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
+#########################################################################*/