diff options
Diffstat (limited to 'demos')
| -rw-r--r-- | demos/Makefile.am | 2 | ||||
| -rw-r--r-- | demos/srgb-trap-test.c | 119 |
2 files changed, 121 insertions, 0 deletions
diff --git a/demos/Makefile.am b/demos/Makefile.am index d8fb0da..f324f5f 100644 --- a/demos/Makefile.am +++ b/demos/Makefile.am @@ -21,6 +21,7 @@ DEMOS = \ tri-test \ quad2quad \ checkerboard \ + srgb-trap-test \ srgb-test EXTRA_DIST = parrot.c parrot.jpg @@ -37,6 +38,7 @@ radial_test_SOURCES = radial-test.c $(GTK_UTILS) tri_test_SOURCES = tri-test.c $(GTK_UTILS) checkerboard_SOURCES = checkerboard.c $(GTK_UTILS) srgb_test_SOURCES = srgb-test.c $(GTK_UTILS) +srgb_trap_test_SOURCES = srgb-trap-test.c $(GTK_UTILS) noinst_PROGRAMS = $(DEMOS) diff --git a/demos/srgb-trap-test.c b/demos/srgb-trap-test.c new file mode 100644 index 0000000..d5ae16a --- /dev/null +++ b/demos/srgb-trap-test.c @@ -0,0 +1,119 @@ +#include <math.h> +#include "pixman.h" +#include "gtk-utils.h" + +#define F(x) \ + pixman_double_to_fixed (x) + +#define WIDTH 600 +#define HEIGHT 300 + +static uint16_t +convert_to_srgb (uint16_t in) +{ + double d = in * (1/65535.0); + double a = 0.055; + + if (d < 0.0031308) + d = 12.92 * d; + else + d = (1 + a) * pow (d, 1 / 2.4) - a; + + return (d * 65535.0) + 0.5; +} + +static void +convert_color (pixman_color_t *dest_srgb, pixman_color_t *linear) +{ + dest_srgb->alpha = convert_to_srgb (linear->alpha); + dest_srgb->red = convert_to_srgb (linear->red); + dest_srgb->green = convert_to_srgb (linear->green); + dest_srgb->blue = convert_to_srgb (linear->blue); +} + +int +main (int argc, char **argv) +{ + static const pixman_trapezoid_t traps[] = + { + { F(10.10), F(280.0), + { { F(20.0), F(10.10) }, + { F(5.3), F(280.0) } }, + { { F(20.3), F(10.10) }, + { F(5.6), F(280.0) } } + }, + { F(10.10), F(280.0), + { { F(40.0), F(10.10) }, + { F(15.3), F(280.0) } }, + { { F(41.0), F(10.10) }, + { F(16.3), F(280.0) } } + }, + { F(10.10), F(280.0), + { { F(120.0), F(10.10) }, + { F(5.3), F(280.0) } }, + { { F(128.3), F(10.10) }, + { F(6.6), F(280.0) } } + }, + { F(10.10), F(280.0), + { { F(60.0), F(10.10) }, + { F(25.3), F(280.0) } }, + { { F(61.0), F(10.10) }, + { F(26.3), F(280.0) } } + }, + { F(10.10), F(280.0), + { { F(90.0), F(10.10) }, + { F(55.3), F(280.0) } }, + { { F(93.0), F(10.10) }, + { F(58.3), F(280.0) } } + }, + { F(130.10), F(150.0), + { { F(100.0), F(130.10) }, + { F(250.3), F(150.0) } }, + { { F(110.0), F(130.10) }, + { F(260.3), F(150.0) } } + }, + { F(170.10), F(240.0), + { { F(100.0), F(170.10) }, + { F(120.3), F(240.0) } }, + { { F(250.0), F(170.10) }, + { F(250.3), F(240.0) } } + }, + }; + + pixman_image_t *src, *dest_srgb, *dest_linear; + pixman_color_t bg = { 0x0000, 0x0000, 0x0000, 0xffff }; + pixman_color_t fg = { 0xffff, 0xffff, 0xffff, 0xffff }; + pixman_color_t fg_srgb; + uint32_t *d; + + d = malloc (WIDTH * HEIGHT * 4); + + dest_srgb = pixman_image_create_bits ( + PIXMAN_a8r8g8b8_sRGB, WIDTH, HEIGHT, d, WIDTH * 4); + dest_linear = pixman_image_create_bits ( + PIXMAN_a8r8g8b8, WIDTH, HEIGHT, d, WIDTH * 4); + + src = pixman_image_create_solid_fill (&bg); + pixman_image_composite32 (PIXMAN_OP_SRC, + src, NULL, dest_srgb, + 0, 0, 0, 0, 0, 0, WIDTH, HEIGHT); + + src = pixman_image_create_solid_fill (&fg); + + pixman_composite_trapezoids (PIXMAN_OP_OVER, + src, dest_srgb, PIXMAN_a8, + 0, 0, 10, 10, G_N_ELEMENTS (traps), traps); + + convert_color (&fg_srgb, &fg); + src = pixman_image_create_solid_fill (&fg_srgb); + + pixman_composite_trapezoids (PIXMAN_OP_OVER, + src, dest_linear, PIXMAN_a8, + 0, 0, 310, 10, G_N_ELEMENTS (traps), traps); + + show_image (dest_linear); + pixman_image_unref(dest_linear); + free(d); + + return 0; +} |