From 8085395acc28d8c77901615f8862ceeda5773b09 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Sat, 4 Jul 2009 21:53:55 +0000
Subject: New interface for optimizing canvas conversions by registering
 dmnsn_set_pixel() callbacks.

---
 libdimension/dimension/canvas.h | 36 ++++++++++++++++++++++++------------
 libdimension/dimension/gl.h     |  3 ++-
 libdimension/dimension/png.h    |  3 +++
 3 files changed, 29 insertions(+), 13 deletions(-)

(limited to 'libdimension/dimension')

diff --git a/libdimension/dimension/canvas.h b/libdimension/dimension/canvas.h
index 4c94c33..a14333d 100644
--- a/libdimension/dimension/canvas.h
+++ b/libdimension/dimension/canvas.h
@@ -34,12 +34,34 @@ typedef struct {
    * at (a,b) is accessible as pixels[b*x + a].
    */
   dmnsn_color *pixels;
+
+  /* An array of dmnsn_canvas_optimizer's */
+  dmnsn_array *optimizers;
 } dmnsn_canvas;
 
+typedef struct dmnsn_canvas_optimizer dmnsn_canvas_optimizer;
+
+/* Canvas optimizer callback types */
+typedef void dmnsn_canvas_optimizer_fn(dmnsn_canvas *canvas,
+                                       dmnsn_canvas_optimizer optimizer,
+                                       unsigned int x, unsigned int y);
+typedef void dmnsn_canvas_optimizer_free_fn(void *ptr);
+
+/* Canvas optimizer */
+struct dmnsn_canvas_optimizer {
+  dmnsn_canvas_optimizer_fn *optimizer_fn;
+  dmnsn_canvas_optimizer_free_fn *free_fn;
+  void *ptr;
+};
+
 /* Allocate and free a canvas */
 dmnsn_canvas *dmnsn_new_canvas(unsigned int x, unsigned int y);
 void dmnsn_delete_canvas(dmnsn_canvas *canvas);
 
+/* Set a canvas optimizer */
+void dmnsn_optimize_canvas(dmnsn_canvas *canvas,
+                           dmnsn_canvas_optimizer optimizer);
+
 /* Pixel accessors */
 
 DMNSN_INLINE dmnsn_color
@@ -48,17 +70,7 @@ dmnsn_get_pixel(const dmnsn_canvas *canvas, unsigned int x, unsigned int y)
   return canvas->pixels[y*canvas->x + x];
 }
 
-DMNSN_INLINE void
-dmnsn_set_pixel(dmnsn_canvas *canvas,
-                unsigned int x, unsigned int y, dmnsn_color color)
-{
-  canvas->pixels[y*canvas->x + x] = color;
-}
-
-DMNSN_INLINE dmnsn_color *
-dmnsn_pixel_at(dmnsn_canvas *canvas, unsigned int x, unsigned int y)
-{
-  return canvas->pixels + y*canvas->x + x;
-}
+void dmnsn_set_pixel(dmnsn_canvas *canvas, unsigned int x, unsigned int y,
+                     dmnsn_color color);
 
 #endif /* DIMENSION_CANVAS_H */
diff --git a/libdimension/dimension/gl.h b/libdimension/dimension/gl.h
index f7de782..f81f662 100644
--- a/libdimension/dimension/gl.h
+++ b/libdimension/dimension/gl.h
@@ -26,7 +26,8 @@
 #ifndef DIMENSION_GL_H
 #define DIMENSION_GL_H
 
-#include <stdio.h>
+/* Optimize canvas for GL drawing */
+int dmnsn_gl_optimize_canvas(dmnsn_canvas *canvas);
 
 /* Write canvas to GL framebuffer.  Returns 0 on success, nonzero on failure. */
 int dmnsn_gl_write_canvas(const dmnsn_canvas *canvas);
diff --git a/libdimension/dimension/png.h b/libdimension/dimension/png.h
index 858f79f..f1b1470 100644
--- a/libdimension/dimension/png.h
+++ b/libdimension/dimension/png.h
@@ -27,6 +27,9 @@
 
 #include <stdio.h>
 
+/* Optimize canvas for PNG exporting */
+int dmnsn_png_optimize_canvas(dmnsn_canvas *canvas);
+
 /* Write canvas to file in PNG format.  Returns 0 on success, nonzero on
    failure */
 int dmnsn_png_write_canvas(const dmnsn_canvas *canvas, FILE *file);
-- 
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