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weston/clients/image.c

245 lines
6.0 KiB

/*
* Copyright © 2008 Kristian Høgsberg
* Copyright © 2009 Chris Wilson
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <cairo.h>
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <wayland-client.h>
#include "window.h"
struct image {
struct window *window;
struct widget *widget;
struct display *display;
gchar *filename;
};
static void
set_source_pixbuf(cairo_t *cr,
const GdkPixbuf *pixbuf,
double src_x,
double src_y,
double src_width,
double src_height)
{
gint width = gdk_pixbuf_get_width (pixbuf);
gint height = gdk_pixbuf_get_height (pixbuf);
guchar *gdk_pixels = gdk_pixbuf_get_pixels (pixbuf);
int gdk_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
int n_channels = gdk_pixbuf_get_n_channels (pixbuf);
int cairo_stride;
guchar *cairo_pixels;
cairo_format_t format;
cairo_surface_t *surface;
int j;
if (n_channels == 3)
format = CAIRO_FORMAT_RGB24;
else
format = CAIRO_FORMAT_ARGB32;
surface = cairo_image_surface_create(format, width, height);
if (cairo_surface_status(surface)) {
cairo_set_source_surface(cr, surface, 0, 0);
return;
}
cairo_stride = cairo_image_surface_get_stride(surface);
cairo_pixels = cairo_image_surface_get_data(surface);
for (j = height; j; j--) {
guchar *p = gdk_pixels;
guchar *q = cairo_pixels;
if (n_channels == 3) {
guchar *end = p + 3 * width;
while (p < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
q[0] = p[2];
q[1] = p[1];
q[2] = p[0];
#else
q[1] = p[0];
q[2] = p[1];
q[3] = p[2];
#endif
p += 3;
q += 4;
}
} else {
guchar *end = p + 4 * width;
guint t1,t2,t3;
#define MULT(d,c,a,t) G_STMT_START { t = c * a + 0x7f; d = ((t >> 8) + t) >> 8; } G_STMT_END
while (p < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
MULT(q[0], p[2], p[3], t1);
MULT(q[1], p[1], p[3], t2);
MULT(q[2], p[0], p[3], t3);
q[3] = p[3];
#else
q[0] = p[3];
MULT(q[1], p[0], p[3], t1);
MULT(q[2], p[1], p[3], t2);
MULT(q[3], p[2], p[3], t3);
#endif
p += 4;
q += 4;
}
#undef MULT
}
gdk_pixels += gdk_rowstride;
cairo_pixels += cairo_stride;
}
cairo_surface_mark_dirty(surface);
cairo_set_source_surface(cr, surface,
src_x + .5 * (src_width - width),
src_y + .5 * (src_height - height));
cairo_surface_destroy(surface);
}
static void
redraw_handler(struct widget *widget, void *data)
{
struct image *image = data;
struct rectangle allocation;
GdkPixbuf *pb;
cairo_t *cr;
cairo_surface_t *surface;
window_get_child_allocation(image->window, &allocation);
pb = gdk_pixbuf_new_from_file_at_size(image->filename,
allocation.width,
allocation.height,
NULL);
if (pb == NULL)
return;
surface = window_get_surface(image->window);
cr = cairo_create(surface);
window_get_child_allocation(image->window, &allocation);
cairo_rectangle(cr, allocation.x, allocation.y,
allocation.width, allocation.height);
cairo_clip(cr);
cairo_push_group(cr);
cairo_translate(cr, allocation.x, allocation.y);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 0, 0, 0, 1);
cairo_paint(cr);
set_source_pixbuf(cr, pb,
0, 0,
allocation.width, allocation.height);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_paint(cr);
g_object_unref(pb);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static void
keyboard_focus_handler(struct window *window,
struct input *device, void *data)
{
struct image *image = data;
window_schedule_redraw(image->window);
}
static struct image *
image_create(struct display *display, const char *filename)
{
struct image *image;
gchar *basename;
gchar *title;
image = malloc(sizeof *image);
if (image == NULL)
return image;
memset(image, 0, sizeof *image);
basename = g_path_get_basename(filename);
title = g_strdup_printf("Wayland Image - %s", basename);
g_free(basename);
image->filename = g_strdup(filename);
image->window = window_create(display, 500, 400);
image->widget = window_add_widget(image->window, image);
window_set_title(image->window, title);
image->display = display;
window_set_user_data(image->window, image);
widget_set_redraw_handler(image->widget, redraw_handler);
window_set_keyboard_focus_handler(image->window,
keyboard_focus_handler);
window_schedule_redraw(image->window);
return image;
}
static const GOptionEntry option_entries[] = {
{ NULL }
};
int
main(int argc, char *argv[])
{
struct display *d;
int i;
d = display_create(&argc, &argv, option_entries);
if (d == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return -1;
}
for (i = 1; i < argc; i++)
image_create (d, argv[i]);
display_run(d);
return 0;
}