diff options
Diffstat (limited to 'src/gui/image/qimage.cpp')
| -rw-r--r-- | src/gui/image/qimage.cpp | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp index 21ab40c..571ef9d 100644 --- a/src/gui/image/qimage.cpp +++ b/src/gui/image/qimage.cpp @@ -546,11 +546,7 @@ bool QImageData::checkForAlphaPixels() const Each pixel stored in a QImage is represented by an integer. The size of the integer varies depending on the format. QImage supports several image formats described by the \l Format - enum. The monochrome (1-bit), 8-bit and 32-bit images are - available in all versions of Qt. In addition Qt for Embedded Linux - also supports 2-bit, 4-bit, and 16-bit images. For more information - about the Qt Extended specific formats, see the documentation of the \l - Format enum. + enum. Monochrome images are stored using 1-bit indexes into a color table with at most two colors. There are two different types of @@ -707,9 +703,20 @@ bool QImageData::checkForAlphaPixels() const packed with the most significant bit (MSB) first. \value Format_MonoLSB The image is stored using 1-bit per pixel. Bytes are packed with the less significant bit (LSB) first. - \value Format_Indexed8 The image is stored using 8-bit indexes into a colormap. + + \value Format_Indexed8 The image is stored using 8-bit indexes + into a colormap. \warning Drawing into a + QImage with Indexed8 format is not + supported. + \value Format_RGB32 The image is stored using a 32-bit RGB format (0xffRRGGBB). - \value Format_ARGB32 The image is stored using a 32-bit ARGB format (0xAARRGGBB). + + \value Format_ARGB32 The image is stored using a 32-bit ARGB + format (0xAARRGGBB). \warning Do not + render into ARGB32 images using + QPainter. Format_ARGB32_Premultiplied is + significantly faster. + \value Format_ARGB32_Premultiplied The image is stored using a premultiplied 32-bit ARGB format (0xAARRGGBB), i.e. the red, green, and blue channels are multiplied @@ -718,7 +725,9 @@ bool QImageData::checkForAlphaPixels() const undefined.) Certain operations (such as image composition using alpha blending) are faster using premultiplied ARGB32 than with plain ARGB32. + \value Format_RGB16 The image is stored using a 16-bit RGB format (5-6-5). + \value Format_ARGB8565_Premultiplied The image is stored using a premultiplied 24-bit ARGB format (8-5-6-5). \value Format_RGB666 The image is stored using a 24-bit RGB format (6-6-6). |