Attachment 1849 Details for Bug 2488 – C code to generate the PNG

C code to generate the PNG

pixman-bug.c (text/plain), 1.68 KB, created by Kristian Høgsberg on 2005-02-07 09:03:59 UTC

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Creator: Kristian Høgsberg

Created: 2005-02-07 09:03:59 UTC

Size: 1.68 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <string.h>
>#include <math.h>
>
>#include <cairo.h>
>#include <cairo-png.h>
>#include <cairo-pdf.h>
>
>const char filename[] = "clip.png";
>
>#define WIDTH	32
>#define HEIGHT	WIDTH
>#define STEPS	10
>
>#define IMAGE_WIDTH	( (WIDTH / 2 * STEPS) + 3 * WIDTH / 2 )
>#define IMAGE_HEIGHT	IMAGE_WIDTH
>
>int
>main (int argc, char *argv[])
>{
>    FILE *fp;
>    cairo_t *cr;
>    cairo_surface_t *stamp, *target;
>
>    fp = fopen ("pixman-bug.png", "w");
>    target = cairo_png_surface_create (fp, CAIRO_FORMAT_ARGB32,
>				       IMAGE_WIDTH, IMAGE_HEIGHT);
>
>    cr = cairo_create ();
>    stamp = cairo_surface_create_similar (target, CAIRO_FORMAT_ARGB32,
>					  WIDTH, HEIGHT);
>    cairo_set_target_surface (cr, stamp);
>    cairo_new_path (cr);
>    cairo_rectangle (cr, WIDTH / 4, HEIGHT / 4, WIDTH / 2, HEIGHT / 2);
>    cairo_set_rgb_color (cr, 1, 0, 0);
>    cairo_set_alpha (cr, 0.8);
>    cairo_fill (cr);
>
>    cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
>    cairo_set_line_width (cr, 2);
>    cairo_set_rgb_color (cr, 0, 0, 0);
>    cairo_set_alpha (cr, 1);
>    cairo_stroke (cr);
>
>    cairo_set_target_surface (cr, target);
>
>    /* Draw a translucent rectangle for reference where the rotated
>     * image should be. */
>    cairo_new_path (cr);
>    cairo_rectangle (cr, WIDTH, HEIGHT, WIDTH, HEIGHT);
>    cairo_set_rgb_color (cr, 1, 1, 0);
>    cairo_set_alpha (cr, 0.3);
>    cairo_fill (cr);
>
>    cairo_translate (cr, 2 * WIDTH, 2 * HEIGHT);
>    cairo_rotate (cr, M_PI);
>    cairo_set_alpha (cr, 1);
>    cairo_show_surface (cr, stamp, WIDTH + 2, HEIGHT + 2);
>
>    cairo_show_page (cr);
>
>    cairo_surface_destroy (stamp);
>    cairo_surface_destroy (target);
>
>    cairo_destroy (cr);
>
>    return 0;
>}

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