gl: Make drawing faster by using a better pixel format.

1 files changed, 89 insertions, 0 deletions

diff --git a/libdimension/rgba.c b/libdimension/rgba.c
new file mode 100644
index 0000000..6df124e
--- /dev/null
+++ b/libdimension/rgba.c
@@ -0,0 +1,89 @@
+/*************************************************************************
+ * Copyright (C) 2010-2011 Tavian Barnes <tavianator@tavianator.com>     *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * 16-bit RGBA canvas optimizer.
+ */
+
+#include "dimension-internal.h"
+#include <stdint.h>
+
+void
+dmnsn_rgba8_optimize_canvas(dmnsn_canvas *canvas)
+{
+  if (dmnsn_canvas_find_optimizer(canvas, dmnsn_rgba8_optimizer_fn)) {
+    return;
+  }
+
+  dmnsn_canvas_optimizer optimizer;
+  optimizer.optimizer_fn = dmnsn_rgba8_optimizer_fn;
+  optimizer.free_fn = dmnsn_free;
+  optimizer.ptr = dmnsn_malloc(4*canvas->width*canvas->height*sizeof(uint8_t));
+
+  dmnsn_canvas_optimize(canvas, &optimizer);
+}
+
+void
+dmnsn_rgba16_optimize_canvas(dmnsn_canvas *canvas)
+{
+  if (dmnsn_canvas_find_optimizer(canvas, dmnsn_rgba16_optimizer_fn)) {
+    return;
+  }
+
+  dmnsn_canvas_optimizer optimizer;
+  optimizer.optimizer_fn = dmnsn_rgba16_optimizer_fn;
+  optimizer.free_fn = dmnsn_free;
+  optimizer.ptr = dmnsn_malloc(4*canvas->width*canvas->height*sizeof(uint16_t));
+
+  dmnsn_canvas_optimize(canvas, &optimizer);
+}
+
+void
+dmnsn_rgba8_optimizer_fn(const dmnsn_canvas *canvas, void *ptr,
+                         size_t x, size_t y)
+{
+  uint8_t *pixel = (uint8_t *)ptr + 4*(y*canvas->width + x);
+  dmnsn_tcolor tcolor = dmnsn_canvas_get_pixel(canvas, x, y);
+  tcolor = dmnsn_tcolor_remove_filter(tcolor);
+  tcolor.c = dmnsn_color_to_sRGB(tcolor.c);
+  tcolor = dmnsn_tcolor_saturate(tcolor);
+
+  pixel[0] = lround(tcolor.c.R*UINT8_MAX);
+  pixel[1] = lround(tcolor.c.G*UINT8_MAX);
+  pixel[2] = lround(tcolor.c.B*UINT8_MAX);
+  pixel[3] = lround(tcolor.T*UINT8_MAX);
+}
+
+void
+dmnsn_rgba16_optimizer_fn(const dmnsn_canvas *canvas, void *ptr,
+                          size_t x, size_t y)
+{
+  uint16_t *pixel = (uint16_t *)ptr + 4*(y*canvas->width + x);
+  dmnsn_tcolor tcolor = dmnsn_canvas_get_pixel(canvas, x, y);
+  tcolor = dmnsn_tcolor_remove_filter(tcolor);
+  tcolor.c = dmnsn_color_to_sRGB(tcolor.c);
+  tcolor = dmnsn_tcolor_saturate(tcolor);
+
+  pixel[0] = lround(tcolor.c.R*UINT16_MAX);
+  pixel[1] = lround(tcolor.c.G*UINT16_MAX);
+  pixel[2] = lround(tcolor.c.B*UINT16_MAX);
+  pixel[3] = lround(tcolor.T*UINT16_MAX);
+}