0,0 → 1,758 |
/***************************************************************************/ |
/* */ |
/* ftbitmap.c */ |
/* */ |
/* FreeType utility functions for bitmaps (body). */ |
/* */ |
/* Copyright 2004-2009, 2011, 2013 by */ |
/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
/* */ |
/* This file is part of the FreeType project, and may only be used, */ |
/* modified, and distributed under the terms of the FreeType project */ |
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
/* this file you indicate that you have read the license and */ |
/* understand and accept it fully. */ |
/* */ |
/***************************************************************************/ |
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#include <ft2build.h> |
#include FT_INTERNAL_DEBUG_H |
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#include FT_BITMAP_H |
#include FT_IMAGE_H |
#include FT_INTERNAL_OBJECTS_H |
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static |
const FT_Bitmap null_bitmap = { 0, 0, 0, 0, 0, 0, 0, 0 }; |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( void ) |
FT_Bitmap_New( FT_Bitmap *abitmap ) |
{ |
*abitmap = null_bitmap; |
} |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( FT_Error ) |
FT_Bitmap_Copy( FT_Library library, |
const FT_Bitmap *source, |
FT_Bitmap *target) |
{ |
FT_Memory memory = library->memory; |
FT_Error error = FT_Err_Ok; |
FT_Int pitch = source->pitch; |
FT_ULong size; |
|
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if ( source == target ) |
return FT_Err_Ok; |
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if ( source->buffer == NULL ) |
{ |
*target = *source; |
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return FT_Err_Ok; |
} |
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if ( pitch < 0 ) |
pitch = -pitch; |
size = (FT_ULong)( pitch * source->rows ); |
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if ( target->buffer ) |
{ |
FT_Int target_pitch = target->pitch; |
FT_ULong target_size; |
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if ( target_pitch < 0 ) |
target_pitch = -target_pitch; |
target_size = (FT_ULong)( target_pitch * target->rows ); |
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if ( target_size != size ) |
(void)FT_QREALLOC( target->buffer, target_size, size ); |
} |
else |
(void)FT_QALLOC( target->buffer, size ); |
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if ( !error ) |
{ |
unsigned char *p; |
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p = target->buffer; |
*target = *source; |
target->buffer = p; |
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FT_MEM_COPY( target->buffer, source->buffer, size ); |
} |
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return error; |
} |
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static FT_Error |
ft_bitmap_assure_buffer( FT_Memory memory, |
FT_Bitmap* bitmap, |
FT_UInt xpixels, |
FT_UInt ypixels ) |
{ |
FT_Error error; |
int pitch; |
int new_pitch; |
FT_UInt bpp; |
FT_Int i, width, height; |
unsigned char* buffer = NULL; |
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width = bitmap->width; |
height = bitmap->rows; |
pitch = bitmap->pitch; |
if ( pitch < 0 ) |
pitch = -pitch; |
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switch ( bitmap->pixel_mode ) |
{ |
case FT_PIXEL_MODE_MONO: |
bpp = 1; |
new_pitch = ( width + xpixels + 7 ) >> 3; |
break; |
case FT_PIXEL_MODE_GRAY2: |
bpp = 2; |
new_pitch = ( width + xpixels + 3 ) >> 2; |
break; |
case FT_PIXEL_MODE_GRAY4: |
bpp = 4; |
new_pitch = ( width + xpixels + 1 ) >> 1; |
break; |
case FT_PIXEL_MODE_GRAY: |
case FT_PIXEL_MODE_LCD: |
case FT_PIXEL_MODE_LCD_V: |
bpp = 8; |
new_pitch = ( width + xpixels ); |
break; |
default: |
return FT_THROW( Invalid_Glyph_Format ); |
} |
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/* if no need to allocate memory */ |
if ( ypixels == 0 && new_pitch <= pitch ) |
{ |
/* zero the padding */ |
FT_Int bit_width = pitch * 8; |
FT_Int bit_last = ( width + xpixels ) * bpp; |
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if ( bit_last < bit_width ) |
{ |
FT_Byte* line = bitmap->buffer + ( bit_last >> 3 ); |
FT_Byte* end = bitmap->buffer + pitch; |
FT_Int shift = bit_last & 7; |
FT_UInt mask = 0xFF00U >> shift; |
FT_Int count = height; |
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for ( ; count > 0; count--, line += pitch, end += pitch ) |
{ |
FT_Byte* write = line; |
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if ( shift > 0 ) |
{ |
write[0] = (FT_Byte)( write[0] & mask ); |
write++; |
} |
if ( write < end ) |
FT_MEM_ZERO( write, end-write ); |
} |
} |
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return FT_Err_Ok; |
} |
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if ( FT_QALLOC_MULT( buffer, new_pitch, bitmap->rows + ypixels ) ) |
return error; |
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if ( bitmap->pitch > 0 ) |
{ |
FT_Int len = ( width * bpp + 7 ) >> 3; |
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for ( i = 0; i < bitmap->rows; i++ ) |
FT_MEM_COPY( buffer + new_pitch * ( ypixels + i ), |
bitmap->buffer + pitch * i, len ); |
} |
else |
{ |
FT_Int len = ( width * bpp + 7 ) >> 3; |
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for ( i = 0; i < bitmap->rows; i++ ) |
FT_MEM_COPY( buffer + new_pitch * i, |
bitmap->buffer + pitch * i, len ); |
} |
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FT_FREE( bitmap->buffer ); |
bitmap->buffer = buffer; |
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if ( bitmap->pitch < 0 ) |
new_pitch = -new_pitch; |
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/* set pitch only, width and height are left untouched */ |
bitmap->pitch = new_pitch; |
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return FT_Err_Ok; |
} |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( FT_Error ) |
FT_Bitmap_Embolden( FT_Library library, |
FT_Bitmap* bitmap, |
FT_Pos xStrength, |
FT_Pos yStrength ) |
{ |
FT_Error error; |
unsigned char* p; |
FT_Int i, x, y, pitch; |
FT_Int xstr, ystr; |
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if ( !library ) |
return FT_THROW( Invalid_Library_Handle ); |
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if ( !bitmap || !bitmap->buffer ) |
return FT_THROW( Invalid_Argument ); |
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if ( ( ( FT_PIX_ROUND( xStrength ) >> 6 ) > FT_INT_MAX ) || |
( ( FT_PIX_ROUND( yStrength ) >> 6 ) > FT_INT_MAX ) ) |
return FT_THROW( Invalid_Argument ); |
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xstr = (FT_Int)FT_PIX_ROUND( xStrength ) >> 6; |
ystr = (FT_Int)FT_PIX_ROUND( yStrength ) >> 6; |
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if ( xstr == 0 && ystr == 0 ) |
return FT_Err_Ok; |
else if ( xstr < 0 || ystr < 0 ) |
return FT_THROW( Invalid_Argument ); |
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switch ( bitmap->pixel_mode ) |
{ |
case FT_PIXEL_MODE_GRAY2: |
case FT_PIXEL_MODE_GRAY4: |
{ |
FT_Bitmap tmp; |
FT_Int align; |
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if ( bitmap->pixel_mode == FT_PIXEL_MODE_GRAY2 ) |
align = ( bitmap->width + xstr + 3 ) / 4; |
else |
align = ( bitmap->width + xstr + 1 ) / 2; |
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FT_Bitmap_New( &tmp ); |
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error = FT_Bitmap_Convert( library, bitmap, &tmp, align ); |
if ( error ) |
return error; |
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FT_Bitmap_Done( library, bitmap ); |
*bitmap = tmp; |
} |
break; |
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case FT_PIXEL_MODE_MONO: |
if ( xstr > 8 ) |
xstr = 8; |
break; |
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case FT_PIXEL_MODE_LCD: |
xstr *= 3; |
break; |
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case FT_PIXEL_MODE_LCD_V: |
ystr *= 3; |
break; |
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case FT_PIXEL_MODE_BGRA: |
/* We don't embolden color glyphs. */ |
return FT_Err_Ok; |
} |
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error = ft_bitmap_assure_buffer( library->memory, bitmap, xstr, ystr ); |
if ( error ) |
return error; |
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pitch = bitmap->pitch; |
if ( pitch > 0 ) |
p = bitmap->buffer + pitch * ystr; |
else |
{ |
pitch = -pitch; |
p = bitmap->buffer + pitch * ( bitmap->rows - 1 ); |
} |
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/* for each row */ |
for ( y = 0; y < bitmap->rows ; y++ ) |
{ |
/* |
* Horizontally: |
* |
* From the last pixel on, make each pixel or'ed with the |
* `xstr' pixels before it. |
*/ |
for ( x = pitch - 1; x >= 0; x-- ) |
{ |
unsigned char tmp; |
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tmp = p[x]; |
for ( i = 1; i <= xstr; i++ ) |
{ |
if ( bitmap->pixel_mode == FT_PIXEL_MODE_MONO ) |
{ |
p[x] |= tmp >> i; |
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/* the maximum value of 8 for `xstr' comes from here */ |
if ( x > 0 ) |
p[x] |= p[x - 1] << ( 8 - i ); |
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#if 0 |
if ( p[x] == 0xff ) |
break; |
#endif |
} |
else |
{ |
if ( x - i >= 0 ) |
{ |
if ( p[x] + p[x - i] > bitmap->num_grays - 1 ) |
{ |
p[x] = (unsigned char)(bitmap->num_grays - 1); |
break; |
} |
else |
{ |
p[x] = (unsigned char)(p[x] + p[x-i]); |
if ( p[x] == bitmap->num_grays - 1 ) |
break; |
} |
} |
else |
break; |
} |
} |
} |
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/* |
* Vertically: |
* |
* Make the above `ystr' rows or'ed with it. |
*/ |
for ( x = 1; x <= ystr; x++ ) |
{ |
unsigned char* q; |
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q = p - bitmap->pitch * x; |
for ( i = 0; i < pitch; i++ ) |
q[i] |= p[i]; |
} |
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p += bitmap->pitch; |
} |
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bitmap->width += xstr; |
bitmap->rows += ystr; |
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return FT_Err_Ok; |
} |
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FT_Byte |
ft_gray_for_premultiplied_srgb_bgra( const FT_Byte* bgra ) |
{ |
FT_Long a = bgra[3]; |
FT_Long b = bgra[0]; |
FT_Long g = bgra[1]; |
FT_Long r = bgra[2]; |
FT_Long l; |
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/* |
* Luminosity for sRGB is defined using ~0.2126,0.7152,0.0722 |
* coefficients for RGB channels *on the linear colors*. |
* A gamma of 2.2 is fair to assume. And then, we need to |
* undo the premultiplication too. |
* |
* http://accessibility.kde.org/hsl-adjusted.php |
* |
* We do the computation with integers only. |
*/ |
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/* Undo premultification, get the number in a 16.16 form. */ |
b = FT_MulDiv( b, 65536, a ); |
g = FT_MulDiv( g, 65536, a ); |
r = FT_MulDiv( r, 65536, a ); |
a = a * 256; |
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/* Apply gamma of 2.0 instead of 2.2. */ |
b = FT_MulFix( b, b ); |
g = FT_MulFix( g, g ); |
r = FT_MulFix( r, r ); |
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/* Apply coefficients. */ |
b = FT_MulFix( b, 4731 /* 0.0722 * 65536 */ ); |
g = FT_MulFix( g, 46871 /* 0.7152 * 65536 */ ); |
r = FT_MulFix( r, 13933 /* 0.2126 * 65536 */ ); |
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l = r + g + b; |
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/* |
* Final transparency can be determined this way: |
* |
* - If alpha is zero, we want 0. |
* - If alpha is zero and luminosity is zero, we want 255. |
* - If alpha is zero and luminosity is one, we want 0. |
* |
* So the formula is a * (1 - l). |
*/ |
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return (FT_Byte)( FT_MulFix( 65535 - l, a ) >> 8 ); |
} |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( FT_Error ) |
FT_Bitmap_Convert( FT_Library library, |
const FT_Bitmap *source, |
FT_Bitmap *target, |
FT_Int alignment ) |
{ |
FT_Error error = FT_Err_Ok; |
FT_Memory memory; |
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if ( !library ) |
return FT_THROW( Invalid_Library_Handle ); |
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memory = library->memory; |
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switch ( source->pixel_mode ) |
{ |
case FT_PIXEL_MODE_MONO: |
case FT_PIXEL_MODE_GRAY: |
case FT_PIXEL_MODE_GRAY2: |
case FT_PIXEL_MODE_GRAY4: |
case FT_PIXEL_MODE_LCD: |
case FT_PIXEL_MODE_LCD_V: |
case FT_PIXEL_MODE_BGRA: |
{ |
FT_Int pad; |
FT_Long old_size; |
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old_size = target->rows * target->pitch; |
if ( old_size < 0 ) |
old_size = -old_size; |
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target->pixel_mode = FT_PIXEL_MODE_GRAY; |
target->rows = source->rows; |
target->width = source->width; |
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pad = 0; |
if ( alignment > 0 ) |
{ |
pad = source->width % alignment; |
if ( pad != 0 ) |
pad = alignment - pad; |
} |
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target->pitch = source->width + pad; |
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if ( target->pitch > 0 && |
(FT_ULong)target->rows > FT_ULONG_MAX / target->pitch ) |
return FT_THROW( Invalid_Argument ); |
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if ( target->rows * target->pitch > old_size && |
FT_QREALLOC( target->buffer, |
old_size, target->rows * target->pitch ) ) |
return error; |
} |
break; |
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default: |
error = FT_THROW( Invalid_Argument ); |
} |
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switch ( source->pixel_mode ) |
{ |
case FT_PIXEL_MODE_MONO: |
{ |
FT_Byte* s = source->buffer; |
FT_Byte* t = target->buffer; |
FT_Int i; |
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target->num_grays = 2; |
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for ( i = source->rows; i > 0; i-- ) |
{ |
FT_Byte* ss = s; |
FT_Byte* tt = t; |
FT_Int j; |
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/* get the full bytes */ |
for ( j = source->width >> 3; j > 0; j-- ) |
{ |
FT_Int val = ss[0]; /* avoid a byte->int cast on each line */ |
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tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7 ); |
tt[1] = (FT_Byte)( ( val & 0x40 ) >> 6 ); |
tt[2] = (FT_Byte)( ( val & 0x20 ) >> 5 ); |
tt[3] = (FT_Byte)( ( val & 0x10 ) >> 4 ); |
tt[4] = (FT_Byte)( ( val & 0x08 ) >> 3 ); |
tt[5] = (FT_Byte)( ( val & 0x04 ) >> 2 ); |
tt[6] = (FT_Byte)( ( val & 0x02 ) >> 1 ); |
tt[7] = (FT_Byte)( val & 0x01 ); |
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tt += 8; |
ss += 1; |
} |
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/* get remaining pixels (if any) */ |
j = source->width & 7; |
if ( j > 0 ) |
{ |
FT_Int val = *ss; |
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for ( ; j > 0; j-- ) |
{ |
tt[0] = (FT_Byte)( ( val & 0x80 ) >> 7); |
val <<= 1; |
tt += 1; |
} |
} |
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s += source->pitch; |
t += target->pitch; |
} |
} |
break; |
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case FT_PIXEL_MODE_GRAY: |
case FT_PIXEL_MODE_LCD: |
case FT_PIXEL_MODE_LCD_V: |
{ |
FT_Int width = source->width; |
FT_Byte* s = source->buffer; |
FT_Byte* t = target->buffer; |
FT_Int s_pitch = source->pitch; |
FT_Int t_pitch = target->pitch; |
FT_Int i; |
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target->num_grays = 256; |
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for ( i = source->rows; i > 0; i-- ) |
{ |
FT_ARRAY_COPY( t, s, width ); |
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s += s_pitch; |
t += t_pitch; |
} |
} |
break; |
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case FT_PIXEL_MODE_GRAY2: |
{ |
FT_Byte* s = source->buffer; |
FT_Byte* t = target->buffer; |
FT_Int i; |
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target->num_grays = 4; |
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for ( i = source->rows; i > 0; i-- ) |
{ |
FT_Byte* ss = s; |
FT_Byte* tt = t; |
FT_Int j; |
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/* get the full bytes */ |
for ( j = source->width >> 2; j > 0; j-- ) |
{ |
FT_Int val = ss[0]; |
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tt[0] = (FT_Byte)( ( val & 0xC0 ) >> 6 ); |
tt[1] = (FT_Byte)( ( val & 0x30 ) >> 4 ); |
tt[2] = (FT_Byte)( ( val & 0x0C ) >> 2 ); |
tt[3] = (FT_Byte)( ( val & 0x03 ) ); |
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ss += 1; |
tt += 4; |
} |
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j = source->width & 3; |
if ( j > 0 ) |
{ |
FT_Int val = ss[0]; |
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for ( ; j > 0; j-- ) |
{ |
tt[0] = (FT_Byte)( ( val & 0xC0 ) >> 6 ); |
val <<= 2; |
tt += 1; |
} |
} |
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s += source->pitch; |
t += target->pitch; |
} |
} |
break; |
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case FT_PIXEL_MODE_GRAY4: |
{ |
FT_Byte* s = source->buffer; |
FT_Byte* t = target->buffer; |
FT_Int i; |
|
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target->num_grays = 16; |
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for ( i = source->rows; i > 0; i-- ) |
{ |
FT_Byte* ss = s; |
FT_Byte* tt = t; |
FT_Int j; |
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/* get the full bytes */ |
for ( j = source->width >> 1; j > 0; j-- ) |
{ |
FT_Int val = ss[0]; |
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tt[0] = (FT_Byte)( ( val & 0xF0 ) >> 4 ); |
tt[1] = (FT_Byte)( ( val & 0x0F ) ); |
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ss += 1; |
tt += 2; |
} |
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if ( source->width & 1 ) |
tt[0] = (FT_Byte)( ( ss[0] & 0xF0 ) >> 4 ); |
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s += source->pitch; |
t += target->pitch; |
} |
} |
break; |
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case FT_PIXEL_MODE_BGRA: |
{ |
FT_Byte* s = source->buffer; |
FT_Byte* t = target->buffer; |
FT_Int s_pitch = source->pitch; |
FT_Int t_pitch = target->pitch; |
FT_Int i; |
|
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target->num_grays = 256; |
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for ( i = source->rows; i > 0; i-- ) |
{ |
FT_Byte* ss = s; |
FT_Byte* tt = t; |
FT_Int j; |
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for ( j = source->width; j > 0; j-- ) |
{ |
tt[0] = ft_gray_for_premultiplied_srgb_bgra( ss ); |
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ss += 4; |
tt += 1; |
} |
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s += s_pitch; |
t += t_pitch; |
} |
} |
break; |
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default: |
; |
} |
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return error; |
} |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( FT_Error ) |
FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot slot ) |
{ |
if ( slot && slot->format == FT_GLYPH_FORMAT_BITMAP && |
!( slot->internal->flags & FT_GLYPH_OWN_BITMAP ) ) |
{ |
FT_Bitmap bitmap; |
FT_Error error; |
|
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FT_Bitmap_New( &bitmap ); |
error = FT_Bitmap_Copy( slot->library, &slot->bitmap, &bitmap ); |
if ( error ) |
return error; |
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slot->bitmap = bitmap; |
slot->internal->flags |= FT_GLYPH_OWN_BITMAP; |
} |
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return FT_Err_Ok; |
} |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( FT_Error ) |
FT_Bitmap_Done( FT_Library library, |
FT_Bitmap *bitmap ) |
{ |
FT_Memory memory; |
|
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if ( !library ) |
return FT_THROW( Invalid_Library_Handle ); |
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if ( !bitmap ) |
return FT_THROW( Invalid_Argument ); |
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memory = library->memory; |
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FT_FREE( bitmap->buffer ); |
*bitmap = null_bitmap; |
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return FT_Err_Ok; |
} |
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/* END */ |