118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is libguac.
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*
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* The Initial Developer of the Original Code is
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* Michael Jumper.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <inttypes.h>
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#include <cairo/cairo.h>
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#include <sys/types.h>
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#include "palette.h"
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guac_palette* __guac_create_palette(cairo_surface_t* surface) {
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int x, y;
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int width = cairo_image_surface_get_width(surface);
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int height = cairo_image_surface_get_height(surface);
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int stride = cairo_image_surface_get_stride(surface);
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unsigned char* data = cairo_image_surface_get_data(surface);
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/* Allocate palette */
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guac_palette* palette = (guac_palette*) malloc(sizeof(guac_palette));
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memset(palette, 0, sizeof(guac_palette));
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for (y=0; y<height; y++) {
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for (x=0; x<width; x++) {
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/* Get pixel color */
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int color = ((uint32_t*) data)[x] & 0xFFFFFF;
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/* Calculate hash code */
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int hash = ((color & 0xFFF000) >> 12) ^ (color & 0xFFF);
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guac_palette_entry* entry;
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/* Search for open palette entry */
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for (;;) {
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entry = &(palette->entries[hash]);
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/* If we've found a free space, use it */
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if (entry->index == 0) {
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/* Stop if already at capacity */
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if (palette->colors == 256) {
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__guac_free_palette(palette);
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return NULL;
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}
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/* Add color to map, done */
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entry->index = ++palette->colors;
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entry->color = color;
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break;
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}
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/* Otherwise, if already stored here, done */
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if (entry->color == color)
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break;
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/* Otherwise, collision. Move on to another bucket */
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hash = (hash+1) & 0xFFF;
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}
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}
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/* Advance to next data row */
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data += stride;
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}
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return palette;
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}
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void __guac_free_palette(guac_palette* palette) {
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free(palette);
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}
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