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/*************************************************************************
* Copyright (C) 2009-2011 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
* A canvas which is rendered to.
*/
#include <stddef.h>
/** A canvas, or image. */
typedef struct {
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_color *pixels;
dmnsn_refcount refcount; /**< @internal Reference count. */
} dmnsn_canvas;
/* Forward-declare dmnsn_canvas_optimizer */
typedef struct dmnsn_canvas_optimizer dmnsn_canvas_optimizer;
/**
* Canvas optimizer callback type.
* @param[in] canvas The canvas that was just updated.
* @param[in] optimizer The canvas optimizer itself.
* @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(const dmnsn_canvas *canvas,
dmnsn_canvas_optimizer optimizer,
size_t x, size_t y);
/** Canvas optimizer. */
struct dmnsn_canvas_optimizer {
dmnsn_canvas_optimizer_fn *optimizer_fn; /**< Optimizer callback. */
dmnsn_free_fn *free_fn; /**< Destructor callback. */
void *ptr; /**< Generic pointer. */
};
/**
* Allocate a new canvas.
* @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(size_t width, size_t height);
/**
* Delete a canvas.
* @param[in,out] canvas The canvas to delete.
*/
void dmnsn_delete_canvas(dmnsn_canvas *canvas);
/**
* Set a canvas optimizer
* @param[in,out] canvas The canvas to optimize.
* @param[in] optimizer The optimizer to use.
*/
void dmnsn_optimize_canvas(dmnsn_canvas *canvas,
dmnsn_canvas_optimizer optimizer);
/* 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 canvas at (\p x, \p y).
*/
DMNSN_INLINE dmnsn_color
dmnsn_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 color 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] color The color to set the pixel at (\p x, \p y) to.
*/
void dmnsn_set_pixel(dmnsn_canvas *canvas, size_t x, size_t y,
dmnsn_color color);
/**
* Clear a canvas uniformly with a given color.
* @param[in,out] canvas The canvas to erase.
* @param[in] color The color to paint it with.
*/
void dmnsn_clear_canvas(dmnsn_canvas *canvas, dmnsn_color color);
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