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      1 #include <math.h>
      2 #include "pixman.h"
      3 #include "gtk-utils.h"
      4 
      5 #define F(x)								\
      6     pixman_double_to_fixed (x)
      7 
      8 #define WIDTH 600
      9 #define HEIGHT 300
     10 
     11 static uint16_t
     12 convert_to_srgb (uint16_t in)
     13 {
     14     double d = in * (1/65535.0);
     15     double a = 0.055;
     16 
     17     if (d < 0.0031308)
     18 	d = 12.92 * d;
     19     else
     20 	d = (1 + a) * pow (d, 1 / 2.4) - a;
     21 
     22     return (d * 65535.0) + 0.5;
     23 }
     24 
     25 static void
     26 convert_color (pixman_color_t *dest_srgb, pixman_color_t *linear)
     27 {
     28     dest_srgb->alpha = convert_to_srgb (linear->alpha);
     29     dest_srgb->red = convert_to_srgb (linear->red);
     30     dest_srgb->green = convert_to_srgb (linear->green);
     31     dest_srgb->blue = convert_to_srgb (linear->blue);
     32 }
     33 
     34 int
     35 main (int argc, char **argv)
     36 {
     37     static const pixman_trapezoid_t traps[] =
     38     {
     39 	{ F(10.10), F(280.0),
     40 	  { { F(20.0), F(10.10) },
     41 	    { F(5.3), F(280.0) } },
     42 	  { { F(20.3), F(10.10) },
     43 	    { F(5.6), F(280.0) } }
     44 	},
     45 	{ F(10.10), F(280.0),
     46 	  { { F(40.0), F(10.10) },
     47 	    { F(15.3), F(280.0) } },
     48 	  { { F(41.0), F(10.10) },
     49 	    { F(16.3), F(280.0) } }
     50 	},
     51 	{ F(10.10), F(280.0),
     52 	  { { F(120.0), F(10.10) },
     53 	    { F(5.3), F(280.0) } },
     54 	  { { F(128.3), F(10.10) },
     55 	    { F(6.6), F(280.0) } }
     56 	},
     57 	{ F(10.10), F(280.0),
     58 	  { { F(60.0), F(10.10) },
     59 	    { F(25.3), F(280.0) } },
     60 	  { { F(61.0), F(10.10) },
     61 	    { F(26.3), F(280.0) } }
     62 	},
     63 	{ F(10.10), F(280.0),
     64 	  { { F(90.0), F(10.10) },
     65 	    { F(55.3), F(280.0) } },
     66 	  { { F(93.0), F(10.10) },
     67 	    { F(58.3), F(280.0) } }
     68 	},
     69 	{ F(130.10), F(150.0),
     70 	  { { F(100.0), F(130.10) },
     71 	    { F(250.3), F(150.0) } },
     72 	  { { F(110.0), F(130.10) },
     73 	    { F(260.3), F(150.0) } }
     74 	},
     75 	{ F(170.10), F(240.0),
     76 	  { { F(100.0), F(170.10) },
     77 	    { F(120.3), F(240.0) } },
     78 	  { { F(250.0), F(170.10) },
     79 	    { F(250.3), F(240.0) } }
     80 	},
     81     };
     82 
     83     pixman_image_t *src, *dest_srgb, *dest_linear;
     84     pixman_color_t bg = { 0x0000, 0x0000, 0x0000, 0xffff };
     85     pixman_color_t fg = { 0xffff, 0xffff, 0xffff, 0xffff };
     86     pixman_color_t fg_srgb;
     87     uint32_t *d;
     88 
     89     d = malloc (WIDTH * HEIGHT * 4);
     90 
     91     dest_srgb = pixman_image_create_bits (
     92 	PIXMAN_a8r8g8b8_sRGB, WIDTH, HEIGHT, d, WIDTH * 4);
     93     dest_linear = pixman_image_create_bits (
     94 	PIXMAN_a8r8g8b8, WIDTH, HEIGHT, d, WIDTH * 4);
     95 
     96     src = pixman_image_create_solid_fill (&bg);
     97     pixman_image_composite32 (PIXMAN_OP_SRC,
     98 			      src, NULL, dest_srgb,
     99 			      0, 0, 0, 0, 0, 0, WIDTH, HEIGHT);
    100 
    101     src = pixman_image_create_solid_fill (&fg);
    102 
    103     pixman_composite_trapezoids (PIXMAN_OP_OVER,
    104 				 src, dest_srgb, PIXMAN_a8,
    105 				 0, 0, 10, 10, G_N_ELEMENTS (traps), traps);
    106 
    107     convert_color (&fg_srgb, &fg);
    108     src = pixman_image_create_solid_fill (&fg_srgb);
    109 
    110     pixman_composite_trapezoids (PIXMAN_OP_OVER,
    111 				 src, dest_linear, PIXMAN_a8,
    112 				 0, 0, 310, 10, G_N_ELEMENTS (traps), traps);
    113 
    114     show_image (dest_linear);
    115     pixman_image_unref(dest_linear);
    116     free(d);
    117 
    118     return 0;
    119 }
    120