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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:24:48 +0000 |
commit | cca66b9ec4e494c1d919bff0f71a820d8afab1fa (patch) | |
tree | 146f39ded1c938019e1ed42d30923c2ac9e86789 /src/trace/imagemap-gdk.cpp | |
parent | Initial commit. (diff) | |
download | inkscape-upstream.tar.xz inkscape-upstream.zip |
Adding upstream version 1.2.2.upstream/1.2.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/trace/imagemap-gdk.cpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/trace/imagemap-gdk.cpp b/src/trace/imagemap-gdk.cpp new file mode 100644 index 0000000..10fe27e --- /dev/null +++ b/src/trace/imagemap-gdk.cpp @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** @file + * TODO: insert short description here + *//* + * Authors: see git history + * + * Copyright (C) 2018 Authors + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ +#include <cstdlib> + +#include "imagemap-gdk.h" + + +/*######################################################################### +## G R A Y M A P +#########################################################################*/ + +GrayMap *gdkPixbufToGrayMap(GdkPixbuf *buf) +{ + if (!buf) + return nullptr; + + int width = gdk_pixbuf_get_width(buf); + int height = gdk_pixbuf_get_height(buf); + guchar *pixdata = gdk_pixbuf_get_pixels(buf); + int rowstride = gdk_pixbuf_get_rowstride(buf); + int n_channels = gdk_pixbuf_get_n_channels(buf); + + GrayMap *grayMap = GrayMapCreate(width, height); + if (!grayMap) + return nullptr; + + //### Fill in the odd cells with RGB values + int x,y; + int row = 0; + for (y=0 ; y<height ; y++) + { + guchar *p = pixdata + row; + for (x=0 ; x<width ; x++) + { + int alpha = (int)p[3]; + int white = 3 * (255-alpha); + unsigned long sample = (int)p[0] + (int)p[1] +(int)p[2]; + unsigned long bright = sample * alpha / 256 + white; + grayMap->setPixel(grayMap, x, y, bright); + p += n_channels; + } + row += rowstride; + } + + return grayMap; +} + +GdkPixbuf *grayMapToGdkPixbuf(GrayMap *grayMap) +{ + if (!grayMap) + return nullptr; + + guchar *pixdata = (guchar *) + malloc(sizeof(guchar) * grayMap->width * grayMap->height * 3); + if (!pixdata) + { + g_warning("grayMapToGdkPixbuf: can not allocate memory for conversion."); + return nullptr; + } + + int n_channels = 3; + int rowstride = grayMap->width * 3; + + GdkPixbuf *buf = gdk_pixbuf_new_from_data(pixdata, GDK_COLORSPACE_RGB, + 0, 8, grayMap->width, grayMap->height, + rowstride, (GdkPixbufDestroyNotify)g_free, nullptr); + + //### Fill in the odd cells with RGB values + int x,y; + int row = 0; + for (y=0 ; y<grayMap->height ; y++) + { + guchar *p = pixdata + row; + for (x=0 ; x<grayMap->width ; x++) + { + unsigned long pix = grayMap->getPixel(grayMap, x, y) / 3; + p[0] = p[1] = p[2] = (guchar)(pix & 0xff); + p += n_channels; + } + row += rowstride; + } + + return buf; +} + + +/*######################################################################### +## R G B M A P +#########################################################################*/ + +RgbMap *gdkPixbufToRgbMap(GdkPixbuf *buf) +{ + if (!buf) + return nullptr; + + int width = gdk_pixbuf_get_width(buf); + int height = gdk_pixbuf_get_height(buf); + guchar *pixdata = gdk_pixbuf_get_pixels(buf); + int rowstride = gdk_pixbuf_get_rowstride(buf); + int n_channels = gdk_pixbuf_get_n_channels(buf); + + RgbMap *rgbMap = RgbMapCreate(width, height); + if (!rgbMap) + return nullptr; + + //### Fill in the cells with RGB values + int x,y; + int row = 0; + for (y=0 ; y<height ; y++) + { + guchar *p = pixdata + row; + for (x=0 ; x<width ; x++) + { + int alpha = (int)p[3]; + int white = 255 - alpha; + int r = (int)p[0]; r = r * alpha / 256 + white; + int g = (int)p[1]; g = g * alpha / 256 + white; + int b = (int)p[2]; b = b * alpha / 256 + white; + + rgbMap->setPixel(rgbMap, x, y, r, g, b); + p += n_channels; + } + row += rowstride; + } + + return rgbMap; +} + + + +/*######################################################################### +## I N D E X E D M A P +#########################################################################*/ + + +GdkPixbuf *indexedMapToGdkPixbuf(IndexedMap *iMap) +{ + if (!iMap) + return nullptr; + + guchar *pixdata = (guchar *) + malloc(sizeof(guchar) * iMap->width * iMap->height * 3); + if (!pixdata) + { + g_warning("indexedMapToGdkPixbuf: can not allocate memory for conversion."); + return nullptr; + } + + int n_channels = 3; + int rowstride = iMap->width * 3; + + GdkPixbuf *buf = gdk_pixbuf_new_from_data(pixdata, GDK_COLORSPACE_RGB, + 0, 8, iMap->width, iMap->height, + rowstride, (GdkPixbufDestroyNotify)g_free, nullptr); + + //### Fill in the cells with RGB values + int x,y; + int row = 0; + for (y=0 ; y<iMap->height ; y++) + { + guchar *p = pixdata + row; + for (x=0 ; x<iMap->width ; x++) + { + RGB rgb = iMap->getPixelValue(iMap, x, y); + p[0] = rgb.r & 0xff; + p[1] = rgb.g & 0xff; + p[2] = rgb.b & 0xff; + p += n_channels; + } + row += rowstride; + } + + return buf; +} + +/*######################################################################### +## E N D O F F I L E +#########################################################################*/ |