summaryrefslogtreecommitdiff
path: root/libs/pixman-0.40.0/demos/radial-test.c
diff options
context:
space:
mode:
authorsanine <sanine.not@pm.me>2023-02-12 23:53:22 -0600
committersanine <sanine.not@pm.me>2023-02-12 23:53:22 -0600
commitf1fe73d1909a2448a004a88362a1a532d0d4f7c3 (patch)
treeab37ae3837e2f858de2932bcee9f26e69fab3db1 /libs/pixman-0.40.0/demos/radial-test.c
parentf567ea1e2798fd3156a416e61f083ea3e6b95719 (diff)
switch to tinyobj and nanovg from assimp and cairo
Diffstat (limited to 'libs/pixman-0.40.0/demos/radial-test.c')
-rw-r--r--libs/pixman-0.40.0/demos/radial-test.c208
1 files changed, 0 insertions, 208 deletions
diff --git a/libs/pixman-0.40.0/demos/radial-test.c b/libs/pixman-0.40.0/demos/radial-test.c
deleted file mode 100644
index 08a367c..0000000
--- a/libs/pixman-0.40.0/demos/radial-test.c
+++ /dev/null
@@ -1,208 +0,0 @@
-#include "../test/utils.h"
-#include "gtk-utils.h"
-
-#define NUM_GRADIENTS 9
-#define NUM_STOPS 3
-#define NUM_REPEAT 4
-#define SIZE 128
-#define WIDTH (SIZE * NUM_GRADIENTS)
-#define HEIGHT (SIZE * NUM_REPEAT)
-
-/*
- * We want to test all the possible relative positions of the start
- * and end circle:
- *
- * - The start circle can be smaller/equal/bigger than the end
- * circle. A radial gradient can be classified in one of these
- * three cases depending on the sign of dr.
- *
- * - The smaller circle can be completely inside/internally
- * tangent/outside (at least in part) of the bigger circle. This
- * classification is the same as the one which can be computed by
- * examining the sign of a = (dx^2 + dy^2 - dr^2).
- *
- * - If the two circles have the same size, neither can be inside or
- * internally tangent
- *
- * This test draws radial gradients whose circles always have the same
- * centers (0, 0) and (1, 0), but with different radiuses. From left
- * to right:
- *
- * - Degenerate start circle completely inside the end circle
- * 0.00 -> 1.75; dr = 1.75 > 0; a = 1 - 1.75^2 < 0
- *
- * - Small start circle completely inside the end circle
- * 0.25 -> 1.75; dr = 1.5 > 0; a = 1 - 1.50^2 < 0
- *
- * - Small start circle internally tangent to the end circle
- * 0.50 -> 1.50; dr = 1.0 > 0; a = 1 - 1.00^2 = 0
- *
- * - Small start circle outside of the end circle
- * 0.50 -> 1.00; dr = 0.5 > 0; a = 1 - 0.50^2 > 0
- *
- * - Start circle with the same size as the end circle
- * 1.00 -> 1.00; dr = 0.0 = 0; a = 1 - 0.00^2 > 0
- *
- * - Small end circle outside of the start circle
- * 1.00 -> 0.50; dr = -0.5 > 0; a = 1 - 0.50^2 > 0
- *
- * - Small end circle internally tangent to the start circle
- * 1.50 -> 0.50; dr = -1.0 > 0; a = 1 - 1.00^2 = 0
- *
- * - Small end circle completely inside the start circle
- * 1.75 -> 0.25; dr = -1.5 > 0; a = 1 - 1.50^2 < 0
- *
- * - Degenerate end circle completely inside the start circle
- * 0.00 -> 1.75; dr = 1.75 > 0; a = 1 - 1.75^2 < 0
- *
- */
-
-const static double radiuses[NUM_GRADIENTS] = {
- 0.00,
- 0.25,
- 0.50,
- 0.50,
- 1.00,
- 1.00,
- 1.50,
- 1.75,
- 1.75
-};
-
-#define double_to_color(x) \
- (((uint32_t) ((x)*65536)) - (((uint32_t) ((x)*65536)) >> 16))
-
-#define PIXMAN_STOP(offset,r,g,b,a) \
- { pixman_double_to_fixed (offset), \
- { \
- double_to_color (r), \
- double_to_color (g), \
- double_to_color (b), \
- double_to_color (a) \
- } \
- }
-
-static const pixman_gradient_stop_t stops[NUM_STOPS] = {
- PIXMAN_STOP (0.0, 1, 0, 0, 0.75),
- PIXMAN_STOP (0.70710678, 0, 1, 0, 0),
- PIXMAN_STOP (1.0, 0, 0, 1, 1)
-};
-
-static pixman_image_t *
-create_radial (int index)
-{
- pixman_point_fixed_t p0, p1;
- pixman_fixed_t r0, r1;
- double x0, x1, radius0, radius1, left, right, center;
-
- x0 = 0;
- x1 = 1;
- radius0 = radiuses[index];
- radius1 = radiuses[NUM_GRADIENTS - index - 1];
-
- /* center the gradient */
- left = MIN (x0 - radius0, x1 - radius1);
- right = MAX (x0 + radius0, x1 + radius1);
- center = (left + right) * 0.5;
- x0 -= center;
- x1 -= center;
-
- /* scale to make it fit within a 1x1 rect centered in (0,0) */
- x0 *= 0.25;
- x1 *= 0.25;
- radius0 *= 0.25;
- radius1 *= 0.25;
-
- p0.x = pixman_double_to_fixed (x0);
- p0.y = pixman_double_to_fixed (0);
-
- p1.x = pixman_double_to_fixed (x1);
- p1.y = pixman_double_to_fixed (0);
-
- r0 = pixman_double_to_fixed (radius0);
- r1 = pixman_double_to_fixed (radius1);
-
- return pixman_image_create_radial_gradient (&p0, &p1,
- r0, r1,
- stops, NUM_STOPS);
-}
-
-static const pixman_repeat_t repeat[NUM_REPEAT] = {
- PIXMAN_REPEAT_NONE,
- PIXMAN_REPEAT_NORMAL,
- PIXMAN_REPEAT_REFLECT,
- PIXMAN_REPEAT_PAD
-};
-
-int
-main (int argc, char **argv)
-{
- pixman_transform_t transform;
- pixman_image_t *src_img, *dest_img;
- int i, j;
-
- enable_divbyzero_exceptions ();
-
- dest_img = pixman_image_create_bits (PIXMAN_a8r8g8b8,
- WIDTH, HEIGHT,
- NULL, 0);
-
- draw_checkerboard (dest_img, 25, 0xffaaaaaa, 0xffbbbbbb);
-
- pixman_transform_init_identity (&transform);
-
- /*
- * The create_radial() function returns gradients centered in the
- * origin and whose interesting part fits a 1x1 square. We want to
- * paint these gradients on a SIZExSIZE square and to make things
- * easier we want the origin in the top-left corner of the square
- * we want to see.
- */
- pixman_transform_translate (NULL, &transform,
- pixman_double_to_fixed (0.5),
- pixman_double_to_fixed (0.5));
-
- pixman_transform_scale (NULL, &transform,
- pixman_double_to_fixed (SIZE),
- pixman_double_to_fixed (SIZE));
-
- /*
- * Gradients are evaluated at the center of each pixel, so we need
- * to translate by half a pixel to trigger some interesting
- * cornercases. In particular, the original implementation of PDF
- * radial gradients tried to divide by 0 when using this transform
- * on the "tangent circles" cases.
- */
- pixman_transform_translate (NULL, &transform,
- pixman_double_to_fixed (0.5),
- pixman_double_to_fixed (0.5));
-
- for (i = 0; i < NUM_GRADIENTS; i++)
- {
- src_img = create_radial (i);
- pixman_image_set_transform (src_img, &transform);
-
- for (j = 0; j < NUM_REPEAT; j++)
- {
- pixman_image_set_repeat (src_img, repeat[j]);
-
- pixman_image_composite32 (PIXMAN_OP_OVER,
- src_img,
- NULL,
- dest_img,
- 0, 0,
- 0, 0,
- i * SIZE, j * SIZE,
- SIZE, SIZE);
-
- }
-
- pixman_image_unref (src_img);
- }
-
- show_image (dest_img);
-
- pixman_image_unref (dest_img);
-
- return 0;
-}