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003ab067da
...support for transparency. Technically, the sixels do not have transparency, but empty pixels are now rendered with the current background color instead of black to make the them appear transparent. Same goes for the black bars. The current background color makes them disappear. There is one technical limitation with the alpha focus highlight patch. The alpha value and background color is taken from the current background color, so when the window is unfocused, images may have the wrong alpha and/or background color. This can't be fixed easily.
116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
// sixel.c (part of mintty)
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// this function is derived from a part of graphics.c
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// in Xterm pl#310 originally written by Ross Combs.
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//
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// Copyright 2013,2014 by Ross Combs
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//
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// All Rights Reserved
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Except as contained in this notice, the name(s) of the above copyright
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// holders shall not be used in advertising or otherwise to promote the
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// sale, use or other dealings in this Software without prior written
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// authorization.
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#define SIXEL_RGB(r, g, b) ((r) + ((g) << 8) + ((b) << 16) + (255 << 24))
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int
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hls_to_rgb(int hue, int lum, int sat)
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{
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double hs = (hue + 240) % 360;
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double hv = hs / 360.0;
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double lv = lum / 100.0;
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double sv = sat / 100.0;
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double c, x, m, c2;
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double r1, g1, b1;
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int r, g, b;
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int hpi;
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if (sat == 0) {
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r = g = b = lum * 255 / 100;
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return SIXEL_RGB(r, g, b);
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}
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if ((c2 = ((2.0 * lv) - 1.0)) < 0.0) {
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c2 = -c2;
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}
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c = (1.0 - c2) * sv;
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hpi = (int) (hv * 6.0);
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x = (hpi & 1) ? c : 0.0;
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m = lv - 0.5 * c;
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switch (hpi) {
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case 0:
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r1 = c;
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g1 = x;
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b1 = 0.0;
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break;
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case 1:
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r1 = x;
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g1 = c;
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b1 = 0.0;
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break;
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case 2:
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r1 = 0.0;
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g1 = c;
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b1 = x;
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break;
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case 3:
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r1 = 0.0;
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g1 = x;
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b1 = c;
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break;
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case 4:
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r1 = x;
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g1 = 0.0;
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b1 = c;
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break;
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case 5:
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r1 = c;
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g1 = 0.0;
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b1 = x;
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break;
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default:
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return SIXEL_RGB(255, 255, 255);
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}
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r = (int) ((r1 + m) * 100.0 + 0.5);
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g = (int) ((g1 + m) * 100.0 + 0.5);
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b = (int) ((b1 + m) * 100.0 + 0.5);
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if (r < 0) {
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r = 0;
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} else if (r > 100) {
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r = 100;
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}
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if (g < 0) {
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g = 0;
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} else if (g > 100) {
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g = 100;
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}
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if (b < 0) {
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b = 0;
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} else if (b > 100) {
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b = 100;
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}
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return SIXEL_RGB(r * 255 / 100, g * 255 / 100, b * 255 / 100);
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}
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