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-rw-r--r--src/plugins/imageformats/tiff/qtiffhandler.cpp155
1 files changed, 95 insertions, 60 deletions
diff --git a/src/plugins/imageformats/tiff/qtiffhandler.cpp b/src/plugins/imageformats/tiff/qtiffhandler.cpp
index 3669be7..9538745 100644
--- a/src/plugins/imageformats/tiff/qtiffhandler.cpp
+++ b/src/plugins/imageformats/tiff/qtiffhandler.cpp
@@ -192,7 +192,14 @@ bool QTiffHandler::read(QImage *image)
return false;
}
- if (photometric == PHOTOMETRIC_MINISBLACK || photometric == PHOTOMETRIC_MINISWHITE) {
+ uint16 bitPerSample;
+ if (!TIFFGetField(tiff, TIFFTAG_BITSPERSAMPLE, &bitPerSample)) {
+ TIFFClose(tiff);
+ return false;
+ }
+
+ bool grayscale = photometric == PHOTOMETRIC_MINISBLACK || photometric == PHOTOMETRIC_MINISWHITE;
+ if (grayscale && bitPerSample == 1) {
if (image->size() != QSize(width, height) || image->format() != QImage::Format_Mono)
*image = QImage(width, height, QImage::Format_Mono);
QVector<QRgb> colortable(2);
@@ -208,42 +215,43 @@ bool QTiffHandler::read(QImage *image)
if (!image->isNull()) {
for (uint32 y=0; y<height; ++y) {
if (TIFFReadScanline(tiff, image->scanLine(y), y, 0) < 0) {
- TIFFClose(tiff);
- return false;
+ TIFFClose(tiff);
+ return false;
}
}
}
} else {
- uint16 bitPerSample;
- if (!TIFFGetField(tiff, TIFFTAG_BITSPERSAMPLE, &bitPerSample)) {
- TIFFClose(tiff);
- return false;
- }
- if (photometric == PHOTOMETRIC_PALETTE && bitPerSample == 8) {
+ if ((grayscale || photometric == PHOTOMETRIC_PALETTE) && bitPerSample == 8) {
if (image->size() != QSize(width, height) || image->format() != QImage::Format_Indexed8)
*image = QImage(width, height, QImage::Format_Indexed8);
if (!image->isNull()) {
- // create the color table
const uint16 tableSize = 256;
- uint16 *redTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));
- uint16 *greenTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));
- uint16 *blueTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));
- if (!redTable || !greenTable || !blueTable) {
- TIFFClose(tiff);
- return false;
- }
- if (!TIFFGetField(tiff, TIFFTAG_COLORMAP, &redTable, &greenTable, &blueTable)) {
- TIFFClose(tiff);
- return false;
- }
-
QVector<QRgb> qtColorTable(tableSize);
- for (int i = 0; i<tableSize ;++i) {
- const int red = redTable[i] / 257;
- const int green = greenTable[i] / 257;
- const int blue = blueTable[i] / 257;
- qtColorTable[i] = qRgb(red, green, blue);
+ if (grayscale) {
+ for (int i = 0; i<tableSize; ++i) {
+ const int c = (photometric == PHOTOMETRIC_MINISBLACK) ? i : (255 - i);
+ qtColorTable[i] = qRgb(c, c, c);
+ }
+ } else {
+ // create the color table
+ uint16 *redTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));
+ uint16 *greenTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));
+ uint16 *blueTable = static_cast<uint16 *>(qMalloc(tableSize * sizeof(uint16)));
+ if (!redTable || !greenTable || !blueTable) {
+ TIFFClose(tiff);
+ return false;
+ }
+ if (!TIFFGetField(tiff, TIFFTAG_COLORMAP, &redTable, &greenTable, &blueTable)) {
+ TIFFClose(tiff);
+ return false;
+ }
+ for (int i = 0; i<tableSize ;++i) {
+ const int red = redTable[i] / 257;
+ const int green = greenTable[i] / 257;
+ const int blue = blueTable[i] / 257;
+ qtColorTable[i] = qRgb(red, green, blue);
+ }
}
image->setColorTable(qtColorTable);
@@ -371,6 +379,20 @@ bool QTiffHandler::read(QImage *image)
return true;
}
+static bool checkGrayscale(const QVector<QRgb> &colorTable)
+{
+ if (colorTable.size() != 256)
+ return false;
+
+ const bool increasing = (colorTable.at(0) == 0xff000000);
+ for (int i = 0; i < 256; ++i) {
+ if (increasing && colorTable.at(i) != qRgb(i, i, i)
+ || !increasing && colorTable.at(i) != qRgb(255 - i, 255 - i, 255 - i))
+ return false;
+ }
+ return true;
+}
+
bool QTiffHandler::write(const QImage &image)
{
if (!device()->isWritable())
@@ -425,7 +447,8 @@ bool QTiffHandler::write(const QImage &image)
if (image.colorTable().at(0) == 0xffffffff)
photometric = PHOTOMETRIC_MINISWHITE;
if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, photometric)
- || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_CCITTRLE)) {
+ || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_CCITTRLE)
+ || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 1)) {
TIFFClose(tiff);
return false;
}
@@ -450,43 +473,55 @@ bool QTiffHandler::write(const QImage &image)
}
TIFFClose(tiff);
} else if (format == QImage::Format_Indexed8) {
- if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE)
- || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS)
- || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 8)) {
- TIFFClose(tiff);
- return false;
- }
- //// write the color table
- // allocate the color tables
- uint16 *redTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));
- uint16 *greenTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));
- uint16 *blueTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));
- if (!redTable || !greenTable || !blueTable) {
- TIFFClose(tiff);
- return false;
- }
-
- // set the color table
const QVector<QRgb> colorTable = image.colorTable();
+ bool isGrayscale = checkGrayscale(colorTable);
+ if (isGrayscale) {
+ uint16 photometric = PHOTOMETRIC_MINISBLACK;
+ if (image.colorTable().at(0) == 0xffffffff)
+ photometric = PHOTOMETRIC_MINISWHITE;
+ if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, photometric)
+ || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS)
+ || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 8)) {
+ TIFFClose(tiff);
+ return false;
+ }
+ } else {
+ if (!TIFFSetField(tiff, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE)
+ || !TIFFSetField(tiff, TIFFTAG_COMPRESSION, compression == NoCompression ? COMPRESSION_NONE : COMPRESSION_PACKBITS)
+ || !TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE, 8)) {
+ TIFFClose(tiff);
+ return false;
+ }
+ //// write the color table
+ // allocate the color tables
+ uint16 *redTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));
+ uint16 *greenTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));
+ uint16 *blueTable = static_cast<uint16 *>(qMalloc(256 * sizeof(uint16)));
+ if (!redTable || !greenTable || !blueTable) {
+ TIFFClose(tiff);
+ return false;
+ }
- const int tableSize = colorTable.size();
- Q_ASSERT(tableSize <= 256);
- for (int i = 0; i<tableSize; ++i) {
- const QRgb color = colorTable.at(i);
- redTable[i] = qRed(color) * 257;
- greenTable[i] = qGreen(color) * 257;
- blueTable[i] = qBlue(color) * 257;
- }
+ // set the color table
+ const int tableSize = colorTable.size();
+ Q_ASSERT(tableSize <= 256);
+ for (int i = 0; i<tableSize; ++i) {
+ const QRgb color = colorTable.at(i);
+ redTable[i] = qRed(color) * 257;
+ greenTable[i] = qGreen(color) * 257;
+ blueTable[i] = qBlue(color) * 257;
+ }
- const bool setColorTableSuccess = TIFFSetField(tiff, TIFFTAG_COLORMAP, redTable, greenTable, blueTable);
+ const bool setColorTableSuccess = TIFFSetField(tiff, TIFFTAG_COLORMAP, redTable, greenTable, blueTable);
- qFree(redTable);
- qFree(greenTable);
- qFree(blueTable);
+ qFree(redTable);
+ qFree(greenTable);
+ qFree(blueTable);
- if (!setColorTableSuccess) {
- TIFFClose(tiff);
- return false;
+ if (!setColorTableSuccess) {
+ TIFFClose(tiff);
+ return false;
+ }
}
//// write the data
generated by cgit v0.12 at 2024-11-15 19:51:17 (GMT)