Пример #1
0
/**
 * Function: gdImageCropThreshold
 *
 * Crop an image using a given color
 *
 * The _threshold_ defines the tolerance to be used while comparing the image
 * color and the color to crop. The method used to calculate the color
 * difference is based on the color distance in the RGB(A) cube.
 *
 * Parameters:
 *   im        - The image.
 *   color     - The crop color.
 *   threshold - The crop threshold.
 *
 * Returns:
 *   The newly created cropped image, or NULL on failure.
 *
 * See also:
 *   - <gdImageCrop>
 *   - <gdImageCropAuto>
 */
BGD_DECLARE(gdImagePtr) gdImageCropThreshold(gdImagePtr im, const unsigned int color, const float threshold)
{
	const int width = gdImageSX(im);
	const int height = gdImageSY(im);

	int x,y;
	int match;
	gdRect crop;

	crop.x = 0;
	crop.y = 0;
	crop.width = 0;
	crop.height = 0;

	/* Pierre: crop everything sounds bad */
	if (threshold > 100.0) {
		return NULL;
	}

	if (!gdImageTrueColor(im) && color >= gdImageColorsTotal(im)) {
		return NULL;
	}

	/* TODO: Add gdImageGetRowPtr and works with ptr at the row level
	 * for the true color and palette images
	 * new formats will simply work with ptr
	 */
	match = 1;
	for (y = 0; match && y < height; y++) {
		for (x = 0; match && x < width; x++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x,y), threshold)) > 0;
		}
	}

	/* Whole image would be cropped > bye */
	if (match) {
		return NULL;
	}

	crop.y = y - 1;

	match = 1;
	for (y = height - 1; match && y >= 0; y--) {
		for (x = 0; match && x < width; x++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x, y), threshold)) > 0;
		}
	}
	crop.height = y - crop.y + 2;

	match = 1;
	for (x = 0; match && x < width; x++) {
		for (y = 0; match && y < crop.y + crop.height; y++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x,y), threshold)) > 0;
		}
	}
	crop.x = x - 1;

	match = 1;
	for (x = width - 1; match && x >= 0; x--) {
		for (y = 0; match &&  y < crop.y + crop.height; y++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x,y), threshold)) > 0;
		}
	}
	crop.width = x - crop.x + 2;

	return gdImageCrop(im, &crop);
}
Пример #2
0
/**
 * Function: gdImageThresholdCrop
 *  Crop an image using a given color. The threshold argument defines
 *  the tolerance to be used while comparing the image color and the
 *  color to crop. The method used to calculate the color difference
 *  is based on the color distance in the RGB(a) cube.
 *
 *
 * Parameters:
 * 	im - Source image
 *  color - color to crop
 *  threshold - tolerance (0..100)
 *
 * Returns:
 *  <gdImagePtr> on success or NULL
 *
 * See also:
 *  <gdCropMode>, <gdImageAutoCrop> or <gdImageCrop>
 */
gdImagePtr gdImageCropThreshold(gdImagePtr im, const unsigned int color, const float threshold)
{
	const int width = gdImageSX(im);
	const int height = gdImageSY(im);

	int x,y;
	int match;
	gdRect crop;

	crop.x = 0;
	crop.y = 0;
	crop.width = 0;
	crop.height = 0;

	/* Pierre: crop everything sounds bad */
	if (threshold > 1.0) {
		return NULL;
	}

	/* TODO: Add gdImageGetRowPtr and works with ptr at the row level
	 * for the true color and palette images
	 * new formats will simply work with ptr
	 */
	match = 1;
	for (y = 0; match && y < height; y++) {
		for (x = 0; match && x < width; x++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x,y), threshold)) > 0;
		}
	}

	/* Pierre
	 * Nothing to do > bye
	 * Duplicate the image?
	 */
	if (y == height - 1) {
		return NULL;
	}

	crop.y = y -1;
	match = 1;
	for (y = height - 1; match && y >= 0; y--) {
		for (x = 0; match && x < width; x++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x, y), threshold)) > 0;
		}
	}

	if (y == 0) {
		crop.height = height - crop.y + 1;
	} else {
		crop.height = y - crop.y + 2;
	}

	match = 1;
	for (x = 0; match && x < width; x++) {
		for (y = 0; match && y < crop.y + crop.height - 1; y++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x,y), threshold)) > 0;
		}
	}
	crop.x = x - 1;

	match = 1;
	for (x = width - 1; match && x >= 0; x--) {
		for (y = 0; match &&  y < crop.y + crop.height - 1; y++) {
			match = (gdColorMatch(im, color, gdImageGetPixel(im, x,y), threshold)) > 0;
		}
	}
	crop.width = x - crop.x + 2;

	return gdImageCrop(im, &crop);
}