Changeset bea947f in mainline for uspace/lib/guigfx/src/canvas.c

Timestamp:

2020-05-24T17:59:02Z (4 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

b3b00b6

Parents:

ef20a91

Message:

Implement bitmap color key to allow transparent cursor background

This seems to be the simplest solution of them all. It will work
on any bit depth except 1 bit per pixel (monochrome), where we would
need to extend the bitmap with a bit mask instead.

File:

• uspace/lib/guigfx/src/canvas.c (modified) (3 diffs)

uspace/lib/guigfx/src/canvas.c

@@ -197 +197 @@
         gfx_coord2_subtract(&params->rect.p1, &params->rect.p0, &dim);
         cbm->rect = params->rect;
+        cbm->flags = params->flags;
+        cbm->key_color = params->key_color;
 
         if (alloc == NULL) {
@@ -259 +261 @@
         gfx_coord2_t offs;
         gfx_coord2_t dim;
+        gfx_coord_t x, y;
+        pixel_t pixel;
 
         if (srect0 != NULL)
@@ -288 +292 @@
             PIXELMAP_EXTEND_TRANSPARENT_BLACK);
 
-        drawctx_t drawctx;
-        drawctx_init(&drawctx, cbm->cgc->surface);
-
-        drawctx_set_source(&drawctx, &source);
-        drawctx_transfer(&drawctx, drect.p0.x, drect.p0.y, dim.x, dim.y);
+        if ((cbm->flags & bmpf_color_key) == 0) {
+                drawctx_t drawctx;
+                drawctx_init(&drawctx, cbm->cgc->surface);
+
+                drawctx_set_source(&drawctx, &source);
+                drawctx_transfer(&drawctx, drect.p0.x, drect.p0.y, dim.x, dim.y);
+        } else {
+                for (y = drect.p0.y; y < drect.p1.y; y++) {
+                        for (x = drect.p0.x; x < drect.p1.x; x++) {
+                                pixel = source_determine_pixel(&source, x, y);
+                                if (pixel != cbm->key_color) {
+                                        surface_put_pixel(cbm->cgc->surface,
+                                            x, y, pixel);
+                                }
+                        }
+                }
+        }
 
         update_canvas(cbm->cgc->canvas, cbm->cgc->surface);