Attachment 132810 Details for Bug 101866 – example program

example program

raster-source-example.c (text/x-csrc), 1.65 KB, created by Christoph Reiter on 2017-07-21 07:58:22 UTC

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Filename:

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Creator: Christoph Reiter

Created: 2017-07-21 07:58:22 UTC

Size: 1.65 KB

patch

obsolete

>// gcc $(pkg-config --cflags --libs cairo) a.c
>
>#include <cairo/cairo.h>
>
>#include <stdio.h>
>#include <errno.h>
>
>
>static cairo_surface_t *
>red_acquire (cairo_pattern_t *pattern, void *closure,
>             cairo_surface_t *target,
>             const cairo_rectangle_int_t *extents)
>{
>    cairo_surface_t *image;
>    cairo_t *cr;
>
>    printf("pattern in acquire: %p (refcount: %u)\n", pattern, cairo_pattern_get_reference_count(pattern));
>
>    image = cairo_surface_create_similar_image (target,
>                                                CAIRO_FORMAT_RGB24,
>                                                extents->width,
>                                                extents->height);
>    cairo_surface_set_device_offset (image, extents->x, extents->y);
>
>    cr = cairo_create (image);
>    cairo_set_source_rgb (cr, 1, 0, 0);
>    cairo_paint (cr);
>    cairo_destroy (cr);
>
>    return image;
>}
>
>static void
>release (cairo_pattern_t *pattern, void *closure, cairo_surface_t *image)
>{
>    cairo_surface_destroy (image);
>}
>
>static void
>draw (cairo_t *cr)
>{
>    cairo_pattern_t *pattern;
>    cairo_content_t content;
>
>    pattern = cairo_pattern_create_raster_source (NULL, CAIRO_CONTENT_COLOR, 5, 5);
>    printf("pattern in draw: %p (refcount: %u)\n", pattern, cairo_pattern_get_reference_count(pattern));
>    cairo_raster_source_pattern_set_acquire (pattern, red_acquire, release);
>
>    cairo_set_source (cr, pattern);
>    cairo_paint (cr);
>
>    cairo_pattern_destroy (pattern);
>
>    return;
>}
>
>
>int main(void) {
>    cairo_t *cr;
>    cairo_surface_t *surface;
>
>    surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 10, 10);
>    cr = cairo_create (surface);
>
>    draw(cr);
>}

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Attachments on bug 101866: 132810

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