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| 1 #if !defined(_FXFT_VERSION_) || _FXFT_VERSION_ == 2501 | |
| 2 /***************************************************************************/ | |
| 3 /* */ | |
| 4 /* ftlcdfil.c */ | |
| 5 /* */ | |
| 6 /* FreeType API for color filtering of subpixel bitmap glyphs (body). */ | |
| 7 /* */ | |
| 8 /* Copyright 2006, 2008-2010, 2013 by */ | |
| 9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 10 /* */ | |
| 11 /* This file is part of the FreeType project, and may only be used, */ | |
| 12 /* modified, and distributed under the terms of the FreeType project */ | |
| 13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 14 /* this file you indicate that you have read the license and */ | |
| 15 /* understand and accept it fully. */ | |
| 16 /* */ | |
| 17 /***************************************************************************/ | |
| 18 | |
| 19 #define FT2_BUILD_LIBRARY | |
| 20 #include "../../include/ft2build.h" | |
| 21 #include "../../include/freetype/internal/ftdebug.h" | |
| 22 | |
| 23 #include "../../include/freetype/ftlcdfil.h" | |
| 24 #include "../../include/freetype/ftimage.h" | |
| 25 #include "../../include/freetype/internal/ftobjs.h" | |
| 26 | |
| 27 | |
| 28 #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING | |
| 29 | |
| 30 /* define USE_LEGACY to implement the legacy filter */ | |
| 31 #define USE_LEGACY | |
| 32 | |
| 33 /* FIR filter used by the default and light filters */ | |
| 34 static void | |
| 35 _ft_lcd_filter_fir( FT_Bitmap* bitmap, | |
| 36 FT_Render_Mode mode, | |
| 37 FT_Library library ) | |
| 38 { | |
| 39 FT_Byte* weights = library->lcd_weights; | |
| 40 FT_UInt width = (FT_UInt)bitmap->width; | |
| 41 FT_UInt height = (FT_UInt)bitmap->rows; | |
| 42 | |
| 43 | |
| 44 /* horizontal in-place FIR filter */ | |
| 45 if ( mode == FT_RENDER_MODE_LCD && width >= 4 ) | |
| 46 { | |
| 47 FT_Byte* line = bitmap->buffer; | |
| 48 | |
| 49 | |
| 50 for ( ; height > 0; height--, line += bitmap->pitch ) | |
| 51 { | |
| 52 FT_UInt fir[5]; | |
| 53 FT_UInt val1, xx; | |
| 54 | |
| 55 | |
| 56 val1 = line[0]; | |
| 57 fir[0] = weights[2] * val1; | |
| 58 fir[1] = weights[3] * val1; | |
| 59 fir[2] = weights[4] * val1; | |
| 60 fir[3] = 0; | |
| 61 fir[4] = 0; | |
| 62 | |
| 63 val1 = line[1]; | |
| 64 fir[0] += weights[1] * val1; | |
| 65 fir[1] += weights[2] * val1; | |
| 66 fir[2] += weights[3] * val1; | |
| 67 fir[3] += weights[4] * val1; | |
| 68 | |
| 69 for ( xx = 2; xx < width; xx++ ) | |
| 70 { | |
| 71 FT_UInt val, pix; | |
| 72 | |
| 73 | |
| 74 val = line[xx]; | |
| 75 pix = fir[0] + weights[0] * val; | |
| 76 fir[0] = fir[1] + weights[1] * val; | |
| 77 fir[1] = fir[2] + weights[2] * val; | |
| 78 fir[2] = fir[3] + weights[3] * val; | |
| 79 fir[3] = weights[4] * val; | |
| 80 | |
| 81 pix >>= 8; | |
| 82 pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); | |
| 83 line[xx - 2] = (FT_Byte)pix; | |
| 84 } | |
| 85 | |
| 86 { | |
| 87 FT_UInt pix; | |
| 88 | |
| 89 | |
| 90 pix = fir[0] >> 8; | |
| 91 pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); | |
| 92 line[xx - 2] = (FT_Byte)pix; | |
| 93 | |
| 94 pix = fir[1] >> 8; | |
| 95 pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); | |
| 96 line[xx - 1] = (FT_Byte)pix; | |
| 97 } | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 /* vertical in-place FIR filter */ | |
| 102 else if ( mode == FT_RENDER_MODE_LCD_V && height >= 4 ) | |
| 103 { | |
| 104 FT_Byte* column = bitmap->buffer; | |
| 105 FT_Int pitch = bitmap->pitch; | |
| 106 | |
| 107 | |
| 108 for ( ; width > 0; width--, column++ ) | |
| 109 { | |
| 110 FT_Byte* col = column; | |
| 111 FT_UInt fir[5]; | |
| 112 FT_UInt val1, yy; | |
| 113 | |
| 114 | |
| 115 val1 = col[0]; | |
| 116 fir[0] = weights[2] * val1; | |
| 117 fir[1] = weights[3] * val1; | |
| 118 fir[2] = weights[4] * val1; | |
| 119 fir[3] = 0; | |
| 120 fir[4] = 0; | |
| 121 col += pitch; | |
| 122 | |
| 123 val1 = col[0]; | |
| 124 fir[0] += weights[1] * val1; | |
| 125 fir[1] += weights[2] * val1; | |
| 126 fir[2] += weights[3] * val1; | |
| 127 fir[3] += weights[4] * val1; | |
| 128 col += pitch; | |
| 129 | |
| 130 for ( yy = 2; yy < height; yy++ ) | |
| 131 { | |
| 132 FT_UInt val, pix; | |
| 133 | |
| 134 | |
| 135 val = col[0]; | |
| 136 pix = fir[0] + weights[0] * val; | |
| 137 fir[0] = fir[1] + weights[1] * val; | |
| 138 fir[1] = fir[2] + weights[2] * val; | |
| 139 fir[2] = fir[3] + weights[3] * val; | |
| 140 fir[3] = weights[4] * val; | |
| 141 | |
| 142 pix >>= 8; | |
| 143 pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); | |
| 144 col[-2 * pitch] = (FT_Byte)pix; | |
| 145 col += pitch; | |
| 146 } | |
| 147 | |
| 148 { | |
| 149 FT_UInt pix; | |
| 150 | |
| 151 | |
| 152 pix = fir[0] >> 8; | |
| 153 pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); | |
| 154 col[-2 * pitch] = (FT_Byte)pix; | |
| 155 | |
| 156 pix = fir[1] >> 8; | |
| 157 pix |= (FT_UInt)-(FT_Int)( pix >> 8 ); | |
| 158 col[-pitch] = (FT_Byte)pix; | |
| 159 } | |
| 160 } | |
| 161 } | |
| 162 } | |
| 163 | |
| 164 | |
| 165 #ifdef USE_LEGACY | |
| 166 | |
| 167 /* intra-pixel filter used by the legacy filter */ | |
| 168 static void | |
| 169 _ft_lcd_filter_legacy( FT_Bitmap* bitmap, | |
| 170 FT_Render_Mode mode, | |
| 171 FT_Library library ) | |
| 172 { | |
| 173 FT_UInt width = (FT_UInt)bitmap->width; | |
| 174 FT_UInt height = (FT_UInt)bitmap->rows; | |
| 175 FT_Int pitch = bitmap->pitch; | |
| 176 | |
| 177 static const int filters[3][3] = | |
| 178 { | |
| 179 { 65538 * 9/13, 65538 * 1/6, 65538 * 1/13 }, | |
| 180 { 65538 * 3/13, 65538 * 4/6, 65538 * 3/13 }, | |
| 181 { 65538 * 1/13, 65538 * 1/6, 65538 * 9/13 } | |
| 182 }; | |
| 183 | |
| 184 FT_UNUSED( library ); | |
| 185 | |
| 186 | |
| 187 /* horizontal in-place intra-pixel filter */ | |
| 188 if ( mode == FT_RENDER_MODE_LCD && width >= 3 ) | |
| 189 { | |
| 190 FT_Byte* line = bitmap->buffer; | |
| 191 | |
| 192 | |
| 193 for ( ; height > 0; height--, line += pitch ) | |
| 194 { | |
| 195 FT_UInt xx; | |
| 196 | |
| 197 | |
| 198 for ( xx = 0; xx < width; xx += 3 ) | |
| 199 { | |
| 200 FT_UInt r = 0; | |
| 201 FT_UInt g = 0; | |
| 202 FT_UInt b = 0; | |
| 203 FT_UInt p; | |
| 204 | |
| 205 | |
| 206 p = line[xx]; | |
| 207 r += filters[0][0] * p; | |
| 208 g += filters[0][1] * p; | |
| 209 b += filters[0][2] * p; | |
| 210 | |
| 211 p = line[xx + 1]; | |
| 212 r += filters[1][0] * p; | |
| 213 g += filters[1][1] * p; | |
| 214 b += filters[1][2] * p; | |
| 215 | |
| 216 p = line[xx + 2]; | |
| 217 r += filters[2][0] * p; | |
| 218 g += filters[2][1] * p; | |
| 219 b += filters[2][2] * p; | |
| 220 | |
| 221 line[xx] = (FT_Byte)( r / 65536 ); | |
| 222 line[xx + 1] = (FT_Byte)( g / 65536 ); | |
| 223 line[xx + 2] = (FT_Byte)( b / 65536 ); | |
| 224 } | |
| 225 } | |
| 226 } | |
| 227 else if ( mode == FT_RENDER_MODE_LCD_V && height >= 3 ) | |
| 228 { | |
| 229 FT_Byte* column = bitmap->buffer; | |
| 230 | |
| 231 | |
| 232 for ( ; width > 0; width--, column++ ) | |
| 233 { | |
| 234 FT_Byte* col = column; | |
| 235 FT_Byte* col_end = col + height * pitch; | |
| 236 | |
| 237 | |
| 238 for ( ; col < col_end; col += 3 * pitch ) | |
| 239 { | |
| 240 FT_UInt r = 0; | |
| 241 FT_UInt g = 0; | |
| 242 FT_UInt b = 0; | |
| 243 FT_UInt p; | |
| 244 | |
| 245 | |
| 246 p = col[0]; | |
| 247 r += filters[0][0] * p; | |
| 248 g += filters[0][1] * p; | |
| 249 b += filters[0][2] * p; | |
| 250 | |
| 251 p = col[pitch]; | |
| 252 r += filters[1][0] * p; | |
| 253 g += filters[1][1] * p; | |
| 254 b += filters[1][2] * p; | |
| 255 | |
| 256 p = col[pitch * 2]; | |
| 257 r += filters[2][0] * p; | |
| 258 g += filters[2][1] * p; | |
| 259 b += filters[2][2] * p; | |
| 260 | |
| 261 col[0] = (FT_Byte)( r / 65536 ); | |
| 262 col[pitch] = (FT_Byte)( g / 65536 ); | |
| 263 col[2 * pitch] = (FT_Byte)( b / 65536 ); | |
| 264 } | |
| 265 } | |
| 266 } | |
| 267 } | |
| 268 | |
| 269 #endif /* USE_LEGACY */ | |
| 270 | |
| 271 | |
| 272 FT_EXPORT_DEF( FT_Error ) | |
| 273 FT_Library_SetLcdFilterWeights( FT_Library library, | |
| 274 unsigned char *weights ) | |
| 275 { | |
| 276 if ( !library || !weights ) | |
| 277 return FT_THROW( Invalid_Argument ); | |
| 278 | |
| 279 ft_memcpy( library->lcd_weights, weights, 5 ); | |
| 280 | |
| 281 return FT_Err_Ok; | |
| 282 } | |
| 283 | |
| 284 | |
| 285 FT_EXPORT_DEF( FT_Error ) | |
| 286 FT_Library_SetLcdFilter( FT_Library library, | |
| 287 FT_LcdFilter filter ) | |
| 288 { | |
| 289 static const FT_Byte light_filter[5] = | |
| 290 { 0x00, 0x55, 0x56, 0x55, 0x00 }; | |
| 291 /* the values here sum up to a value larger than 256, */ | |
| 292 /* providing a cheap gamma correction */ | |
| 293 static const FT_Byte default_filter[5] = | |
| 294 { 0x10, 0x40, 0x70, 0x40, 0x10 }; | |
| 295 | |
| 296 | |
| 297 if ( !library ) | |
| 298 return FT_THROW( Invalid_Argument ); | |
| 299 | |
| 300 switch ( filter ) | |
| 301 { | |
| 302 case FT_LCD_FILTER_NONE: | |
| 303 library->lcd_filter_func = NULL; | |
| 304 library->lcd_extra = 0; | |
| 305 break; | |
| 306 | |
| 307 case FT_LCD_FILTER_DEFAULT: | |
| 308 #if defined( FT_FORCE_LEGACY_LCD_FILTER ) | |
| 309 | |
| 310 library->lcd_filter_func = _ft_lcd_filter_legacy; | |
| 311 library->lcd_extra = 0; | |
| 312 | |
| 313 #elif defined( FT_FORCE_LIGHT_LCD_FILTER ) | |
| 314 | |
| 315 ft_memcpy( library->lcd_weights, light_filter, 5 ); | |
| 316 library->lcd_filter_func = _ft_lcd_filter_fir; | |
| 317 library->lcd_extra = 2; | |
| 318 | |
| 319 #else | |
| 320 | |
| 321 ft_memcpy( library->lcd_weights, default_filter, 5 ); | |
| 322 library->lcd_filter_func = _ft_lcd_filter_fir; | |
| 323 library->lcd_extra = 2; | |
| 324 | |
| 325 #endif | |
| 326 | |
| 327 break; | |
| 328 | |
| 329 case FT_LCD_FILTER_LIGHT: | |
| 330 ft_memcpy( library->lcd_weights, light_filter, 5 ); | |
| 331 library->lcd_filter_func = _ft_lcd_filter_fir; | |
| 332 library->lcd_extra = 2; | |
| 333 break; | |
| 334 | |
| 335 #ifdef USE_LEGACY | |
| 336 | |
| 337 case FT_LCD_FILTER_LEGACY: | |
| 338 library->lcd_filter_func = _ft_lcd_filter_legacy; | |
| 339 library->lcd_extra = 0; | |
| 340 break; | |
| 341 | |
| 342 #endif | |
| 343 | |
| 344 default: | |
| 345 return FT_THROW( Invalid_Argument ); | |
| 346 } | |
| 347 | |
| 348 library->lcd_filter = filter; | |
| 349 | |
| 350 return FT_Err_Ok; | |
| 351 } | |
| 352 | |
| 353 #else /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ | |
| 354 | |
| 355 FT_EXPORT_DEF( FT_Error ) | |
| 356 FT_Library_SetLcdFilterWeights( FT_Library library, | |
| 357 unsigned char *weights ) | |
| 358 { | |
| 359 FT_UNUSED( library ); | |
| 360 FT_UNUSED( weights ); | |
| 361 | |
| 362 return FT_THROW( Unimplemented_Feature ); | |
| 363 } | |
| 364 | |
| 365 | |
| 366 FT_EXPORT_DEF( FT_Error ) | |
| 367 FT_Library_SetLcdFilter( FT_Library library, | |
| 368 FT_LcdFilter filter ) | |
| 369 { | |
| 370 FT_UNUSED( library ); | |
| 371 FT_UNUSED( filter ); | |
| 372 | |
| 373 return FT_THROW( Unimplemented_Feature ); | |
| 374 } | |
| 375 | |
| 376 #endif /* !FT_CONFIG_OPTION_SUBPIXEL_RENDERING */ | |
| 377 | |
| 378 | |
| 379 /* END */ | |
| 380 #endif | |
| 381 | |
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Chromium Code Reviews
Issue 815103002:
Update freetype to 2.5.4. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master