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xenocara/lib/pixman/demos/scale.c

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/*
* Copyright 2012, Red Hat, Inc.
* Copyright 2012, Soren Sandmann
*
* 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.
*
* Author: Soren Sandmann <soren.sandmann@gmail.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <gtk/gtk.h>
#include <pixman.h>
#include <stdlib.h>
#include "gtk-utils.h"
typedef struct
{
GtkBuilder * builder;
pixman_image_t * original;
GtkAdjustment * scale_x_adjustment;
GtkAdjustment * scale_y_adjustment;
GtkAdjustment * rotate_adjustment;
GtkAdjustment * subsample_adjustment;
int scaled_width;
int scaled_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;
}
static double
min4 (double a, double b, double c, double d)
{
double m1, m2;
m1 = MIN (a, b);
m2 = MIN (c, d);
return MIN (m1, m2);
}
static double
max4 (double a, double b, double c, double d)
{
double m1, m2;
m1 = MAX (a, b);
m2 = MAX (c, d);
return MAX (m1, m2);
}
static void
compute_extents (pixman_f_transform_t *trans, double *sx, double *sy)
{
double min_x, max_x, min_y, max_y;
pixman_f_vector_t v[4] =
{
{ { 1, 1, 1 } },
{ { -1, 1, 1 } },
{ { -1, -1, 1 } },
{ { 1, -1, 1 } },
};
pixman_f_transform_point (trans, &v[0]);
pixman_f_transform_point (trans, &v[1]);
pixman_f_transform_point (trans, &v[2]);
pixman_f_transform_point (trans, &v[3]);
min_x = min4 (v[0].v[0], v[1].v[0], v[2].v[0], v[3].v[0]);
max_x = max4 (v[0].v[0], v[1].v[0], v[2].v[0], v[3].v[0]);
min_y = min4 (v[0].v[1], v[1].v[1], v[2].v[1], v[3].v[1]);
max_y = max4 (v[0].v[1], v[1].v[1], v[2].v[1], v[3].v[1]);
*sx = (max_x - min_x) / 2.0;
*sy = (max_y - min_y) / 2.0;
}
typedef struct
{
char name [20];
int value;
} named_int_t;
static const named_int_t filters[] =
{
{ "Box", PIXMAN_KERNEL_BOX },
{ "Impulse", PIXMAN_KERNEL_IMPULSE },
{ "Linear", PIXMAN_KERNEL_LINEAR },
{ "Cubic", PIXMAN_KERNEL_CUBIC },
{ "Lanczos2", PIXMAN_KERNEL_LANCZOS2 },
{ "Lanczos3", PIXMAN_KERNEL_LANCZOS3 },
{ "Lanczos3 Stretched", PIXMAN_KERNEL_LANCZOS3_STRETCHED },
{ "Gaussian", PIXMAN_KERNEL_GAUSSIAN },
};
static const named_int_t repeats[] =
{
{ "None", PIXMAN_REPEAT_NONE },
{ "Normal", PIXMAN_REPEAT_NORMAL },
{ "Reflect", PIXMAN_REPEAT_REFLECT },
{ "Pad", PIXMAN_REPEAT_PAD },
};
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
copy_to_counterpart (app_t *app, GObject *object)
{
static const char *xy_map[] =
{
"reconstruct_x_combo_box", "reconstruct_y_combo_box",
"sample_x_combo_box", "sample_y_combo_box",
"scale_x_adjustment", "scale_y_adjustment",
};
GObject *counterpart = NULL;
int i;
for (i = 0; i < G_N_ELEMENTS (xy_map); i += 2)
{
GObject *x = gtk_builder_get_object (app->builder, xy_map[i]);
GObject *y = gtk_builder_get_object (app->builder, xy_map[i + 1]);
if (object == x)
counterpart = y;
if (object == y)
counterpart = x;
}
if (!counterpart)
return;
if (GTK_IS_COMBO_BOX (counterpart))
{
gtk_combo_box_set_active (
GTK_COMBO_BOX (counterpart),
gtk_combo_box_get_active (
GTK_COMBO_BOX (object)));
}
else if (GTK_IS_ADJUSTMENT (counterpart))
{
gtk_adjustment_set_value (
GTK_ADJUSTMENT (counterpart),
gtk_adjustment_get_value (
GTK_ADJUSTMENT (object)));
}
}
static double
to_scale (double v)
{
return pow (1.15, v);
}
static void
rescale (GtkWidget *may_be_null, app_t *app)
{
pixman_f_transform_t ftransform;
pixman_transform_t transform;
double new_width, new_height;
double fscale_x, fscale_y;
double rotation;
pixman_fixed_t *params;
int n_params;
double sx, sy;
pixman_f_transform_init_identity (&ftransform);
if (may_be_null && gtk_toggle_button_get_active (
GTK_TOGGLE_BUTTON (get_widget (app, "lock_checkbutton"))))
{
copy_to_counterpart (app, G_OBJECT (may_be_null));
}
fscale_x = gtk_adjustment_get_value (app->scale_x_adjustment);
fscale_y = gtk_adjustment_get_value (app->scale_y_adjustment);
rotation = gtk_adjustment_get_value (app->rotate_adjustment);
fscale_x = to_scale (fscale_x);
fscale_y = to_scale (fscale_y);
new_width = pixman_image_get_width (app->original) * fscale_x;
new_height = pixman_image_get_height (app->original) * fscale_y;
pixman_f_transform_scale (&ftransform, NULL, fscale_x, fscale_y);
pixman_f_transform_translate (&ftransform, NULL, - new_width / 2.0, - new_height / 2.0);
rotation = (rotation / 360.0) * 2 * M_PI;
pixman_f_transform_rotate (&ftransform, NULL, cos (rotation), sin (rotation));
pixman_f_transform_translate (&ftransform, NULL, new_width / 2.0, new_height / 2.0);
pixman_f_transform_invert (&ftransform, &ftransform);
compute_extents (&ftransform, &sx, &sy);
pixman_transform_from_pixman_f_transform (&transform, &ftransform);
pixman_image_set_transform (app->original, &transform);
params = pixman_filter_create_separable_convolution (
&n_params,
sx * 65536.0 + 0.5,
sy * 65536.0 + 0.5,
get_value (app, filters, "reconstruct_x_combo_box"),
get_value (app, filters, "reconstruct_y_combo_box"),
get_value (app, filters, "sample_x_combo_box"),
get_value (app, filters, "sample_y_combo_box"),
gtk_adjustment_get_value (app->subsample_adjustment),
gtk_adjustment_get_value (app->subsample_adjustment));
pixman_image_set_filter (app->original, PIXMAN_FILTER_SEPARABLE_CONVOLUTION, params, n_params);
pixman_image_set_repeat (
app->original, get_value (app, repeats, "repeat_combo_box"));
free (params);
app->scaled_width = ceil (new_width);
app->scaled_height = ceil (new_height);
gtk_widget_set_size_request (
get_widget (app, "drawing_area"), new_width + 0.5, new_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;
cairo_t *cr;
uint32_t *pixels;
pixels = calloc (1, area->width * area->height * 4);
tmp = pixman_image_create_bits (
PIXMAN_a8r8g8b8, area->width, area->height, pixels, area->width * 4);
if (area->x < app->scaled_width && area->y < app->scaled_height)
{
pixman_image_composite (
PIXMAN_OP_SRC,
app->original, NULL, tmp,
area->x, area->y, 0, 0, 0, 0,
app->scaled_width - area->x, app->scaled_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 (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 void
set_up_filter_box (app_t *app, const char *box_name)
{
set_up_combo_box (app, box_name, G_N_ELEMENTS (filters), filters);
}
static char *
format_value (GtkWidget *widget, double value)
{
return g_strdup_printf ("%.4f", to_scale (value));
}
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 (!gtk_builder_add_from_file (app->builder, "scale.ui", &err))
g_error ("Could not read file scale.ui: %s", err->message);
app->scale_x_adjustment =
GTK_ADJUSTMENT (gtk_builder_get_object (app->builder, "scale_x_adjustment"));
app->scale_y_adjustment =
GTK_ADJUSTMENT (gtk_builder_get_object (app->builder, "scale_y_adjustment"));
app->rotate_adjustment =
GTK_ADJUSTMENT (gtk_builder_get_object (app->builder, "rotate_adjustment"));
app->subsample_adjustment =
GTK_ADJUSTMENT (gtk_builder_get_object (app->builder, "subsample_adjustment"));
g_signal_connect (app->scale_x_adjustment, "value_changed", G_CALLBACK (rescale), app);
g_signal_connect (app->scale_y_adjustment, "value_changed", G_CALLBACK (rescale), app);
g_signal_connect (app->rotate_adjustment, "value_changed", G_CALLBACK (rescale), app);
g_signal_connect (app->subsample_adjustment, "value_changed", G_CALLBACK (rescale), app);
widget = get_widget (app, "scale_x_scale");
gtk_scale_add_mark (GTK_SCALE (widget), 0.0, GTK_POS_LEFT, NULL);
g_signal_connect (widget, "format_value", G_CALLBACK (format_value), app);
widget = get_widget (app, "scale_y_scale");
gtk_scale_add_mark (GTK_SCALE (widget), 0.0, GTK_POS_LEFT, NULL);
g_signal_connect (widget, "format_value", G_CALLBACK (format_value), app);
widget = get_widget (app, "rotate_scale");
gtk_scale_add_mark (GTK_SCALE (widget), 0.0, GTK_POS_LEFT, NULL);
widget = get_widget (app, "drawing_area");
g_signal_connect (widget, "expose_event", G_CALLBACK (on_expose), app);
set_up_filter_box (app, "reconstruct_x_combo_box");
set_up_filter_box (app, "reconstruct_y_combo_box");
set_up_filter_box (app, "sample_x_combo_box");
set_up_filter_box (app, "sample_y_combo_box");
set_up_combo_box (
app, "repeat_combo_box", G_N_ELEMENTS (repeats), repeats);
g_signal_connect (
gtk_builder_get_object (app->builder, "lock_checkbutton"),
"toggled", G_CALLBACK (rescale), app);
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)
{
printf ("%s <image file>\n", argv[0]);
return -1;
}
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;
}
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