| 1 | /*
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| 2 | * Copyright (c) 2012 Petr Koupy
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup softrend
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| 30 | * @{
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| 31 | */
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| 32 | /**
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| 33 | * @file
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| 34 | */
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| 35 |
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| 36 | #include "compose.h"
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| 37 |
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| 38 | pixel_t compose_clr(pixel_t fg, pixel_t bg)
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| 39 | {
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| 40 | return 0;
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| 41 | }
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| 42 |
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| 43 | pixel_t compose_src(pixel_t fg, pixel_t bg)
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| 44 | {
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| 45 | return fg;
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| 46 | }
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| 47 |
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| 48 | pixel_t compose_dst(pixel_t fg, pixel_t bg)
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| 49 | {
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| 50 | return bg;
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| 51 | }
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| 52 |
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| 53 | pixel_t compose_over(pixel_t fg, pixel_t bg)
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| 54 | {
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| 55 | double mul;
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| 56 | double mul_cmp;
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| 57 |
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| 58 | double res_a;
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| 59 | double res_r;
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| 60 | double res_g;
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| 61 | double res_b;
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| 62 |
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| 63 | if (ALPHA(bg) == 255) {
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| 64 | res_a = 1;
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| 65 | mul = ((double) ALPHA(fg)) / 255.0;
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| 66 | mul_cmp = 1 - mul;
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| 67 | } else {
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| 68 | double fg_a = ((double) ALPHA(fg)) / 255.0;
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| 69 | double bg_a = ((double) ALPHA(bg)) / 255.0;
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| 70 |
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| 71 | res_a = 1 - (1 - fg_a) * (1 - bg_a);
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| 72 | mul = fg_a / res_a;
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| 73 | mul_cmp = 1 - mul;
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| 74 | }
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| 75 |
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| 76 | res_r = mul * ((double) RED(fg)) + mul_cmp * ((double) RED(bg));
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| 77 | res_g = mul * ((double) GREEN(fg)) + mul_cmp * ((double) GREEN(bg));
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| 78 | res_b = mul * ((double) BLUE(fg)) + mul_cmp * ((double) BLUE(bg));
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| 79 |
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| 80 | return PIXEL((unsigned) (res_a * 255),
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| 81 | (unsigned) res_r, (unsigned) res_g, (unsigned) res_b);
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| 82 | }
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| 83 |
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| 84 | pixel_t compose_in(pixel_t fg, pixel_t bg)
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| 85 | {
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| 86 | // TODO
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| 87 | return 0;
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| 88 | }
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| 89 |
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| 90 | pixel_t compose_out(pixel_t fg, pixel_t bg)
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| 91 | {
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| 92 | // TODO
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| 93 | return 0;
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| 94 | }
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| 95 |
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| 96 | pixel_t compose_atop(pixel_t fg, pixel_t bg)
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| 97 | {
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| 98 | // TODO
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| 99 | return 0;
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| 100 | }
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| 101 |
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| 102 | pixel_t compose_xor(pixel_t fg, pixel_t bg)
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| 103 | {
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| 104 | // TODO
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| 105 | return 0;
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| 106 | }
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| 107 |
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| 108 | pixel_t compose_add(pixel_t fg, pixel_t bg)
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| 109 | {
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| 110 | // TODO
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| 111 | return 0;
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| 112 | }
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| 113 |
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| 114 | /** @}
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| 115 | */
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