Changeset bea947f in mainline for uspace/app/gfxdemo/gfxdemo.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/app/gfxdemo/gfxdemo.c (modified) (4 diffs)

uspace/app/gfxdemo/gfxdemo.c

@@ -215 +215 @@
 }
 
+/** Render circle to a bitmap.
+ *
+ * @param bitmap Bitmap
+ * @param w Bitmap width
+ * @param h Bitmap height
+ * @return EOK on success or an error code
+ */
+static errno_t bitmap_circle(gfx_bitmap_t *bitmap, gfx_coord_t w, gfx_coord_t h)
+{
+        int i, j;
+        int k;
+        pixelmap_t pixelmap;
+        gfx_bitmap_alloc_t alloc;
+        errno_t rc;
+
+        rc = gfx_bitmap_get_alloc(bitmap, &alloc);
+        if (rc != EOK)
+                return rc;
+
+        /* In absence of anything else, use pixelmap */
+        pixelmap.width = w;
+        pixelmap.height = h;
+        pixelmap.data = alloc.pixels;
+
+        for (i = 0; i < w; i++) {
+                for (j = 0; j < h; j++) {
+                        k = i * i + j * j;
+                        pixelmap_put_pixel(&pixelmap, i, j,
+                            k < w * w / 2 ? PIXEL(255, 0, 255, 0) :
+                            PIXEL(0, 255, 0, 255));
+                }
+        }
+
+        return EOK;
+}
+
 /** Run bitmap demo on a graphic context.
  *
@@ -329 +365 @@
         return rc;
 }
-
-/** Run demo loop on a graphic context.
+/** Run bitmap color key demo on a graphic context.
  *
  * @param gc Graphic context
@@ -336 +371 @@
  * @param h Height
  */
+static errno_t demo_bitmap_kc(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
+{
+        gfx_bitmap_t *bitmap;
+        gfx_bitmap_params_t params;
+        int i, j;
+        gfx_coord2_t offs;
+        errno_t rc;
+
+        rc = clear_scr(gc, w, h);
+        if (rc != EOK)
+                return rc;
+
+        params.rect.p0.x = 0;
+        params.rect.p0.y = 0;
+        params.rect.p1.x = 40;
+        params.rect.p1.y = 40;
+        params.flags = bmpf_color_key;
+        params.key_color = PIXEL(0, 255, 0, 255);
+
+        rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
+        if (rc != EOK)
+                return rc;
+
+        rc = bitmap_circle(bitmap, 40, 40);
+        if (rc != EOK)
+                goto error;
+
+        for (j = 0; j < 10; j++) {
+                for (i = 0; i < 10; i++) {
+                        offs.x = j * 20 + i * 20;
+                        offs.y = i * 20;
+
+                        rc = gfx_bitmap_render(bitmap, NULL, &offs);
+                        if (rc != EOK)
+                                goto error;
+                }
+
+                fibril_usleep(500 * 1000);
+
+                if (quit)
+                        break;
+        }
+
+        gfx_bitmap_destroy(bitmap);
+
+        return EOK;
+error:
+        gfx_bitmap_destroy(bitmap);
+        return rc;
+}
+
+/** Run demo loop on a graphic context.
+ *
+ * @param gc Graphic context
+ * @param w Width
+ * @param h Height
+ */
 static errno_t demo_loop(gfx_context_t *gc, gfx_coord_t w, gfx_coord_t h)
 {
@@ -350 +442 @@
 
                 rc = demo_bitmap2(gc, w, h);
+                if (rc != EOK)
+                        return rc;
+
+                rc = demo_bitmap_kc(gc, w, h);
                 if (rc != EOK)
                         return rc;