1ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#if !defined(_FXFT_VERSION_) || _FXFT_VERSION_ == 2501 2ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/***************************************************************************/ 3ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* */ 4ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* ftlcdfil.c */ 5ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* */ 6ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* FreeType API for color filtering of subpixel bitmap glyphs (body). */ 7ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* */ 8ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* Copyright 2006, 2008-2010, 2013 by */ 9ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* David Turner, Robert Wilhelm, and Werner Lemberg. */ 10ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* */ 11ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* This file is part of the FreeType project, and may only be used, */ 12ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* modified, and distributed under the terms of the FreeType project */ 13ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ 14ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* this file you indicate that you have read the license and */ 15ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* understand and accept it fully. */ 16ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* */ 17ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/***************************************************************************/ 18ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 19ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#define FT2_BUILD_LIBRARY 20ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "../../include/ft2build.h" 21ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "../../include/freetype/internal/ftdebug.h" 22ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 23ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "../../include/freetype/ftlcdfil.h" 24ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "../../include/freetype/ftimage.h" 25ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#include "../../include/freetype/internal/ftobjs.h" 26ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 27ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 28ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING 29ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 30ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* define USE_LEGACY to implement the legacy filter */ 31ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#define USE_LEGACY 32ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 33ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* FIR filter used by the default and light filters */ 34ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov static void 35ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov _ft_lcd_filter_fir( FT_Bitmap* bitmap, 36ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Render_Mode mode, 37ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Library library ) 38ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 39ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* weights = library->lcd_weights; 40ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt width = (FT_UInt)bitmap->width; 41ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt height = (FT_UInt)bitmap->rows; 42ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 43ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 44ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* horizontal in-place FIR filter */ 45ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if ( mode == FT_RENDER_MODE_LCD && width >= 4 ) 46ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 47ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* line = bitmap->buffer; 48ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 49ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 50ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( ; height > 0; height--, line += bitmap->pitch ) 51ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 52ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt fir[5]; 53ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt val1, xx; 54ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 55ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 56ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov val1 = line[0]; 57ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[0] = weights[2] * val1; 58ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[1] = weights[3] * val1; 59ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[2] = weights[4] * val1; 60ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[3] = 0; 61ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[4] = 0; 62ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 63ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov val1 = line[1]; 64ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[0] += weights[1] * val1; 65ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[1] += weights[2] * val1; 66ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[2] += weights[3] * val1; 67ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[3] += weights[4] * val1; 68ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 69ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( xx = 2; xx < width; xx++ ) 70ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 71ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt val, pix; 72ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 73ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 74ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov val = line[xx]; 75ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix = fir[0] + weights[0] * val; 76ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[0] = fir[1] + weights[1] * val; 77ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[1] = fir[2] + weights[2] * val; 78ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[2] = fir[3] + weights[3] * val; 79ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[3] = weights[4] * val; 80ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 81ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix >>= 8; 82ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); 83ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov line[xx - 2] = (FT_Byte)pix; 84ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 85ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 86ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 87ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt pix; 88ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 89ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 90ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix = fir[0] >> 8; 91ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); 92ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov line[xx - 2] = (FT_Byte)pix; 93ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 94ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix = fir[1] >> 8; 95ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); 96ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov line[xx - 1] = (FT_Byte)pix; 97ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 98ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 99ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 100ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 101ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* vertical in-place FIR filter */ 102ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov else if ( mode == FT_RENDER_MODE_LCD_V && height >= 4 ) 103ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 104ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* column = bitmap->buffer; 105ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Int pitch = bitmap->pitch; 106ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 107ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 108ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( ; width > 0; width--, column++ ) 109ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 110ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* col = column; 111ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt fir[5]; 112ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt val1, yy; 113ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 114ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 115ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov val1 = col[0]; 116ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[0] = weights[2] * val1; 117ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[1] = weights[3] * val1; 118ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[2] = weights[4] * val1; 119ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[3] = 0; 120ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[4] = 0; 121ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col += pitch; 122ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 123ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov val1 = col[0]; 124ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[0] += weights[1] * val1; 125ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[1] += weights[2] * val1; 126ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[2] += weights[3] * val1; 127ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[3] += weights[4] * val1; 128ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col += pitch; 129ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 130ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( yy = 2; yy < height; yy++ ) 131ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 132ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt val, pix; 133ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 134ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 135ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov val = col[0]; 136ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix = fir[0] + weights[0] * val; 137ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[0] = fir[1] + weights[1] * val; 138ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[1] = fir[2] + weights[2] * val; 139ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[2] = fir[3] + weights[3] * val; 140ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov fir[3] = weights[4] * val; 141ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 142ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix >>= 8; 143ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); 144ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col[-2 * pitch] = (FT_Byte)pix; 145ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col += pitch; 146ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 147ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 148ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 149ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt pix; 150ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 151ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 152ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix = fir[0] >> 8; 153ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); 154ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col[-2 * pitch] = (FT_Byte)pix; 155ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 156ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix = fir[1] >> 8; 157ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); 158ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col[-pitch] = (FT_Byte)pix; 159ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 160ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 161ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 162ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 163ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 164ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 165ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef USE_LEGACY 166ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 167ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* intra-pixel filter used by the legacy filter */ 168ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov static void 169ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov _ft_lcd_filter_legacy( FT_Bitmap* bitmap, 170ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Render_Mode mode, 171ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Library library ) 172ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 173ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt width = (FT_UInt)bitmap->width; 174ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt height = (FT_UInt)bitmap->rows; 175ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Int pitch = bitmap->pitch; 176ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 177ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov static const int filters[3][3] = 178ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 179ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 65538 * 9/13, 65538 * 1/6, 65538 * 1/13 }, 180ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 65538 * 3/13, 65538 * 4/6, 65538 * 3/13 }, 181ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 65538 * 1/13, 65538 * 1/6, 65538 * 9/13 } 182ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov }; 183ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 184ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UNUSED( library ); 185ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 186ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 187ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* horizontal in-place intra-pixel filter */ 188ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if ( mode == FT_RENDER_MODE_LCD && width >= 3 ) 189ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 190ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* line = bitmap->buffer; 191ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 192ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 193ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( ; height > 0; height--, line += pitch ) 194ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 195ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt xx; 196ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 197ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 198ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( xx = 0; xx < width; xx += 3 ) 199ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 200ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt r = 0; 201ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt g = 0; 202ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt b = 0; 203ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt p; 204ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 205ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 206ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov p = line[xx]; 207ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov r += filters[0][0] * p; 208ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov g += filters[0][1] * p; 209ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov b += filters[0][2] * p; 210ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 211ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov p = line[xx + 1]; 212ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov r += filters[1][0] * p; 213ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov g += filters[1][1] * p; 214ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov b += filters[1][2] * p; 215ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 216ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov p = line[xx + 2]; 217ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov r += filters[2][0] * p; 218ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov g += filters[2][1] * p; 219ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov b += filters[2][2] * p; 220ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 221ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov line[xx] = (FT_Byte)( r / 65536 ); 222ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov line[xx + 1] = (FT_Byte)( g / 65536 ); 223ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov line[xx + 2] = (FT_Byte)( b / 65536 ); 224ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 225ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 226ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 227ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov else if ( mode == FT_RENDER_MODE_LCD_V && height >= 3 ) 228ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 229ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* column = bitmap->buffer; 230ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 231ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 232ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( ; width > 0; width--, column++ ) 233ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 234ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* col = column; 235ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Byte* col_end = col + height * pitch; 236ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 237ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 238ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov for ( ; col < col_end; col += 3 * pitch ) 239ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 240ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt r = 0; 241ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt g = 0; 242ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt b = 0; 243ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UInt p; 244ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 245ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 246ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov p = col[0]; 247ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov r += filters[0][0] * p; 248ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov g += filters[0][1] * p; 249ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov b += filters[0][2] * p; 250ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 251ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov p = col[pitch]; 252ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov r += filters[1][0] * p; 253ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov g += filters[1][1] * p; 254ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov b += filters[1][2] * p; 255ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 256ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov p = col[pitch * 2]; 257ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov r += filters[2][0] * p; 258ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov g += filters[2][1] * p; 259ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov b += filters[2][2] * p; 260ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 261ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col[0] = (FT_Byte)( r / 65536 ); 262ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col[pitch] = (FT_Byte)( g / 65536 ); 263ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov col[2 * pitch] = (FT_Byte)( b / 65536 ); 264ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 265ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 266ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 267ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 268ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 269ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif /* USE_LEGACY */ 270ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 271ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 272ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_EXPORT_DEF( FT_Error ) 273ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Library_SetLcdFilterWeights( FT_Library library, 274ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov unsigned char *weights ) 275ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 276ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if ( !library || !weights ) 277ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return FT_THROW( Invalid_Argument ); 278ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 279ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov ft_memcpy( library->lcd_weights, weights, 5 ); 280ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 281ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return FT_Err_Ok; 282ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 283ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 284ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 285ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_EXPORT_DEF( FT_Error ) 286ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Library_SetLcdFilter( FT_Library library, 287ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_LcdFilter filter ) 288ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 289ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov static const FT_Byte light_filter[5] = 290ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 0x00, 0x55, 0x56, 0x55, 0x00 }; 291ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* the values here sum up to a value larger than 256, */ 292ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov /* providing a cheap gamma correction */ 293ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov static const FT_Byte default_filter[5] = 294ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 0x10, 0x40, 0x70, 0x40, 0x10 }; 295ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 296ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 297ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov if ( !library ) 298ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return FT_THROW( Invalid_Argument ); 299ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 300ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov switch ( filter ) 301ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 302ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov case FT_LCD_FILTER_NONE: 303ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_filter_func = NULL; 304ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_extra = 0; 305ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov break; 306ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 307ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov case FT_LCD_FILTER_DEFAULT: 308ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#if defined( FT_FORCE_LEGACY_LCD_FILTER ) 309ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 310ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_filter_func = _ft_lcd_filter_legacy; 311ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_extra = 0; 312ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 313ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#elif defined( FT_FORCE_LIGHT_LCD_FILTER ) 314ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 315ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov ft_memcpy( library->lcd_weights, light_filter, 5 ); 316ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_filter_func = _ft_lcd_filter_fir; 317ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_extra = 2; 318ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 319ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else 320ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 321ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov ft_memcpy( library->lcd_weights, default_filter, 5 ); 322ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_filter_func = _ft_lcd_filter_fir; 323ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_extra = 2; 324ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 325ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif 326ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 327ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov break; 328ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 329ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov case FT_LCD_FILTER_LIGHT: 330ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov ft_memcpy( library->lcd_weights, light_filter, 5 ); 331ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_filter_func = _ft_lcd_filter_fir; 332ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_extra = 2; 333ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov break; 334ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 335ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#ifdef USE_LEGACY 336ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 337ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov case FT_LCD_FILTER_LEGACY: 338ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_filter_func = _ft_lcd_filter_legacy; 339ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_extra = 0; 340ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov break; 341ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 342ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif 343ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 344ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov default: 345ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return FT_THROW( Invalid_Argument ); 346ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 347ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 348ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov library->lcd_filter = filter; 349ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 350ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return FT_Err_Ok; 351ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 352ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 353ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ 354ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 355ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_EXPORT_DEF( FT_Error ) 356ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Library_SetLcdFilterWeights( FT_Library library, 357ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov unsigned char *weights ) 358ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 359ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UNUSED( library ); 360ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UNUSED( weights ); 361ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 362ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return FT_THROW( Unimplemented_Feature ); 363ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 364ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 365ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 366ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_EXPORT_DEF( FT_Error ) 367ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_Library_SetLcdFilter( FT_Library library, 368ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_LcdFilter filter ) 369ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov { 370ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UNUSED( library ); 371ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov FT_UNUSED( filter ); 372ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 373ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov return FT_THROW( Unimplemented_Feature ); 374ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov } 375ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 376ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ 377ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 378ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 379ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov/* END */ 380ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov#endif 381ee451cb395940862dad63c85adfe8f2fd55e864cSvet Ganov 382