weston/clients/image.c
Leandro Ribeiro c427ae5a49 clients/image: use widget variable directly
Cosmetic change. Instead of accessing image->frame_widget on the widget
handlers, use the parameter widget.

Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
2024-04-26 14:15:28 +00:00

442 lines
11 KiB
C

/*
* Copyright © 2008 Kristian Høgsberg
* Copyright © 2009 Chris Wilson
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <libgen.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <cairo.h>
#include <assert.h>
#include <errno.h>
#include <linux/input.h>
#include <wayland-client.h>
#include "window.h"
#include "shared/cairo-util.h"
struct image {
struct window *window;
/* Decorations, buttons, etc. */
struct widget *frame_widget;
struct display *display;
char *filename;
cairo_surface_t *image;
int fullscreen;
int *image_counter;
int32_t width, height;
struct {
double x;
double y;
} pointer;
bool button_pressed;
bool initialized;
cairo_matrix_t matrix;
};
static double
get_scale(struct image *image)
{
assert(image->matrix.xy == 0.0 &&
image->matrix.yx == 0.0 &&
image->matrix.xx == image->matrix.yy);
return image->matrix.xx;
}
static void
clamp_view(struct image *image)
{
struct rectangle allocation;
double scale = get_scale(image);
double sw, sh;
sw = image->width * scale;
sh = image->height * scale;
widget_get_allocation(image->frame_widget, &allocation);
if (sw < allocation.width) {
image->matrix.x0 =
(allocation.width - image->width * scale) / 2;
} else {
if (image->matrix.x0 > 0.0)
image->matrix.x0 = 0.0;
if (sw + image->matrix.x0 < allocation.width)
image->matrix.x0 = allocation.width - sw;
}
if (sh < allocation.height) {
image->matrix.y0 =
(allocation.height - image->height * scale) / 2;
} else {
if (image->matrix.y0 > 0.0)
image->matrix.y0 = 0.0;
if (sh + image->matrix.y0 < allocation.height)
image->matrix.y0 = allocation.height - sh;
}
}
static void
redraw_handler(struct widget *widget, void *data)
{
struct image *image = data;
struct rectangle allocation;
cairo_t *cr;
cairo_surface_t *surface;
double width, height, doc_aspect, window_aspect, scale;
cairo_matrix_t matrix;
cairo_matrix_t translate;
surface = window_get_surface(image->window);
cr = cairo_create(surface);
widget_get_allocation(widget, &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);
if (!image->initialized) {
image->initialized = true;
width = cairo_image_surface_get_width(image->image);
height = cairo_image_surface_get_height(image->image);
doc_aspect = width / height;
window_aspect = (double) allocation.width / allocation.height;
if (doc_aspect < window_aspect)
scale = allocation.height / height;
else
scale = allocation.width / width;
image->width = width;
image->height = height;
cairo_matrix_init_scale(&image->matrix, scale, scale);
clamp_view(image);
}
matrix = image->matrix;
cairo_matrix_init_translate(&translate, allocation.x, allocation.y);
cairo_matrix_multiply(&matrix, &matrix, &translate);
cairo_set_matrix(cr, &matrix);
cairo_set_source_surface(cr, image->image, 0, 0);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_paint(cr);
cairo_pop_group_to_source(cr);
cairo_paint(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);
}
static void
resize_handler(struct widget *widget,
int32_t width, int32_t height, void *data)
{
struct image *image = data;
clamp_view(image);
}
static void
keyboard_focus_handler(struct window *window,
struct input *device, void *data)
{
struct image *image = data;
window_schedule_redraw(image->window);
}
static int
enter_handler(struct widget *widget,
struct input *input,
float x, float y, void *data)
{
struct image *image = data;
struct rectangle allocation;
widget_get_allocation(widget, &allocation);
x -= allocation.x;
y -= allocation.y;
image->pointer.x = x;
image->pointer.y = y;
return 1;
}
static void
move_viewport(struct image *image, double dx, double dy)
{
double scale = get_scale(image);
if (!image->initialized)
return;
cairo_matrix_translate(&image->matrix, -dx/scale, -dy/scale);
clamp_view(image);
window_schedule_redraw(image->window);
}
static int
motion_handler(struct widget *widget,
struct input *input, uint32_t time,
float x, float y, void *data)
{
struct image *image = data;
struct rectangle allocation;
widget_get_allocation(widget, &allocation);
x -= allocation.x;
y -= allocation.y;
if (image->button_pressed)
move_viewport(image, image->pointer.x - x,
image->pointer.y - y);
image->pointer.x = x;
image->pointer.y = y;
return image->button_pressed ? CURSOR_DRAGGING : CURSOR_LEFT_PTR;
}
static void
button_handler(struct widget *widget,
struct input *input, uint32_t time,
uint32_t button,
enum wl_pointer_button_state state,
void *data)
{
struct image *image = data;
if (button == BTN_LEFT) {
image->button_pressed =
state == WL_POINTER_BUTTON_STATE_PRESSED;
if (state == WL_POINTER_BUTTON_STATE_PRESSED)
input_set_pointer_image(input, CURSOR_DRAGGING);
else
input_set_pointer_image(input, CURSOR_LEFT_PTR);
}
}
static void
zoom(struct image *image, double scale)
{
double x = image->pointer.x;
double y = image->pointer.y;
cairo_matrix_t scale_matrix;
if (!image->initialized)
return;
if (get_scale(image) * scale > 20.0 ||
get_scale(image) * scale < 0.02)
return;
cairo_matrix_init_identity(&scale_matrix);
cairo_matrix_translate(&scale_matrix, x, y);
cairo_matrix_scale(&scale_matrix, scale, scale);
cairo_matrix_translate(&scale_matrix, -x, -y);
cairo_matrix_multiply(&image->matrix, &image->matrix, &scale_matrix);
clamp_view(image);
}
static void
key_handler(struct window *window, struct input *input, uint32_t time,
uint32_t key, uint32_t sym, enum wl_keyboard_key_state state,
void *data)
{
struct image *image = data;
if (state == WL_KEYBOARD_KEY_STATE_RELEASED)
return;
switch (sym) {
case XKB_KEY_minus:
zoom(image, 0.8);
window_schedule_redraw(image->window);
break;
case XKB_KEY_equal:
case XKB_KEY_plus:
zoom(image, 1.2);
window_schedule_redraw(image->window);
break;
case XKB_KEY_1:
image->matrix.xx = 1.0;
image->matrix.xy = 0.0;
image->matrix.yx = 0.0;
image->matrix.yy = 1.0;
clamp_view(image);
window_schedule_redraw(image->window);
break;
}
}
static void
axis_handler(struct widget *widget, struct input *input, uint32_t time,
uint32_t axis, wl_fixed_t value, void *data)
{
struct image *image = data;
if (axis == WL_POINTER_AXIS_VERTICAL_SCROLL &&
input_get_modifiers(input) == MOD_CONTROL_MASK) {
/* set zoom level to 2% per 10 axis units */
zoom(image, (1.0 - wl_fixed_to_double(value) / 500.0));
window_schedule_redraw(image->window);
} else if (input_get_modifiers(input) == 0) {
if (axis == WL_POINTER_AXIS_VERTICAL_SCROLL)
move_viewport(image, 0, wl_fixed_to_double(value));
else if (axis == WL_POINTER_AXIS_HORIZONTAL_SCROLL)
move_viewport(image, wl_fixed_to_double(value), 0);
}
}
static void
fullscreen_handler(struct window *window, void *data)
{
struct image *image = data;
image->fullscreen ^= 1;
window_set_fullscreen(window, image->fullscreen);
}
static void
close_handler(void *data)
{
struct image *image = data;
*image->image_counter -= 1;
if (*image->image_counter == 0)
display_exit(image->display);
widget_destroy(image->frame_widget);
window_destroy(image->window);
free(image);
}
static struct image *
image_create(struct display *display, const char *filename,
int *image_counter)
{
struct image *image;
char *b, *copy, title[512];
image = zalloc(sizeof *image);
if (image == NULL)
return image;
copy = strdup(filename);
b = basename(copy);
snprintf(title, sizeof title, "Wayland Image - %s", b);
free(copy);
image->filename = strdup(filename);
image->image = load_cairo_surface(filename);
if (!image->image) {
free(image->filename);
free(image);
return NULL;
}
image->window = window_create(display);
image->frame_widget = window_frame_create(image->window, image);
window_set_title(image->window, title);
window_set_appid(image->window, "org.freedesktop.weston.wayland-image");
image->display = display;
image->image_counter = image_counter;
*image_counter += 1;
image->initialized = false;
window_set_user_data(image->window, image);
widget_set_redraw_handler(image->frame_widget, redraw_handler);
widget_set_resize_handler(image->frame_widget, resize_handler);
window_set_keyboard_focus_handler(image->window,
keyboard_focus_handler);
window_set_fullscreen_handler(image->window, fullscreen_handler);
window_set_close_handler(image->window, close_handler);
widget_set_enter_handler(image->frame_widget, enter_handler);
widget_set_motion_handler(image->frame_widget, motion_handler);
widget_set_button_handler(image->frame_widget, button_handler);
widget_set_axis_handler(image->frame_widget, axis_handler);
window_set_key_handler(image->window, key_handler);
widget_schedule_resize(image->frame_widget, 500, 400);
return image;
}
int
main(int argc, char *argv[])
{
struct display *d;
int i;
int image_counter = 0;
if (argc <= 1 || argv[1][0]=='-') {
printf("Usage: %s image...\n", argv[0]);
return 1;
}
d = display_create(&argc, argv);
if (d == NULL) {
fprintf(stderr, "failed to create display: %s\n",
strerror(errno));
return -1;
}
for (i = 1; i < argc; i++)
image_create(d, argv[i], &image_counter);
if (image_counter > 0)
display_run(d);
display_destroy(d);
return 0;
}