (iod->seek(startpos + imageOffset)) {
+if (readBMPInfoHeader(iod, header)) {
+return TRUE;
+}
+}
+}
+return FALSE;
+}
+void ICOReader::findColorInfo(QImage & image)
+{
+if (icoAttrib.ncolors > 0) {                // set color table
+readColorTable(image);
+} else if (icoAttrib.nbits == 16) { // don't support RGB values for 15/16 bpp
+image = QImage();
+}
+}
+void ICOReader::readColorTable(QImage & image)
+{
+if (iod) {
+image.setNumColors(icoAttrib.ncolors);
+uchar rgb[4];
+for (int i=0; i<icoAttrib.ncolors; i++) {
+if (iod->read((char*)rgb, 4) != 4) {
+image = QImage();
+break;
+}
+image.setColor(i, qRgb(rgb[2],rgb[1],rgb[0]));
+}
+} else {
+image = QImage();
+}
+}
+void ICOReader::readBMP(QImage & image)
+{
+if (icoAttrib.nbits == 1) {                // 1 bit BMP image
+read1BitBMP(image);
+} else if (icoAttrib.nbits == 4) {            // 4 bit BMP image
+read4BitBMP(image);
+} else if (icoAttrib.nbits == 8) {
+read8BitBMP(image);
+} else if (icoAttrib.nbits == 16 || icoAttrib.nbits == 24 || icoAttrib.nbits == 32 ) { // 16,24,32 bit BMP image
+read16_24_32BMP(image);
+}
+}
+/**
+* NOTE: A 1 bit BMP is only flipped vertically, and not horizontally like all other color depths!
+* (This is the same with the bitmask)
+*
+*/
+void ICOReader::read1BitBMP(QImage & image)
+{
+if (iod) {
+int h = image.height();
+int bpl = image.bytesPerLine();
+while (--h >= 0) {
+if (iod->read((char*)image.scanLine(h),bpl) != bpl) {
+image = QImage();
+break;
+}
+}
+} else {
+image = QImage();
+}
+}
+void ICOReader::read4BitBMP(QImage & image)
+{
+if (iod) {
+int h = icoAttrib.h;
+int buflen = ((icoAttrib.w+7)/8)*4;
+uchar *buf = new uchar[buflen];
+Q_CHECK_PTR(buf);
+while (--h >= 0) {
+if (iod->read((char*)buf,buflen) != buflen) {
+image = QImage();
+break;
+}
+register uchar *p = image.scanLine(h);
+uchar *b = buf;
+for (int i=0; i<icoAttrib.w/2; i++) {   // convert nibbles to bytes
+*p++ = *b >> 4;
+*p++ = *b++ & 0x0f;
+}
+if (icoAttrib.w & 1)                    // the last nibble
+*p = *b >> 4;
+}
+delete [] buf;
+} else {
+image = QImage();
+}
+}
+void ICOReader::read8BitBMP(QImage & image)
+{
+if (iod) {
+int h = icoAttrib.h;
+int bpl = image.bytesPerLine();
+while (--h >= 0) {
+if (iod->read((char *)image.scanLine(h), bpl) != bpl) {
+image = QImage();
+break;
+}
+}
+} else {
+image = QImage();
+}
+}
+void ICOReader::read16_24_32BMP(QImage & image)
+{
+if (iod) {
+int h = icoAttrib.h;
+register QRgb *p;
+QRgb  *end;
+uchar *buf = new uchar[image.bytesPerLine()];
+int    bpl = ((icoAttrib.w*icoAttrib.nbits+31)/32)*4;
+uchar *b;
+while (--h >= 0) {
+p = (QRgb *)image.scanLine(h);
+end = p + icoAttrib.w;
+if (iod->read((char *)buf, bpl) != bpl) {
+image = QImage();
+break;
+}
+b = buf;
+while (p < end) {
+if (icoAttrib.nbits == 24)
+*p++ = qRgb(*(b+2), *(b+1), *b);
+else if (icoAttrib.nbits == 32)
+*p++ = qRgba(*(b+2), *(b+1), *b, *(b+3));
+b += icoAttrib.nbits/8;
+}
+}
+delete[] buf;
+} else {
+image = QImage();
+}
+}
+QImage ICOReader::iconAt(int index)
+{
+QImage img;
+if (count() > index) { // forces header to be read
+ICONDIRENTRY iconEntry;
+if (readIconEntry(index, &iconEntry)) {
+static const uchar pngMagicData[] = { 137, 80, 78, 71, 13, 10, 26, 10 };
+iod->seek(iconEntry.dwImageOffset);
+const QByteArray pngMagic = QByteArray::fromRawData((char*)pngMagicData, sizeof(pngMagicData));
+const bool isPngImage = (iod->read(pngMagic.size()) == pngMagic);
+if (isPngImage) {
+iod->seek(iconEntry.dwImageOffset);
+return QImage::fromData(iod->read(iconEntry.dwBytesInRes), "png");
+}
+BMP_INFOHDR header;
+if (readBMPHeader(iconEntry.dwImageOffset, &header)) {
+icoAttrib.nbits = header.biBitCount ? header.biBitCount : iconEntry.wBitCount;
+switch (icoAttrib.nbits) {
+case 32:
+case 24:
+case 16:
+icoAttrib.depth = 32;
+break;
+case 8:
+case 4:
+icoAttrib.depth = 8;
+break;
+default:
+icoAttrib.depth = 1;
+}
+if (icoAttrib.depth == 32)                // there's no colormap
+icoAttrib.ncolors = 0;
+else                    // # colors used
+icoAttrib.ncolors = header.biClrUsed ? header.biClrUsed : 1 << icoAttrib.nbits;
+icoAttrib.w = iconEntry.bWidth;
+icoAttrib.h = iconEntry.bHeight;
+QImage::Format format = QImage::Format_ARGB32;
+if (icoAttrib.nbits == 24)
+format = QImage::Format_RGB32;
+else if (icoAttrib.ncolors == 2)
+format = QImage::Format_Mono;
+else if (icoAttrib.ncolors > 0)
+format = QImage::Format_Indexed8;
+QImage image(icoAttrib.w, icoAttrib.h, format);
+if (!image.isNull()) {
+findColorInfo(image);
+if (!image.isNull()) {
+readBMP(image);
+if (!image.isNull()) {
+QImage mask(image.width(), image.height(), QImage::Format_Mono);
+if (!mask.isNull()) {
+mask.setNumColors(2);
+mask.setColor(0, qRgba(255,255,255,0xff));
+mask.setColor(1, qRgba(0  ,0  ,0  ,0xff));
+read1BitBMP(mask);
+if (!mask.isNull()) {
+img = QImage(image.width(), image.height(), QImage::Format_ARGB32 );
+img = image;
+img.setAlphaChannel(mask);
+// (Luckily, it seems that setAlphaChannel() does not ruin the alpha values
+// of partially transparent pixels in those icons that have that)
+}
+}
+}
+}
+}
+}
+}
+}
+return img;
+}
+/*!
+Reads all the icons from the given \a device, and returns them as
+a list of QImage objects.
+Each image has an alpha channel that represents the mask from the
+corresponding icon.
+\sa write()
+*/
+QList<QImage> ICOReader::read(QIODevice * device)
+{
+QList<QImage> images;
+ICOReader reader(device);
+for (int i = 0; i < reader.count(); i++)
+images += reader.iconAt(i);
+return images;
+}
+/*!
+Writes all the QImages in the \a images list to the given \a
+device. Returns true if the images are written successfully;
+otherwise returns false.
+The first image in the list is stored as the first icon in the
+device, and is therefore used as the default icon by applications.
+The alpha channel of each image is converted to a mask for each
+corresponding icon.
+\sa read()
+*/
+bool ICOReader::write(QIODevice * device, const QList<QImage> & images)
+{
+bool retValue = false;
+if (images.count()) {
+qint64 origOffset = device->pos();
+ICONDIR id;
+id.idReserved = 0;
+id.idType = 1;
+id.idCount = images.count();
+ICONDIRENTRY * entries = new ICONDIRENTRY[id.idCount];
+BMP_INFOHDR * bmpHeaders = new BMP_INFOHDR[id.idCount];
+QByteArray * imageData = new QByteArray[id.idCount];
+for (int i=0; i<id.idCount; i++) {
+QImage image = images[i];
+// Scale down the image if it is larger than 128 pixels in either width or height
+if (image.width() > 128 || image.height() > 128)
+{
+image = image.scaled(128, 128, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+}
+QImage maskImage(image.width(), image.height(), QImage::Format_Mono);
+image = image.convertToFormat(QImage::Format_ARGB32);
+if (image.hasAlphaChannel()) {
+maskImage = image.createAlphaMask();
+} else {
+maskImage.fill(0xff);
+}
+maskImage = maskImage.convertToFormat(QImage::Format_Mono);
+int    nbits = 32;
+int    bpl_bmp = ((image.width()*nbits+31)/32)*4;
+entries[i].bColorCount = 0;
+entries[i].bReserved = 0;
+entries[i].wBitCount = nbits;
+entries[i].bHeight = image.height();
+entries[i].bWidth = image.width();
+entries[i].dwBytesInRes = BMP_INFOHDR_SIZE + (bpl_bmp * image.height())
++ (maskImage.bytesPerLine() * maskImage.height());
+entries[i].wPlanes = 1;
+if (i == 0)
+entries[i].dwImageOffset = origOffset + ICONDIR_SIZE
++ (id.idCount * ICONDIRENTRY_SIZE);
+else
+entries[i].dwImageOffset = entries[i-1].dwImageOffset + entries[i-1].dwBytesInRes;
+bmpHeaders[i].biBitCount = entries[i].wBitCount;
+bmpHeaders[i].biClrImportant = 0;
+bmpHeaders[i].biClrUsed = entries[i].bColorCount;
+bmpHeaders[i].biCompression = 0;
+bmpHeaders[i].biHeight = entries[i].bHeight * 2; // 2 is for the mask
+bmpHeaders[i].biPlanes = entries[i].wPlanes;
+bmpHeaders[i].biSize = BMP_INFOHDR_SIZE;
+bmpHeaders[i].biSizeImage = entries[i].dwBytesInRes - BMP_INFOHDR_SIZE;
+bmpHeaders[i].biWidth = entries[i].bWidth;
+bmpHeaders[i].biXPelsPerMeter = 0;
+bmpHeaders[i].biYPelsPerMeter = 0;
+QBuffer buffer(&imageData[i]);
+buffer.open(QIODevice::WriteOnly);
+uchar *buf = new uchar[bpl_bmp];
+uchar *b;
+memset( buf, 0, bpl_bmp );
+int y;
+for (y = image.height() - 1; y >= 0; y--) {    // write the image bits
+// 32 bits
+QRgb *p   = (QRgb *)image.scanLine(y);
+QRgb *end = p + image.width();
+b = buf;
+int x = 0;
+while (p < end) {
+*b++ = qBlue(*p);
+*b++ = qGreen(*p);
+*b++ = qRed(*p);
+*b++ = qAlpha(*p);
+if (qAlpha(*p) > 0)   // Even mostly transparent pixels must not be masked away
+maskImage.setPixel(x, y, Qt::color1);  // (i.e. createAlphaMask() takes away too much)
+p++;
+x++;
+}
+buffer.write((char*)buf, bpl_bmp);
+}
+delete[] buf;
+maskImage.invertPixels();   // seems as though it needs this
+// NOTE! !! The mask is only flipped vertically - not horizontally !!
+for (y = maskImage.height() - 1; y >= 0; y--)
+buffer.write((char*)maskImage.scanLine(y), maskImage.bytesPerLine());
+}
+if (writeIconDir(device, id)) {
+int i;
+bool bOK = true;
+for (i = 0; i < id.idCount && bOK; i++) {
+bOK = writeIconDirEntry(device, entries[i]);
+}
+if (bOK) {
+for (i = 0; i < id.idCount && bOK; i++) {
+bOK = writeBMPInfoHeader(device, bmpHeaders[i]);
+bOK &= (device->write(imageData[i]) == (int) imageData[i].size());
+}
+retValue = bOK;
+}
+}
+delete [] entries;
+delete [] bmpHeaders;
+delete [] imageData;
+}
+return retValue;
+}
+/*!
+Constructs an instance of QtIcoHandler initialized to use \a device.
+*/
+QtIcoHandler::QtIcoHandler(QIODevice *device)
+{
+m_currentIconIndex = 0;
+setDevice(device);
+m_pICOReader = new ICOReader(device);
+}
+/*!
+Destructor for QtIcoHandler.
+*/
+QtIcoHandler::~QtIcoHandler()
+{
+delete m_pICOReader;
+}
+/*!
+* Verifies if some values (magic bytes) are set as expected in the header of the file.
+* If the magic bytes were found, it is assumed that the QtIcoHandler can read the file.
+*
+*/
+bool QtIcoHandler::canRead() const
+{
+bool bCanRead = false;
+QIODevice *device = QImageIOHandler::device();
+if (device) {
+bCanRead = ICOReader::canRead(device);
+if (bCanRead)
+setFormat("ico");
+} else {
+qWarning("QtIcoHandler::canRead() called with no device");
+}
+return bCanRead;
+}
+/*! This static function is used by the plugin code, and is provided for convenience only.
+\a device must be an opened device with pointing to the start of the header data of the ICO file.
+*/
+bool QtIcoHandler::canRead(QIODevice *device)
+{
+Q_ASSERT(device);
+return ICOReader::canRead(device);
+}
+/*! \reimp
+*/
+bool QtIcoHandler::read(QImage *image)
+{
+bool bSuccess = false;
+QImage img = m_pICOReader->iconAt(m_currentIconIndex);
+// Make sure we only write to \a image when we succeed.
+if (!img.isNull()) {
+bSuccess = true;
+*image = img;
+}
+return bSuccess;
+}
+/*! \reimp
+*/
+bool QtIcoHandler::write(const QImage &image)
+{
+QIODevice *device = QImageIOHandler::device();
+QList<QImage> imgs;
+imgs.append(image);
+return ICOReader::write(device, imgs);
+}
+/*!
+* Return the common identifier of the format.
+* For ICO format this will return "ico".
+*/
+QByteArray QtIcoHandler::name() const
+{
+return "ico";
+}
+/*! \reimp
+*/
+int QtIcoHandler::imageCount() const
+{
+return m_pICOReader->count();
+}
+/*! \reimp
+*/
+bool QtIcoHandler::jumpToImage(int imageNumber)
+{
+if (imageNumber < imageCount()) {
+m_currentIconIndex = imageNumber;
+}
+return (imageNumber < imageCount()) ? true : false;
+}
+/*! \reimp
+*/
+bool QtIcoHandler::jumpToNextImage()
+{
+return jumpToImage(m_currentIconIndex + 1);
+}

changeset 0	1918ee327afb
child 3	41300fa6a67c