C++ (Cpp) _cairo_image_surface_scale_bilinear Examples

Example #1

File: gth-preview-tool.c Project: KapTmaN/gthumb

static void
update_preview_image (GthPreviewTool *self)
{
	cairo_surface_t *image;
	int              width;
	int              height;
	GtkAllocation    allocation;
	int              max_size;

	if (self->priv->preview_image != NULL) {
		cairo_surface_destroy (self->priv->preview_image);
		self->priv->preview_image = NULL;
	}

	image = gth_image_viewer_get_current_image (GTH_IMAGE_VIEWER (self->priv->viewer));
	if (image == NULL)
		return;

	width = cairo_image_surface_get_width (image);
	height = cairo_image_surface_get_height (image);
	gtk_widget_get_allocation (GTK_WIDGET (self->priv->viewer), &allocation);
	max_size = MAX (allocation.width, allocation.height) / G_SQRT2 + 2;
	if (scale_keeping_ratio (&width, &height, max_size, max_size, FALSE))
		self->priv->preview_image = _cairo_image_surface_scale_bilinear (image, width, height);
	else
		self->priv->preview_image = cairo_surface_reference (image);

	self->priv->preview_image_area.width = width;
	self->priv->preview_image_area.height = height;
	self->priv->preview_image_area.x = MAX ((allocation.width - self->priv->preview_image_area.width) / 2 - 0.5, 0);
	self->priv->preview_image_area.y = MAX ((allocation.height - self->priv->preview_image_area.height) / 2 - 0.5, 0);
}

Example #2

File: gth-image-rotator.c Project: JosephMcc/pix

static void
update_image_surface (GthImageRotator *self)
{
	GtkAllocation    allocation;
	cairo_surface_t *image;
	int              max_size;
	int              width;
	int              height;
	cairo_surface_t *preview_image;

	if (self->priv->preview_image != NULL) {
		cairo_surface_destroy (self->priv->preview_image);
		self->priv->preview_image = NULL;
	}

	image = gth_image_viewer_get_current_image (GTH_IMAGE_VIEWER (self->priv->viewer));
	if (image == NULL)
		return;

	self->priv->original_width = cairo_image_surface_get_width (image);
	self->priv->original_height = cairo_image_surface_get_height (image);
	width = self->priv->original_width;
	height = self->priv->original_height;
	gtk_widget_get_allocation (GTK_WIDGET (self->priv->viewer), &allocation);
	max_size = MAX (allocation.width, allocation.height) / G_SQRT2 + 2;
	if (scale_keeping_ratio (&width, &height, max_size, max_size, FALSE))
		preview_image = _cairo_image_surface_scale_bilinear (image, width, height);
	else
		preview_image = cairo_surface_reference (image);

	self->priv->preview_zoom = (double) width / self->priv->original_width;
	self->priv->preview_image = preview_image;
	self->priv->preview_image_area.width = width;
	self->priv->preview_image_area.height = height;
	self->priv->preview_image_area.x = MAX ((allocation.width - self->priv->preview_image_area.width) / 2 - 0.5, 0);
	self->priv->preview_image_area.y = MAX ((allocation.height - self->priv->preview_image_area.height) / 2 - 0.5, 0);

	_gth_image_rotator_update_tranformation_matrix (self);
}

Example #3

File: gth-file-tool-grayscale.c Project: cristiklein/gthumb

static GtkWidget *
gth_file_tool_grayscale_get_options (GthFileTool *base)
{
	GthFileToolGrayscale *self;
	GtkWidget            *window;
	GtkWidget            *viewer_page;
	GtkWidget            *viewer;
	cairo_surface_t      *source;
	GtkWidget            *options;
	int                   width, height;
	GtkAllocation         allocation;

	self = (GthFileToolGrayscale *) base;

	window = gth_file_tool_get_window (base);
	viewer_page = gth_browser_get_viewer_page (GTH_BROWSER (window));
	if (! GTH_IS_IMAGE_VIEWER_PAGE (viewer_page))
		return NULL;

	cairo_surface_destroy (self->priv->destination);
	cairo_surface_destroy (self->priv->preview);

	viewer = gth_image_viewer_page_get_image_viewer (GTH_IMAGE_VIEWER_PAGE (viewer_page));
	source = gth_image_viewer_page_tool_get_source (GTH_IMAGE_VIEWER_PAGE_TOOL (self));
	if (source == NULL)
		return NULL;

	width = cairo_image_surface_get_width (source);
	height = cairo_image_surface_get_height (source);
	gtk_widget_get_allocation (GTK_WIDGET (viewer), &allocation);
	if (scale_keeping_ratio (&width, &height, PREVIEW_SIZE * allocation.width, PREVIEW_SIZE * allocation.height, FALSE))
		self->priv->preview = _cairo_image_surface_scale_bilinear (source, width, height);
	else
		self->priv->preview = cairo_surface_reference (source);

	self->priv->destination = cairo_surface_reference (self->priv->preview);
	self->priv->apply_to_original = FALSE;
	self->priv->closing = FALSE;

	self->priv->builder = _gtk_builder_new_from_file ("grayscale-options.ui", "file_tools");
	options = _gtk_builder_get_widget (self->priv->builder, "options");
	gtk_widget_show (options);

	g_signal_connect (GET_WIDGET ("ok_button"),
			  "clicked",
			  G_CALLBACK (ok_button_clicked_cb),
			  self);
	g_signal_connect_swapped (GET_WIDGET ("cancel_button"),
				  "clicked",
				  G_CALLBACK (gth_file_tool_cancel),
				  self);
	g_signal_connect (GET_WIDGET ("brightness_radiobutton"),
			  "clicked",
			  G_CALLBACK (method_changed_cb),
			  self);
	g_signal_connect (GET_WIDGET ("saturation_radiobutton"),
			  "clicked",
			  G_CALLBACK (method_changed_cb),
			  self);
	g_signal_connect (GET_WIDGET ("average_radiobutton"),
			  "clicked",
			  G_CALLBACK (method_changed_cb),
			  self);
	g_signal_connect (GET_WIDGET ("preview_checkbutton"),
			  "toggled",
			  G_CALLBACK (preview_checkbutton_toggled_cb),
			  self);

	self->priv->preview_tool = gth_preview_tool_new ();
	gth_preview_tool_set_image (GTH_PREVIEW_TOOL (self->priv->preview_tool), self->priv->preview);
	gth_image_viewer_set_tool (GTH_IMAGE_VIEWER (viewer), self->priv->preview_tool);
	apply_changes (self);

	return options;
}