convince/common/cairo.c

#include <stdint.h>
#include <cairo/cairo.h>
#include "cairo.h"

void cairo_set_source_u32(cairo_t *cairo, uint32_t color) {
	cairo_set_source_rgba(cairo,
			(color >> (3*8) & 0xFF) / 255.0,
			(color >> (2*8) & 0xFF) / 255.0,
			(color >> (1*8) & 0xFF) / 255.0,
			(color >> (0*8) & 0xFF) / 255.0);
}

cairo_subpixel_order_t to_cairo_subpixel_order(enum wl_output_subpixel subpixel) {
	switch (subpixel) {
	case WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB:
		return CAIRO_SUBPIXEL_ORDER_RGB;
	case WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR:
		return CAIRO_SUBPIXEL_ORDER_BGR;
	case WL_OUTPUT_SUBPIXEL_VERTICAL_RGB:
		return CAIRO_SUBPIXEL_ORDER_VRGB;
	case WL_OUTPUT_SUBPIXEL_VERTICAL_BGR:
		return CAIRO_SUBPIXEL_ORDER_VBGR;
	default:
		return CAIRO_SUBPIXEL_ORDER_DEFAULT;
	}
	return CAIRO_SUBPIXEL_ORDER_DEFAULT;
}

cairo_surface_t *cairo_image_surface_scale(cairo_surface_t *image,
		int width, int height) {
	int image_width = cairo_image_surface_get_width(image);
	int image_height = cairo_image_surface_get_height(image);

	cairo_surface_t *new =
		cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
	cairo_t *cairo = cairo_create(new);
	cairo_scale(cairo, (double)width / image_width,
			(double)height / image_height);
	cairo_set_source_surface(cairo, image, 0, 0);

	cairo_paint(cairo);
	cairo_destroy(cairo);
	return new;
}