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//
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//
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// Copyright 2011 TheSeven
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//
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//
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// This file is part of emCORE.
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//
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// emCORE is free software: you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation, either version 2 of the
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// License, or (at your option) any later version.
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//
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// emCORE is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with emCORE. If not, see <http://www.gnu.org/licenses/>.
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//
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//
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#include "emcorelib.h"
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#include "dither.h"
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static void dither_slow(int width, int height, void* inbuf, int inx, int iny, int instride,
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void* outbuf, int outx, int outy, int outstride)
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{
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int bpp = lcd_get_bytes_per_pixel();
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int bits = lcd_get_format();
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int swap = bits & BIT(30);
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int rwidth = MAX(7, bits & BITRANGE(0, 3));
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int gwidth = MAX(7, bits & BITRANGE(10, 13));
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int bwidth = MAX(7, bits & BITRANGE(20, 23));
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int rshift = bits & BITRANGE(4, 9);
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int gshift = bits & BITRANGE(14, 19);
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int bshift = bits & BITRANGE(24, 29);
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int roffs = 1 << (6 - rwidth);
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int goffs = 1 << (6 - gwidth);
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int boffs = 1 << (6 - bwidth);
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int rmask = BITRANGE(7 - rwidth, 7);
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int gmask = BITRANGE(7 - gwidth, 7);
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int bmask = BITRANGE(7 - bwidth, 7);
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int rclip = 7 - rshift;
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int gclip = 7 - gshift;
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int bclip = 7 - bshift;
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char* in = ((char*)inbuf) + (instride * iny + inx) * 3;
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char* out = ((char*)outbuf) + (instride * iny + inx) * bpp;
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int x, y;
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for (y = 0; y < height; y++)
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{
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for (x = 0; x < width; x++)
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{
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int origb = *in++;
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int origg = *in++;
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int origr = *in++;
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int realr = origr >> rclip;
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int realg = origg >> gclip;
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int realb = origb >> bclip;
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int errr = origr - (realr << rclip) - roffs;
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int errg = origg - (realg << gclip) - goffs;
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int errb = origb - (realb << bclip) - boffs;
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if (x + 1 < width)
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{
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*(in + 0) = MAX(0, MIN(255, *(in + 0) + errb / 2));
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*(in + 1) = MAX(0, MIN(255, *(in + 1) + errg / 2));
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*(in + 2) = MAX(0, MIN(255, *(in + 2) + errr / 2));
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}
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if (y + 1 < height)
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{
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*(in + 3 * instride - 1) = MAX(0, MIN(255, *(in + 3 * instride - 1) + errr / 4));
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*(in + 3 * instride - 2) = MAX(0, MIN(255, *(in + 3 * instride - 2) + errg / 4));
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*(in + 3 * instride - 3) = MAX(0, MIN(255, *(in + 3 * instride - 3) + errb / 4));
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*(in + 3 * instride - 4) = MAX(0, MIN(255, *(in + 3 * instride - 4) + errr / 4));
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*(in + 3 * instride - 5) = MAX(0, MIN(255, *(in + 3 * instride - 5) + errg / 4));
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*(in + 3 * instride - 6) = MAX(0, MIN(255, *(in + 3 * instride - 6) + errb / 4));
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}
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int pixel = (realr << rshift) | (realg << gshift) | (realb << bshift);
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if (bpp == 1) *out = pixel;
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else if (bpp == 2)
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{
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if (swap) *((short*)out) = (pixel >> 8) | ((pixel << 8) & 0xff00);
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else *((short*)out) = pixel;
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}
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else if (bpp == 3)
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{
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if (swap)
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{
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*(out + 0) = pixel & 0xff;
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*(out + 1) = (pixel >> 8) & 0xff;
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*(out + 2) = (pixel >> 16) & 0xff;
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}
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else
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{
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*(out + 0) = (pixel >> 16) & 0xff;
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*(out + 1) = (pixel >> 8) & 0xff;
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*(out + 2) = pixel & 0xff;
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}
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}
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else if (bpp == 4)
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{
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if (swap) *((int*)out) = (pixel >> 24) | ((pixel >> 8) & 0xff00)
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| ((pixel << 8) & 0xff0000) | ((pixel << 24) & 0xff000000);
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else *((int*)out) = pixel;
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}
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out += bpp;
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}
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in += (instride - width) * 3;
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out += (outstride - width) * bpp;
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}
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}
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static void dither_rgb565(int width, int height, void* inbuf, int inx, int iny, int instride,
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void* outbuf, int outx, int outy, int outstride)
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{
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char* in = ((char*)inbuf) + (instride * iny + inx) * 3;
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short* out = ((short*)outbuf) + instride * iny + inx;
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int x, y;
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for (y = 0; y < height; y++)
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{
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for (x = 0; x < width; x++)
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{
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int origb = *in++;
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int origg = *in++;
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int origr = *in++;
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int realr = origr >> 3;
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int realg = origg >> 2;
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int realb = origb >> 3;
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int errr = origr - (realr << 3) - 4;
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int errg = origg - (realg << 2) - 2;
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int errb = origb - (realb << 3) - 4;
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if (x + 1 < width)
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{
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*(in + 0) = MAX(0, MIN(255, *(in + 0) + errb / 2));
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*(in + 1) = MAX(0, MIN(255, *(in + 1) + errg / 2));
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*(in + 2) = MAX(0, MIN(255, *(in + 2) + errr / 2));
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}
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if (y + 1 < height)
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{
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*(in + 3 * instride - 1) = MAX(0, MIN(255, *(in + 3 * instride - 1) + errr / 4));
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*(in + 3 * instride - 2) = MAX(0, MIN(255, *(in + 3 * instride - 2) + errg / 4));
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*(in + 3 * instride - 3) = MAX(0, MIN(255, *(in + 3 * instride - 3) + errb / 4));
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*(in + 3 * instride - 4) = MAX(0, MIN(255, *(in + 3 * instride - 4) + errr / 4));
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*(in + 3 * instride - 5) = MAX(0, MIN(255, *(in + 3 * instride - 5) + errg / 4));
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*(in + 3 * instride - 6) = MAX(0, MIN(255, *(in + 3 * instride - 6) + errb / 4));
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}
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*out++ = (realr << 11) | (realg << 5) | realb;
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}
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in += (instride - width) * 3;
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out += outstride - width;
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}
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}
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void dither(int width, int height, void* inbuf, int inx, int iny, int instride,
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void* outbuf, int outx, int outy, int outstride)
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{
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int bits = lcd_get_format();
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if (bits == 0x004154b1)
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dither_rgb565(width, height, inbuf, inx, iny, instride, outbuf, outx, outy, outstride);
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else dither_slow(width, height, inbuf, inx, iny, instride, outbuf, outx, outy, outstride);
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}
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