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/*
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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 <i915_drm.h>
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#include <sys/ioctl.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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struct buffer *
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buffer_create(int fd, int width, int height, int stride)
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{
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struct buffer *buffer;
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struct drm_i915_gem_create create;
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struct drm_gem_flink flink;
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buffer = malloc(sizeof *buffer);
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buffer->width = width;
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buffer->height = height;
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buffer->stride = stride;
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memset(&create, 0, sizeof(create));
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create.size = height * stride;
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if (ioctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create) != 0) {
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fprintf(stderr, "gem create failed: %m\n");
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free(buffer);
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return NULL;
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}
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flink.handle = create.handle;
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if (ioctl(fd, DRM_IOCTL_GEM_FLINK, &flink) != 0) {
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fprintf(stderr, "gem flink failed: %m\n");
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free(buffer);
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return 0;
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}
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buffer->handle = flink.handle;
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buffer->name = flink.name;
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return buffer;
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}
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int
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buffer_destroy(struct buffer *buffer, int fd)
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{
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struct drm_gem_close close;
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close.handle = buffer->handle;
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if (ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close) < 0) {
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fprintf(stderr, "gem close failed: %m\n");
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return -1;
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}
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free(buffer);
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return 0;
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}
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int
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buffer_data(struct buffer *buffer, int fd, void *data)
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{
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struct drm_i915_gem_pwrite pwrite;
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pwrite.handle = buffer->handle;
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pwrite.offset = 0;
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pwrite.size = buffer->height * buffer->stride;
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pwrite.data_ptr = (uint64_t) (uintptr_t) data;
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if (ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite) < 0) {
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fprintf(stderr, "gem pwrite failed: %m\n");
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return -1;
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}
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return 0;
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}
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struct buffer *
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buffer_create_from_cairo_surface(int fd, cairo_surface_t *surface)
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{
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struct buffer *buffer;
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int32_t width, height, stride;
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void *data;
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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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data = cairo_image_surface_get_data(surface);
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buffer = buffer_create(fd, width, height, stride);
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if (buffer == NULL)
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return NULL;
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if (buffer_data(buffer, fd, data) < 0) {
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buffer_destroy(buffer, fd);
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return NULL;
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}
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return buffer;
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}
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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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cairo_surface_t *tmp;
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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[17];
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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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tmp = cairo_image_surface_create(CAIRO_FORMAT_RGB24, width, height);
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dst = cairo_image_surface_get_data(tmp);
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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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cairo_surface_destroy(tmp);
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}
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