120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
#include <math.h>
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#include "pixman.h"
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#include "gtk-utils.h"
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#define F(x) \
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pixman_double_to_fixed (x)
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#define WIDTH 600
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#define HEIGHT 300
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static uint16_t
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convert_to_srgb (uint16_t in)
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{
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double d = in * (1/65535.0);
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double a = 0.055;
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if (d < 0.0031308)
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d = 12.92 * d;
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else
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d = (1 + a) * pow (d, 1 / 2.4) - a;
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return (d * 65535.0) + 0.5;
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}
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static void
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convert_color (pixman_color_t *dest_srgb, pixman_color_t *linear)
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{
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dest_srgb->alpha = convert_to_srgb (linear->alpha);
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dest_srgb->red = convert_to_srgb (linear->red);
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dest_srgb->green = convert_to_srgb (linear->green);
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dest_srgb->blue = convert_to_srgb (linear->blue);
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}
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int
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main (int argc, char **argv)
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{
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static const pixman_trapezoid_t traps[] =
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{
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{ F(10.10), F(280.0),
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{ { F(20.0), F(10.10) },
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{ F(5.3), F(280.0) } },
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{ { F(20.3), F(10.10) },
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{ F(5.6), F(280.0) } }
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},
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{ F(10.10), F(280.0),
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{ { F(40.0), F(10.10) },
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{ F(15.3), F(280.0) } },
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{ { F(41.0), F(10.10) },
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{ F(16.3), F(280.0) } }
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},
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{ F(10.10), F(280.0),
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{ { F(120.0), F(10.10) },
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{ F(5.3), F(280.0) } },
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{ { F(128.3), F(10.10) },
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{ F(6.6), F(280.0) } }
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},
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{ F(10.10), F(280.0),
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{ { F(60.0), F(10.10) },
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{ F(25.3), F(280.0) } },
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{ { F(61.0), F(10.10) },
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{ F(26.3), F(280.0) } }
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},
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{ F(10.10), F(280.0),
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{ { F(90.0), F(10.10) },
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{ F(55.3), F(280.0) } },
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{ { F(93.0), F(10.10) },
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{ F(58.3), F(280.0) } }
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},
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{ F(130.10), F(150.0),
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{ { F(100.0), F(130.10) },
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{ F(250.3), F(150.0) } },
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{ { F(110.0), F(130.10) },
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{ F(260.3), F(150.0) } }
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},
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{ F(170.10), F(240.0),
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{ { F(100.0), F(170.10) },
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{ F(120.3), F(240.0) } },
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{ { F(250.0), F(170.10) },
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{ F(250.3), F(240.0) } }
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},
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};
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pixman_image_t *src, *dest_srgb, *dest_linear;
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pixman_color_t bg = { 0x0000, 0x0000, 0x0000, 0xffff };
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pixman_color_t fg = { 0xffff, 0xffff, 0xffff, 0xffff };
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pixman_color_t fg_srgb;
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uint32_t *d;
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d = malloc (WIDTH * HEIGHT * 4);
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dest_srgb = pixman_image_create_bits (
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PIXMAN_a8r8g8b8_sRGB, WIDTH, HEIGHT, d, WIDTH * 4);
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dest_linear = pixman_image_create_bits (
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PIXMAN_a8r8g8b8, WIDTH, HEIGHT, d, WIDTH * 4);
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src = pixman_image_create_solid_fill (&bg);
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pixman_image_composite32 (PIXMAN_OP_SRC,
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src, NULL, dest_srgb,
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0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
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src = pixman_image_create_solid_fill (&fg);
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pixman_composite_trapezoids (PIXMAN_OP_OVER,
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src, dest_srgb, PIXMAN_a8,
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0, 0, 10, 10, G_N_ELEMENTS (traps), traps);
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convert_color (&fg_srgb, &fg);
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src = pixman_image_create_solid_fill (&fg_srgb);
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pixman_composite_trapezoids (PIXMAN_OP_OVER,
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src, dest_linear, PIXMAN_a8,
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0, 0, 310, 10, G_N_ELEMENTS (traps), traps);
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show_image (dest_linear);
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pixman_image_unref(dest_linear);
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free(d);
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return 0;
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}
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