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author | sanine <sanine.not@pm.me> | 2023-02-12 23:53:22 -0600 |
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committer | sanine <sanine.not@pm.me> | 2023-02-12 23:53:22 -0600 |
commit | f1fe73d1909a2448a004a88362a1a532d0d4f7c3 (patch) | |
tree | ab37ae3837e2f858de2932bcee9f26e69fab3db1 /libs/pixman-0.40.0/demos/radial-test.c | |
parent | f567ea1e2798fd3156a416e61f083ea3e6b95719 (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.c | 208 |
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; -} |