scale-offset-similar.c [plain text]
#include "cairo-test.h"
static cairo_surface_t *
create_source (cairo_surface_t *target, int width, int height)
{
cairo_surface_t *similar;
cairo_t *cr;
similar = cairo_surface_create_similar (target,
CAIRO_CONTENT_COLOR,
width, height);
cr = cairo_create (similar);
cairo_surface_destroy (similar);
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_rectangle (cr,
width - 4, height - 4,
2, 2);
cairo_fill (cr);
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_rectangle (cr,
width - 2, height - 4,
2, 2);
cairo_fill (cr);
cairo_set_source_rgb (cr, 0, 1, 0);
cairo_rectangle (cr,
width - 4, height - 2,
2, 2);
cairo_fill (cr);
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_rectangle (cr,
width - 2, height - 2,
2, 2);
cairo_fill (cr);
similar = cairo_surface_reference (cairo_get_target (cr));
cairo_destroy (cr);
return similar;
}
static void
draw_grid (cairo_t *cr, cairo_pattern_t *pattern, int dst_x, int dst_y)
{
cairo_matrix_t m;
cairo_save (cr);
cairo_translate (cr, dst_x, dst_y);
cairo_scale (cr, 16, 16);
cairo_rotate (cr, 1);
cairo_matrix_init_translate (&m, 2560-4, 1280-4);
cairo_pattern_set_matrix (pattern, &m);
cairo_set_source (cr, pattern);
cairo_rectangle (cr, 0, 0, 4, 4);
cairo_fill (cr);
cairo_set_source_rgb (cr, .7, .7, .7);
cairo_set_line_width (cr, 1./16);
cairo_move_to (cr, 0, 0);
cairo_line_to (cr, 4, 0);
cairo_move_to (cr, 0, 2);
cairo_line_to (cr, 4, 2);
cairo_move_to (cr, 0, 4);
cairo_line_to (cr, 4, 4);
cairo_move_to (cr, 0, 0);
cairo_line_to (cr, 0, 4);
cairo_move_to (cr, 2, 0);
cairo_line_to (cr, 2, 4);
cairo_move_to (cr, 4, 0);
cairo_line_to (cr, 4, 4);
cairo_stroke (cr);
cairo_restore (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_surface_t *source;
cairo_pattern_t *pattern;
cairo_paint (cr);
source = create_source (cairo_get_target (cr), 2560, 1280);
pattern = cairo_pattern_create_for_surface (source);
cairo_surface_destroy (source);
cairo_pattern_set_filter (pattern, CAIRO_FILTER_NEAREST);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_NONE);
draw_grid (cr, pattern, 50, 0);
draw_grid (cr, pattern, 130, 0);
draw_grid (cr, pattern, 210, 0);
draw_grid (cr, pattern, 290, 0);
draw_grid (cr, pattern, 50, 230);
draw_grid (cr, pattern, 130, 230);
draw_grid (cr, pattern, 210, 230);
draw_grid (cr, pattern, 290, 230);
cairo_pattern_destroy (pattern);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (scale_offset_similar,
"Tests drawing surfaces under various scales and transforms",
"surface scale-offset",
NULL,
320, 320,
NULL, draw)