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Kovid Goyal 2016-05-09 09:30:36 +05:30
parent 6099728e00
commit 8a5eebf409
1 changed files with 4 additions and 1 deletions
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5
src/calibre/utils/imageops/quantize.cpp
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@ -3,7 +3,8 @@
* Copyright (C) 2016 Kovid Goyal <kovid at kovidgoyal.net> * Copyright (C) 2016 Kovid Goyal <kovid at kovidgoyal.net>
* *
* octree based image quantization. * octree based image quantization.
* Based on https://www.microsoft.com/msj/archive/S3F1.aspx * See https://www.microsoft.com/msj/archive/S3F1.aspx for a simple to follow
* writeup on this algorithm
* *
* Distributed under terms of the GPL3 license. * Distributed under terms of the GPL3 license.
*/ */
@ -212,6 +213,7 @@ public:
}; };
// Image Dithering {{{
static inline void propagate_error(QVector<DoublePixel> &error_line, int c, unsigned char mult, DoublePixel &error) { static inline void propagate_error(QVector<DoublePixel> &error_line, int c, unsigned char mult, DoublePixel &error) {
error_line[c].red += error.red * mult; error_line[c].red += error.red * mult;
error_line[c].green += error.green * mult; error_line[c].green += error.green * mult;
@ -263,6 +265,7 @@ static void dither_image(const QImage &img, QImage &ans, QVector<QRgb> &color_ta
} }
} }
} }
// }}}
QImage quantize(const QImage &image, unsigned int maximum_colors, bool dither) { QImage quantize(const QImage &image, unsigned int maximum_colors, bool dither) {
ScopedGILRelease PyGILRelease; ScopedGILRelease PyGILRelease;