summaryrefslogtreecommitdiff
path: root/libs/pixman-0.40.0/demos/dither.c
blob: d72c250ed69d9548a83d41fdfc3201f2c4778476 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
/*
 * Copyright 2012, Red Hat, Inc.
 * Copyright 2012, Soren Sandmann
 * Copyright 2018, Basile Clement
 *
 * 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <gtk/gtk.h>
#include <stdlib.h>
#include "../test/utils.h"
#include "gtk-utils.h"

#define WIDTH 1024
#define HEIGHT 640

typedef struct
{
    GtkBuilder *         builder;
    pixman_image_t *	 original;
    pixman_format_code_t format;
    pixman_dither_t      dither;
    int                  width;
    int                  height;
} app_t;

static GtkWidget *
get_widget (app_t *app, const char *name)
{
    GtkWidget *widget = GTK_WIDGET (gtk_builder_get_object (app->builder, name));

    if (!widget)
	g_error ("Widget %s not found\n", name);

    return widget;
}

typedef struct
{
    char	name [20];
    int		value;
} named_int_t;

static const named_int_t formats[] =
{
    { "a8r8g8b8",  PIXMAN_a8r8g8b8      },
    { "rgb",       PIXMAN_rgb_float     },
    { "sRGB",      PIXMAN_a8r8g8b8_sRGB },
    { "r5g6b5",    PIXMAN_r5g6b5        },
    { "a4r4g4b4",  PIXMAN_a4r4g4b4      },
    { "a2r2g2b2",  PIXMAN_a2r2g2b2      },
    { "r3g3b2",    PIXMAN_r3g3b2        },
    { "r1g2b1",    PIXMAN_r1g2b1        },
    { "a1r1g1b1",  PIXMAN_a1r1g1b1      },
};

static const named_int_t dithers[] =
{
    { "None",                   PIXMAN_REPEAT_NONE },
    { "Bayer 8x8",              PIXMAN_DITHER_ORDERED_BAYER_8 },
    { "Blue noise 64x64",       PIXMAN_DITHER_ORDERED_BLUE_NOISE_64 },
};

static int
get_value (app_t *app, const named_int_t table[], const char *box_name)
{
    GtkComboBox *box = GTK_COMBO_BOX (get_widget (app, box_name));

    return table[gtk_combo_box_get_active (box)].value;
}

static void
rescale (GtkWidget *may_be_null, app_t *app)
{
    app->dither = get_value (app, dithers, "dithering_combo_box");
    app->format = get_value (app, formats, "target_format_combo_box");

    gtk_widget_set_size_request (
	get_widget (app, "drawing_area"), app->width + 0.5, app->height + 0.5);

    gtk_widget_queue_draw (
	get_widget (app, "drawing_area"));
}

static gboolean
on_expose (GtkWidget *da, GdkEvent *event, gpointer data)
{
    app_t *app = data;
    GdkRectangle *area = &event->expose.area;
    cairo_surface_t *surface;
    pixman_image_t *tmp, *final;
    cairo_t *cr;
    uint32_t *pixels;

    tmp = pixman_image_create_bits (
	app->format, area->width, area->height, NULL, 0);
    pixman_image_set_dither (tmp, app->dither);

    pixman_image_composite (
	PIXMAN_OP_SRC,
	app->original, NULL, tmp,
	area->x, area->y, 0, 0, 0, 0,
	app->width - area->x,
	app->height - area->y);

    pixels = calloc (1, area->width * area->height * 4);
    final = pixman_image_create_bits (
	PIXMAN_a8r8g8b8, area->width, area->height, pixels, area->width * 4);

    pixman_image_composite (
	PIXMAN_OP_SRC,
	tmp, NULL, final,
	area->x, area->y, 0, 0, 0, 0,
	app->width - area->x,
	app->height - area->y);

    surface = cairo_image_surface_create_for_data (
	(uint8_t *)pixels, CAIRO_FORMAT_ARGB32,
	area->width, area->height, area->width * 4);

    cr = gdk_cairo_create (da->window);

    cairo_set_source_surface (cr, surface, area->x, area->y);

    cairo_paint (cr);

    cairo_destroy (cr);
    cairo_surface_destroy (surface);
    free (pixels);
    pixman_image_unref (final);
    pixman_image_unref (tmp);

    return TRUE;
}

static void
set_up_combo_box (app_t *app, const char *box_name,
		  int n_entries, const named_int_t table[])
{
    GtkWidget *widget = get_widget (app, box_name);
    GtkListStore *model;
    GtkCellRenderer *cell;
    int i;

    model = gtk_list_store_new (1, G_TYPE_STRING);

    cell = gtk_cell_renderer_text_new ();
    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (widget), cell, TRUE);
    gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (widget), cell,
				    "text", 0,
				    NULL);

    gtk_combo_box_set_model (GTK_COMBO_BOX (widget), GTK_TREE_MODEL (model));

    for (i = 0; i < n_entries; ++i)
    {
	const named_int_t *info = &(table[i]);
	GtkTreeIter iter;

	gtk_list_store_append (model, &iter);
	gtk_list_store_set (model, &iter, 0, info->name, -1);
    }

    gtk_combo_box_set_active (GTK_COMBO_BOX (widget), 0);

    g_signal_connect (widget, "changed", G_CALLBACK (rescale), app);
}

static app_t *
app_new (pixman_image_t *original)
{
    GtkWidget *widget;
    app_t *app = g_malloc (sizeof *app);
    GError *err = NULL;

    app->builder = gtk_builder_new ();
    app->original = original;

    if (original->type == BITS)
    {
	app->width = pixman_image_get_width (original);
	app->height = pixman_image_get_height (original);
    }
    else
    {
	app->width = WIDTH;
	app->height = HEIGHT;
    }

    if (!gtk_builder_add_from_file (app->builder, "dither.ui", &err))
	g_error ("Could not read file dither.ui: %s", err->message);

    widget = get_widget (app, "drawing_area");
    g_signal_connect (widget, "expose_event", G_CALLBACK (on_expose), app);

    set_up_combo_box (app, "target_format_combo_box",
		      G_N_ELEMENTS (formats), formats);
    set_up_combo_box (app, "dithering_combo_box",
		      G_N_ELEMENTS (dithers), dithers);

    app->dither = get_value (app, dithers, "dithering_combo_box");
    app->format = get_value (app, formats, "target_format_combo_box");

    rescale (NULL, app);

    return app;
}

int
main (int argc, char **argv)
{
    GtkWidget *window;
    pixman_image_t *image;
    app_t *app;

    gtk_init (&argc, &argv);

    if (argc < 2)
    {
	pixman_gradient_stop_t stops[] = {
	    /* These colors make it very obvious that dithering
	     * is useful even for 8-bit gradients
	     */
	    { 0x00000, { 0x1b1b, 0x5d5d, 0x7c7c, 0xffff } },
	    { 0x10000, { 0x3838, 0x3232, 0x1010, 0xffff } },
	};
	pixman_point_fixed_t p1, p2;

	p1.x = p1.y = 0x0000;
	p2.x = WIDTH << 16;
	p2.y = HEIGHT << 16;

	if (!(image = pixman_image_create_linear_gradient (
		  &p1, &p2, stops, ARRAY_LENGTH (stops))))
	{
	    printf ("Could not create gradient\n");
	    return -1;
	}
    }
    else if (!(image = pixman_image_from_file (argv[1], PIXMAN_a8r8g8b8)))
    {
	printf ("Could not load image \"%s\"\n", argv[1]);
	return -1;
    }

    app = app_new (image);

    window = get_widget (app, "main");

    g_signal_connect (window, "delete_event", G_CALLBACK (gtk_main_quit), NULL);

    gtk_window_set_default_size (GTK_WINDOW (window), 1024, 768);

    gtk_widget_show_all (window);

    gtk_main ();

    return 0;
}