* Add a "caca_create_dither_gd" function that create the proper dither for a

given gd resource.

caca-php/examples/dithering.php

@@ -1,12 +1,14 @@
 #!/usr/bin/php5
 <?
 $img = imagecreatefrompng(dirname(__FILE__)."/logo-caca.png");
-$canvas = caca_create_canvas(0, 0);
-
-$dither = caca_create_dither(32, 128, 128, 4 * 128, 0x00ff0000, 0x0000ff00, 0x000000ff, 0x00000000);
+$dither = caca_create_dither_gd($img);
+if (!$dither) 
+	die("Can not create dither. Maybe this image is not truecolor.\n");
 
+$canvas = caca_create_canvas(0, 0);
 $display = caca_create_display($canvas);
-caca_set_display_time($display, 80000);
+if (!$dither) 
+	die("Can not create display.\n");
 
 caca_dither_bitmap_gd($canvas, 0, 0, caca_get_canvas_width($canvas), caca_get_canvas_height($canvas), $dither, $img);
 caca_refresh_display($display);

caca-php/php_caca.c

@@ -88,6 +88,7 @@ static function_entry caca_functions[] = {
 	PHP_FE(caca_create_frame, NULL)
 	PHP_FE(caca_free_frame, NULL)
 	PHP_FE(caca_create_dither, NULL)
+	PHP_FE(caca_create_dither_gd, NULL)
 	PHP_FE(caca_set_dither_palette, NULL)
 	PHP_FE(caca_set_dither_brightness, NULL)
 	PHP_FE(caca_get_dither_brightness, NULL)
@@ -963,6 +964,20 @@ PHP_FUNCTION(caca_create_dither) {
 	ZEND_REGISTER_RESOURCE(return_value, dither, le_caca_dither);
 }
 
+PHP_FUNCTION(caca_create_dither_gd) {
+	zval *_zval;
+	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &_zval) == FAILURE) {
+		RETURN_FALSE;
+	}
+
+	gdImage *img = fetch_external_resource(_zval, "gd");
+	if (!img | !img->trueColor) {
+		RETURN_FALSE;
+	}
+	caca_dither_t *dither = caca_create_dither(sizeof(int) * 8, img->sx, img->sy, img->sx * sizeof(int), 0x00ff0000, 0x0000ff00, 0x000000ff, 0x00000000);
+	ZEND_REGISTER_RESOURCE(return_value, dither, le_caca_dither);
+}
+
 PHP_FUNCTION(caca_set_dither_palette) {
 }
 

caca-php/php_caca.h

@@ -105,6 +105,7 @@ PHP_FUNCTION(caca_set_frame_name);
 PHP_FUNCTION(caca_create_frame);
 PHP_FUNCTION(caca_free_frame);
 PHP_FUNCTION(caca_create_dither);
+PHP_FUNCTION(caca_create_dither_gd);
 PHP_FUNCTION(caca_set_dither_palette);
 PHP_FUNCTION(caca_set_dither_brightness);
 PHP_FUNCTION(caca_get_dither_brightness);