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115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*
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* Copyright © 2008 Kristian Høgsberg
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <math.h>
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#include <cairo.h>
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#include "cairo-util.h"
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#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
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void
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blur_surface(cairo_surface_t *surface, int margin)
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{
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int32_t width, height, stride, x, y, z, w;
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uint8_t *src, *dst;
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uint32_t *s, *d, a, p;
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int i, j, k, size, half;
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uint8_t kernel[35];
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double f;
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size = ARRAY_LENGTH(kernel);
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width = cairo_image_surface_get_width(surface);
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height = cairo_image_surface_get_height(surface);
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stride = cairo_image_surface_get_stride(surface);
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src = cairo_image_surface_get_data(surface);
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dst = malloc(height * stride);
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half = size / 2;
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a = 0;
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for (i = 0; i < size; i++) {
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f = (i - half);
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kernel[i] = exp(- f * f / 30.0) * 80;
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a += kernel[i];
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}
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for (i = 0; i < height; i++) {
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s = (uint32_t *) (src + i * stride);
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d = (uint32_t *) (dst + i * stride);
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for (j = 0; j < width; j++) {
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if (margin < j && j < width - margin) {
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d[j] = s[j];
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continue;
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}
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x = 0;
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y = 0;
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z = 0;
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w = 0;
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for (k = 0; k < size; k++) {
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if (j - half + k < 0 || j - half + k >= width)
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continue;
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p = s[j - half + k];
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x += (p >> 24) * kernel[k];
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y += ((p >> 16) & 0xff) * kernel[k];
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z += ((p >> 8) & 0xff) * kernel[k];
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w += (p & 0xff) * kernel[k];
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}
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d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
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}
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}
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for (i = 0; i < height; i++) {
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s = (uint32_t *) (dst + i * stride);
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d = (uint32_t *) (src + i * stride);
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for (j = 0; j < width; j++) {
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if (margin <= i && i < height - margin) {
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d[j] = s[j];
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continue;
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}
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x = 0;
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y = 0;
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z = 0;
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w = 0;
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for (k = 0; k < size; k++) {
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if (i - half + k < 0 || i - half + k >= height)
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continue;
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s = (uint32_t *) (dst + (i - half + k) * stride);
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p = s[j];
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x += (p >> 24) * kernel[k];
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y += ((p >> 16) & 0xff) * kernel[k];
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z += ((p >> 8) & 0xff) * kernel[k];
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w += (p & 0xff) * kernel[k];
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}
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d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
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}
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}
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free(dst);
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}
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