1 files changed, 131 insertions, 0 deletions
diff --git a/libdimension/dimension/canvas/canvas.h b/libdimension/dimension/canvas/canvas.h
new file mode 100644
index 0000000..07d4fde
--- /dev/null
+++ b/libdimension/dimension/canvas/canvas.h
@@ -0,0 +1,131 @@
+/*************************************************************************
+ * Copyright (C) 2009-2014 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
+ * A canvas which is rendered to.
+ */
+
+#ifndef DMNSN_CANVAS_H
+#error "Please include <dimension/canvas.h> instead of this header directly."
+#endif
+
+#include <stddef.h>
+
+/** A canvas, or image. */
+typedef struct dmnsn_canvas {
+  size_t width;  /**< Canvas width. */
+  size_t height; /**< Canvas height. */
+
+  /** An array of <tt>dmnsn_canvas_optimizer</tt>s. */
+  dmnsn_array *optimizers;
+
+  /**
+   * @internal
+   * Stored in first-quadrant representation (origin is bottom-left).  The pixel
+   * at (a,b) is accessible as pixels[b*width + a].
+   */
+  dmnsn_tcolor *pixels;
+} dmnsn_canvas;
+
+/* Forward-declare dmnsn_canvas_optimizer. */
+typedef struct dmnsn_canvas_optimizer dmnsn_canvas_optimizer;
+
+/**
+ * Canvas optimizer callback type.
+ * @param[in] optimizer  The canvas optimizer.
+ * @param[in] canvas  The canvas that was just updated.
+ * @param[in] x  The x-coordinate that was just updated.
+ * @param[in] y  The y-coordinate that was just updated.
+ */
+typedef void dmnsn_canvas_optimizer_fn(dmnsn_canvas_optimizer *optimizer, const dmnsn_canvas *canvas, size_t x, size_t y);
+
+/** Canvas optimizer. */
+struct dmnsn_canvas_optimizer {
+  dmnsn_canvas_optimizer_fn *optimizer_fn; /**< Optimizer callback. */
+};
+
+/**
+ * Allocate a new canvas.
+ * @param[in] pool  The memory pool to allocate from.
+ * @param[in] width  The width of the canvas to allocate (in pixels).
+ * @param[in] height  The height of the canvas to allocate (in pixels).
+ * @return The allocated canvas.
+ */
+dmnsn_canvas *dmnsn_new_canvas(dmnsn_pool *pool, size_t width, size_t height);
+
+/**
+ * Initialize a dmnsn_canvas_optimizer field
+ * @param[in] optimizer  The optimizer to initialize.
+ */
+void dmnsn_init_canvas_optimizer(dmnsn_canvas_optimizer *optimizer);
+
+/**
+ * Set a canvas optimizer
+ * @param[in,out] canvas    The canvas to optimize.
+ * @param[in]     optimizer The optimizer to use.
+ */
+void dmnsn_canvas_optimize(dmnsn_canvas *canvas,
+                           const dmnsn_canvas_optimizer *optimizer);
+
+/**
+ * Find a canvas optimizer by its callback.
+ * @param[in] canvas        The canvas to check.
+ * @param[in] optimizer_fn  The callback to search for for.
+ * @return A pointer to the canvas optimizer with the callback \p optimizer_fn,
+ *         or NULL if none is found.
+ */
+dmnsn_canvas_optimizer *
+dmnsn_canvas_find_optimizer(const dmnsn_canvas *canvas,
+                            dmnsn_canvas_optimizer_fn *optimizer_fn);
+
+/* Pixel accessors */
+
+/**
+ * Get the color of a pixel.
+ * @param[in] canvas  The canvas to access.
+ * @param[in] x       The x coordinate.
+ * @param[in] y       The y coordinate.
+ * @return The color of the pixel at (\p x, \p y).
+ */
+DMNSN_INLINE dmnsn_tcolor
+dmnsn_canvas_get_pixel(const dmnsn_canvas *canvas, size_t x, size_t y)
+{
+  dmnsn_assert(x < canvas->width && y < canvas->height,
+               "Canvas access out of bounds.");
+  return canvas->pixels[y*canvas->width + x];
+}
+
+/**
+ * Set the value of a pixel.
+ * @param[in,out] canvas  The canvas to modify.
+ * @param[in]     x       The x coordinate of the pixel.
+ * @param[in]     y       The y coordinate of the pixel.
+ * @param[in]     tcolor  The value to set the pixel at (\p x, \p y) to.
+ */
+void dmnsn_canvas_set_pixel(dmnsn_canvas *canvas, size_t x, size_t y,
+                            dmnsn_tcolor tcolor);
+
+/**
+ * Clear a canvas uniformly with a given color.
+ * @param[in,out] canvas  The canvas to erase.
+ * @param[in]     tcolor  The color to paint it with.
+ */
+void dmnsn_canvas_clear(dmnsn_canvas *canvas, dmnsn_tcolor tcolor);