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Diffstat (limited to 'src/pixman/demos/scale.c')
| -rw-r--r-- | src/pixman/demos/scale.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/src/pixman/demos/scale.c b/src/pixman/demos/scale.c new file mode 100644 index 0000000..d00307e --- /dev/null +++ b/src/pixman/demos/scale.c @@ -0,0 +1,436 @@ +/* + * 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; +} |
