Issue #92. New tests for cairo.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/cairo-tests/image-scale.cpp b/src/cairo-tests/image-scale.cpp
index 78cd986..120577c 100644
--- a/src/cairo-tests/image-scale.cpp
+++ b/src/cairo-tests/image-scale.cpp
@@ -13,21 +13,69 @@
 #include "caskbench.h"
 #include "caskbench_context.h"
 #include "cairo-shapes.h"
+#include <math.h>
+
+static cairo_surface_t *image;
 
 int
 ca_setup_image_scale(caskbench_context_t *ctx)
 {
+    int i, x, y;
+    cairo_t *cr_image;
+
+    image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 160, 40);
+    cr_image = cairo_create (image);
+    cairo_set_source_surface (cr_image, image, 0, 0);
+
+    x = 5;
+    for (i=0; i<16; i++) {
+        x += 10;
+        y = (i%2)*10;
+
+        cairo_set_source_rgba (cr_image, 1.0/(i+1), 1.0, 16.0*i/255.0, 1.0);
+        cairo_rectangle (cr_image, x, y, 10, 10);
+        cairo_fill (cr_image);
+    }
+
+    cairo_destroy (cr_image);
+
     return 1;
 }
 
 void
 ca_teardown_image_scale(void)
 {
+    cairo_surface_destroy (image);
 }
 
 int
 ca_test_image_scale(caskbench_context_t *ctx)
 {
+    cairo_t *cr = ctx->cairo_cr;
+
+    int w = ctx->canvas_width;
+    int h = ctx->canvas_height;
+    int iw = cairo_image_surface_get_width (image);
+    int ih = cairo_image_surface_get_height (image);
+    for (int i=0; i<ctx->size; i++) {
+        double x1 = (double)rand()/RAND_MAX * w;
+        double x2 = (double)rand()/RAND_MAX * w;
+        double y1 = (double)rand()/RAND_MAX * h;
+        double y2 = (double)rand()/RAND_MAX * h;
+        double x = MIN(x1, x2);
+        double y = MIN(y1, y2);
+        double width_ratio = float(fabs(x2 - x1)) / float(iw);
+        double height_ratio = float(fabs(y2 - y1)) / float(ih);
+        double scale_xy = MIN(height_ratio, width_ratio);
+
+        cairo_save(cr);
+        cairo_translate(cr,x,y);
+        cairo_scale(cr,scale_xy, scale_xy);
+
+        cairo_set_source_surface (cr, image, 0, 0);
+        cairo_paint (cr);
+        cairo_restore(cr);
+    }
     return 1;
 }