src/gui/render.c

   1 #include <assert.h>
   2 #include <gtk/gtk.h>
   3
   4 #include "render.h"
   5 #include "image.h"
   6
   7 /* LBX images can have up to three palettes, with each superseding the last. */
   8 struct lbx_colour palette_external[256];
   9 struct lbx_colour palette_internal[256];
  10 struct lbx_colour palette_override[256];
  11
  12 static void get_colour(unsigned char index, unsigned char out[static 4])
  13 {
  14         struct lbx_colour *colour;
  15
  16         if (palette_override[index].active)
  17                 colour = palette_override + index;
  18         else if (palette_internal[index].active)
  19                 colour = palette_internal + index;
  20         else if (palette_external[index].active)
  21                 colour = palette_external + index;
  22         else
  23                 colour = &(struct lbx_colour) { .red = 0xff, .blue = 0xff };
  24
  25         out[0] = colour->red;
  26         out[1] = colour->green;
  27         out[2] = colour->blue;
  28         out[3] = -1; /* opaque */
  29 }
  30
  31 int render_to_pixbuf(LBX_IMG *image, GdkPixbuf *pixbuf, unsigned frame)
  32 {
  33         unsigned char **framedata, **framemask, *outbuf;
  34         struct lbx_imginfo info;
  35         unsigned stride;
  36
  37         lbximg_getinfo(image, &info);
  38         assert(info.width  == gdk_pixbuf_get_width(pixbuf));
  39         assert(info.height == gdk_pixbuf_get_height(pixbuf));
  40
  41         framedata = lbximg_getframe(image, frame);
  42         g_return_val_if_fail(framedata, -1);
  43         framemask = lbximg_getmask(image);
  44
  45         outbuf = gdk_pixbuf_get_pixels(pixbuf);
  46         stride = gdk_pixbuf_get_rowstride(pixbuf);
  47
  48         for (unsigned i = 0; i < info.height; i++) {
  49                 unsigned char (*px)[4] = (void *)(outbuf + i*stride);
  50
  51                 for (unsigned j = 0; j < info.width; j++) {
  52                         if (framemask[i][j])
  53                                 get_colour(framedata[i][j], px[j]);
  54                         else
  55                                 px[j][3] = 0; /* transparent */
  56                 }
  57         }
  58
  59         return 0;
  60 }