weston/clients/cairo-util.c
2011-10-20 14:44:48 -04:00

343 lines
9.1 KiB
C

/*
* Copyright © 2008 Kristian Høgsberg
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <cairo.h>
#include "cairo-util.h"
#include <jpeglib.h>
#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
void
surface_flush_device(cairo_surface_t *surface)
{
cairo_device_t *device;
device = cairo_surface_get_device(surface);
if (device)
cairo_device_flush(device);
}
void
blur_surface(cairo_surface_t *surface, int margin)
{
int32_t width, height, stride, x, y, z, w;
uint8_t *src, *dst;
uint32_t *s, *d, a, p;
int i, j, k, size, half;
uint32_t kernel[49];
double f;
size = ARRAY_LENGTH(kernel);
width = cairo_image_surface_get_width(surface);
height = cairo_image_surface_get_height(surface);
stride = cairo_image_surface_get_stride(surface);
src = cairo_image_surface_get_data(surface);
dst = malloc(height * stride);
half = size / 2;
a = 0;
for (i = 0; i < size; i++) {
f = (i - half);
kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
a += kernel[i];
}
for (i = 0; i < height; i++) {
s = (uint32_t *) (src + i * stride);
d = (uint32_t *) (dst + i * stride);
for (j = 0; j < width; j++) {
if (margin < j && j < width - margin) {
d[j] = s[j];
continue;
}
x = 0;
y = 0;
z = 0;
w = 0;
for (k = 0; k < size; k++) {
if (j - half + k < 0 || j - half + k >= width)
continue;
p = s[j - half + k];
x += (p >> 24) * kernel[k];
y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k];
}
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
}
}
for (i = 0; i < height; i++) {
s = (uint32_t *) (dst + i * stride);
d = (uint32_t *) (src + i * stride);
for (j = 0; j < width; j++) {
if (margin <= i && i < height - margin) {
d[j] = s[j];
continue;
}
x = 0;
y = 0;
z = 0;
w = 0;
for (k = 0; k < size; k++) {
if (i - half + k < 0 || i - half + k >= height)
continue;
s = (uint32_t *) (dst + (i - half + k) * stride);
p = s[j];
x += (p >> 24) * kernel[k];
y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k];
}
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
}
}
free(dst);
cairo_surface_mark_dirty(surface);
}
void
tile_mask(cairo_t *cr, cairo_surface_t *surface,
int x, int y, int width, int height, int margin, int top_margin)
{
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
int i, fx, fy, vmargin;
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
pattern = cairo_pattern_create_for_surface (surface);
for (i = 0; i < 4; i++) {
fx = i & 1;
fy = i >> 1;
cairo_matrix_init_translate(&matrix,
-x + fx * (128 - width),
-y + fy * (128 - height));
cairo_pattern_set_matrix(pattern, &matrix);
if (fy)
vmargin = margin;
else
vmargin = top_margin;
cairo_reset_clip(cr);
cairo_rectangle(cr,
x + fx * (width - margin),
y + fy * (height - vmargin),
margin, vmargin);
cairo_clip (cr);
cairo_mask(cr, pattern);
}
/* Top strecth */
cairo_matrix_init_translate(&matrix, 64, 0);
cairo_matrix_scale(&matrix, 64.0 / (width - 2 * margin), 1);
cairo_matrix_translate(&matrix, -x - width / 2, -y);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + margin, y, width - 2 * margin, margin);
cairo_reset_clip(cr);
cairo_rectangle(cr,
x + margin,
y,
width - 2 * margin, margin);
cairo_clip (cr);
cairo_mask(cr, pattern);
/* Bottom strecth */
cairo_matrix_translate(&matrix, 0, -height + 128);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_reset_clip(cr);
cairo_rectangle(cr, x + margin, y + height - margin,
width - 2 * margin, margin);
cairo_clip (cr);
cairo_mask(cr, pattern);
/* Left strecth */
cairo_matrix_init_translate(&matrix, 0, 64);
cairo_matrix_scale(&matrix, 1, 64.0 / (height - 2 * margin));
cairo_matrix_translate(&matrix, -x, -y - height / 2);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_reset_clip(cr);
cairo_rectangle(cr, x, y + margin, margin, height - 2 * margin);
cairo_clip (cr);
cairo_mask(cr, pattern);
/* Right strecth */
cairo_matrix_translate(&matrix, -width + 128, 0);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + width - margin, y + margin,
margin, height - 2 * margin);
cairo_reset_clip(cr);
cairo_clip (cr);
cairo_mask(cr, pattern);
cairo_pattern_destroy(pattern);
cairo_reset_clip(cr);
}
void
tile_source(cairo_t *cr, cairo_surface_t *surface,
int x, int y, int width, int height, int margin, int top_margin)
{
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
int i, fx, fy, vmargin;
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
pattern = cairo_pattern_create_for_surface (surface);
cairo_set_source(cr, pattern);
cairo_pattern_destroy(pattern);
for (i = 0; i < 4; i++) {
fx = i & 1;
fy = i >> 1;
cairo_matrix_init_translate(&matrix,
-x + fx * (128 - width),
-y + fy * (128 - height));
cairo_pattern_set_matrix(pattern, &matrix);
if (fy)
vmargin = margin;
else
vmargin = top_margin;
cairo_rectangle(cr,
x + fx * (width - margin),
y + fy * (height - vmargin),
margin, vmargin);
cairo_fill(cr);
}
/* Top strecth */
cairo_matrix_init_translate(&matrix, 64, 0);
cairo_matrix_scale(&matrix, 64.0 / (width - 2 * margin), 1);
cairo_matrix_translate(&matrix, -x - width / 2, -y);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + margin, y, width - 2 * margin, top_margin);
cairo_fill(cr);
/* Bottom strecth */
cairo_matrix_translate(&matrix, 0, -height + 128);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + margin, y + height - margin,
width - 2 * margin, margin);
cairo_fill(cr);
/* Left strecth */
cairo_matrix_init_translate(&matrix, 0, 64);
cairo_matrix_scale(&matrix, 1, 64.0 / (height - margin - top_margin));
cairo_matrix_translate(&matrix, -x, -y - height / 2);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x, y + top_margin,
margin, height - margin - top_margin);
cairo_fill(cr);
/* Right strecth */
cairo_matrix_translate(&matrix, -width + 128, 0);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + width - margin, y + top_margin,
margin, height - margin - top_margin);
cairo_fill(cr);
}
void
rounded_rect(cairo_t *cr, int x0, int y0, int x1, int y1, int radius)
{
cairo_move_to(cr, x0, y0 + radius);
cairo_arc(cr, x0 + radius, y0 + radius, radius, M_PI, 3 * M_PI / 2);
cairo_line_to(cr, x1 - radius, y0);
cairo_arc(cr, x1 - radius, y0 + radius, radius, 3 * M_PI / 2, 2 * M_PI);
cairo_line_to(cr, x1, y1 - radius);
cairo_arc(cr, x1 - radius, y1 - radius, radius, 0, M_PI / 2);
cairo_line_to(cr, x0 + radius, y1);
cairo_arc(cr, x0 + radius, y1 - radius, radius, M_PI / 2, M_PI);
cairo_close_path(cr);
}
cairo_surface_t *
load_jpeg(const char *filename)
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE *fp;
int stride, i;
JSAMPLE *data, *rows[4];
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
fp = fopen(filename, "rb");
if (fp == NULL) {
fprintf(stderr, "can't open %s\n", filename);
return NULL;
}
jpeg_stdio_src(&cinfo, fp);
jpeg_read_header(&cinfo, TRUE);
cinfo.out_color_space = JCS_EXT_BGRX;
jpeg_start_decompress(&cinfo);
stride = cairo_format_stride_for_width(CAIRO_FORMAT_RGB24,
cinfo.output_width);
data = malloc(stride * cinfo.output_height);
if (data == NULL) {
fprintf(stderr, "couldn't allocate image data\n");
return NULL;
}
while (cinfo.output_scanline < cinfo.output_height) {
for (i = 0; i < ARRAY_LENGTH(rows); i++)
rows[i] = data + (cinfo.output_scanline + i) * stride;
jpeg_read_scanlines(&cinfo, rows, ARRAY_LENGTH(rows));
}
jpeg_finish_decompress(&cinfo);
fclose(fp);
jpeg_destroy_decompress(&cinfo);
return cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_RGB24,
cinfo.output_width,
cinfo.output_height,
stride);
}