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// 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 <cassert>
#include "imagemap-gdk.h"
namespace Inkscape {
namespace Trace {
GrayMap gdkPixbufToGrayMap(Glib::RefPtr<Gdk::Pixbuf> const &buf)
{
int width = buf->get_width();
int height = buf->get_height();
int rowstride = buf->get_rowstride();
int nchannels = buf->get_n_channels();
auto data = buf->get_pixels();
auto map = GrayMap(width, height);
for (int y = 0; y < height; y++) {
auto p = data + rowstride * y;
for (int x = 0; x < width; x++) {
int alpha = nchannels == 3 ? 255 : 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;
map.setPixel(x, y, bright);
p += nchannels;
}
}
return map;
}
Glib::RefPtr<Gdk::Pixbuf> grayMapToGdkPixbuf(GrayMap const &map)
{
auto buf = Gdk::Pixbuf::create(Gdk::COLORSPACE_RGB, false, 8, map.width, map.height);
int rowstride = buf->get_rowstride();
int nchannels = buf->get_n_channels();
auto data = buf->get_pixels();
for (int y = 0; y < map.height; y++) {
auto p = data + rowstride * y;
for (int x = 0; x < map.width; x++) {
unsigned long pix = map.getPixel(x, y) / 3;
p[0] = p[1] = p[2] = pix & 0xff;
p += nchannels;
}
}
return buf;
}
RgbMap gdkPixbufToRgbMap(Glib::RefPtr<Gdk::Pixbuf> const &buf)
{
int width = buf->get_width();
int height = buf->get_height();
int rowstride = buf->get_rowstride();
int nchannels = buf->get_n_channels();
auto data = buf->get_pixels();
auto map = RgbMap(width, height);
for (int y = 0; y < height; y++) {
auto p = data + rowstride * y;
for (int x = 0; x < width; x++) {
int alpha = nchannels == 3 ? 255 : p[3];
int white = 255 - alpha;
unsigned char r = (int)p[0] * alpha / 256 + white;
unsigned char g = (int)p[1] * alpha / 256 + white;
unsigned char b = (int)p[2] * alpha / 256 + white;
map.setPixel(x, y, {r, g, b});
p += nchannels;
}
}
return map;
}
Glib::RefPtr<Gdk::Pixbuf> indexedMapToGdkPixbuf(IndexedMap const &map)
{
auto buf = Gdk::Pixbuf::create(Gdk::COLORSPACE_RGB, false, 8, map.width, map.height);
auto data = buf->get_pixels();
int rowstride = buf->get_rowstride();
int nchannels = buf->get_n_channels();
for (int y = 0; y < map.height; y++) {
auto p = data + rowstride * y;
for (int x = 0; x < map.width; x++) {
auto rgb = map.getPixelValue(x, y);
p[0] = rgb.r & 0xff;
p[1] = rgb.g & 0xff;
p[2] = rgb.b & 0xff;
p += nchannels;
}
}
return buf;
}
} // namespace Trace
} // namespace Inkscape
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