Werner Lemberg
20 years ago
parent
0418a1c4c5
commit
e97c3bdc29
8 changed files with 459 additions and 108 deletions
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/***************************************************************************/ |
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/* */ |
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/* ftbitmap.h */ |
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/* */ |
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/* FreeType utility functions for converting 1bpp, 2bpp, 4bpp, and 8bpp */ |
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/* bitmaps into 8bpp format (specification). */
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/* */ |
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/* Copyright 2004 by */ |
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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/* */ |
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/* This file is part of the FreeType project, and may only be used, */ |
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/* modified, and distributed under the terms of the FreeType project */ |
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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/* this file you indicate that you have read the license and */ |
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/* understand and accept it fully. */ |
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/* */ |
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/***************************************************************************/ |
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#ifndef __FTBITMAP_H__ |
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#define __FTBITMAP_H__ |
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#include <ft2build.h> |
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#include FT_FREETYPE_H |
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#ifdef FREETYPE_H |
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#error "freetype.h of FreeType 1 has been loaded!" |
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#error "Please fix the directory search order for header files" |
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#error "so that freetype.h of FreeType 2 is found first." |
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#endif |
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FT_BEGIN_HEADER |
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/*************************************************************************/ |
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/* */ |
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/* <Section> */ |
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/* bitmap_handling */ |
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/* */ |
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/*************************************************************************/ |
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/*************************************************************************/ |
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/* */ |
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/* <Function> */ |
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/* FT_Bitmap_New */ |
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/* */ |
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/* <Description> */ |
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/* Initialize a pointer to an FT_Bitmap structure. */ |
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/* */ |
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/* <InOut> */ |
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/* abitmap :: A pointer to the bitmap structure. */ |
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/* */ |
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FT_EXPORT( void ) |
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FT_Bitmap_New( FT_Bitmap *abitmap ); |
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/*************************************************************************/ |
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/* */ |
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/* <Function> */ |
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/* FT_Bitmap_Convert */ |
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/* */ |
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/* <Description> */ |
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/* Convert a bitmap object with depth 1bpp, 2bpp, 4bpp, or 8bpp to a */ |
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/* bitmap object with depth 8bpp, making the number of used bytes per */ |
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/* line (a.k.a. the `pitch') a multiple of `alignment'. */ |
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/* */ |
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/* <Input> */ |
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/* library :: A handle to a library object. */ |
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/* */ |
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/* source :: The source bitmap. */ |
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/* */ |
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/* alignment :: The pitch of the bitmap is a multiple of this */ |
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/* parameter. Common values are 1, 2, or 4. */ |
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/* */ |
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/* <Output> */ |
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/* target :: The target bitmap. */ |
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/* */ |
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/* <Return> */ |
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/* FreeType error code. 0 means success. */ |
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/* */ |
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/* <Note> */ |
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/* It is possible to call @FT_Bitmap_Convert multiple times without */ |
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/* calling @FT_Bitmap_Done (the memory is simply reallocated). */ |
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/* */ |
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/* Use @FT_Bitmap_Done to finally remove the bitmap object. */ |
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/* */ |
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/* The `library' argument is taken to have access to FreeType's */ |
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/* memory handling functions. */ |
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/* */ |
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FT_EXPORT( FT_Error ) |
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FT_Bitmap_Convert( FT_Library library, |
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const FT_Bitmap *source, |
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FT_Bitmap *target, |
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FT_Int alignment ); |
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/*************************************************************************/ |
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/* */ |
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/* <Function> */ |
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/* FT_Bitmap_Done */ |
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/* */ |
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/* <Description> */ |
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/* Destroy a bitmap object created with @FT_Bitmap_New. */ |
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/* */ |
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/* <Input> */ |
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/* library :: A handle to a library object. */ |
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/* */ |
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/* bitmap :: The bitmap object to be freed. */ |
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/* */ |
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/* <Return> */ |
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/* FreeType error code. 0 means success. */ |
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/* */ |
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/* <Note> */ |
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/* The `library' argument is taken to have access to FreeType's */ |
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/* memory handling functions. */ |
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/* */ |
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FT_EXPORT( FT_Error ) |
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FT_Bitmap_Done( FT_Library library, |
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FT_Bitmap *bitmap ); |
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/* */ |
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FT_END_HEADER |
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#endif /* __FTBITMAP_H__ */ |
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/* END */ |
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@ -0,0 +1,262 @@ |
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/***************************************************************************/ |
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/* */ |
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/* ftbitmap.c */ |
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/* */ |
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/* FreeType utility functions for converting 1bpp, 2bpp, 4bpp, and 8bpp */ |
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/* bitmaps into 8bpp format (body). */ |
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/* */ |
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/* Copyright 2004 by */ |
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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/* */ |
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/* This file is part of the FreeType project, and may only be used, */ |
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/* modified, and distributed under the terms of the FreeType project */ |
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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/* this file you indicate that you have read the license and */ |
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/* understand and accept it fully. */ |
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/* */ |
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/***************************************************************************/ |
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#include <ft2build.h> |
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#include FT_FREETYPE_H |
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#include FT_IMAGE_H |
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#include FT_INTERNAL_OBJECTS_H |
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static |
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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 ) |
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FT_Bitmap_New( FT_Bitmap *abitmap ) |
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{ |
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*abitmap = null_bitmap; |
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} |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( FT_Error ) |
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FT_Bitmap_Convert( FT_Library library, |
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const FT_Bitmap *source, |
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FT_Bitmap *target, |
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FT_Int alignment ) |
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{ |
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FT_Error error; |
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FT_Memory memory; |
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FT_Int i, j, old_size; |
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FT_Byte *s, *ss, *t, *tt; |
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if ( !library ) |
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return FT_Err_Invalid_Library_Handle; |
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memory = library->memory; |
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switch ( source->pixel_mode ) |
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{ |
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case FT_PIXEL_MODE_MONO: |
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case FT_PIXEL_MODE_GRAY: |
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case FT_PIXEL_MODE_GRAY2: |
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case FT_PIXEL_MODE_GRAY4: |
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old_size = target->rows * target->pitch; |
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target->pixel_mode = FT_PIXEL_MODE_GRAY; |
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target->rows = source->rows; |
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target->width = source->width; |
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target->pitch = ( source->width + alignment - 1 ) |
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/ alignment * alignment; |
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if ( target->rows * target->pitch > old_size ) |
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if ( FT_QREALLOC( target->buffer, |
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old_size, target->rows * target->pitch ) ) |
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return error; |
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break; |
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default: |
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error = FT_Err_Invalid_Argument; |
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} |
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s = source->buffer; |
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t = target->buffer; |
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switch ( source->pixel_mode ) |
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{ |
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case FT_PIXEL_MODE_MONO: |
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target->num_grays = 2; |
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for ( i = 0; i < source->rows; i++ ) |
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{ |
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ss = s; |
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tt = t; |
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/* get the full bytes */ |
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for ( j = 0; j < ( source->width >> 3 ); j++ ) |
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{ |
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*(tt++) = (FT_Byte)( ( *ss & 0x80 ) >> 7 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x40 ) >> 6 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x20 ) >> 5 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x10 ) >> 4 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x08 ) >> 3 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x04 ) >> 2 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x02 ) >> 1 ); |
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*(tt++) = (FT_Byte)( *ss & 0x01 ); |
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ss++; |
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} |
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/* get remaining pixels (if any) */ |
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switch ( source->width & 7 ) |
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{ |
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case 7: |
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*(tt++) = (FT_Byte)( ( *ss & 0x80 ) >> 7 ); |
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/* fall through */ |
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case 6: |
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*(tt++) = (FT_Byte)( ( *ss & 0x40 ) >> 6 ); |
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/* fall through */ |
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case 5: |
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*(tt++) = (FT_Byte)( ( *ss & 0x20 ) >> 5 ); |
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/* fall through */ |
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case 4: |
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*(tt++) = (FT_Byte)( ( *ss & 0x10 ) >> 4 ); |
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/* fall through */ |
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case 3: |
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*(tt++) = (FT_Byte)( ( *ss & 0x08 ) >> 3 ); |
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/* fall through */ |
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case 2: |
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*(tt++) = (FT_Byte)( ( *ss & 0x04 ) >> 2 ); |
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/* fall through */ |
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case 1: |
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*(tt++) = (FT_Byte)( ( *ss & 0x02 ) >> 1 ); |
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/* fall through */ |
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case 0: |
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break; |
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} |
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s += source->pitch; |
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t += target->pitch; |
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} |
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break; |
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case FT_PIXEL_MODE_GRAY: |
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target->num_grays = 256; |
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for ( i = 0; i < source->rows; i++ ) |
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{ |
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ss = s; |
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tt = t; |
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for ( j = 0; j < source->width; j++ ) |
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*(tt++) = *(ss++); |
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s += source->pitch; |
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t += target->pitch; |
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} |
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break; |
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case FT_PIXEL_MODE_GRAY2: |
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target->num_grays = 4; |
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for ( i = 0; i < source->rows; i++ ) |
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{ |
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ss = s; |
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tt = t; |
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/* get the full bytes */ |
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for ( j = 0; j < ( source->width >> 2 ); j++ ) |
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{ |
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*(tt++) = (FT_Byte)( ( *ss & 0xC0 ) >> 6 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x30 ) >> 4 ); |
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*(tt++) = (FT_Byte)( ( *ss & 0x0C ) >> 2 ); |
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*(tt++) = (FT_Byte)( *ss & 0x03 ); |
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ss++; |
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} |
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/* get remaining pixels (if any) */ |
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switch ( source->width & 3 ) |
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{ |
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case 3: |
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*(tt++) = (FT_Byte)( ( *ss & 0xC0 ) >> 6 ); |
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/* fall through */ |
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case 2: |
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*(tt++) = (FT_Byte)( ( *ss & 0x30 ) >> 4 ); |
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/* fall through */ |
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case 1: |
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*(tt++) = (FT_Byte)( ( *ss & 0x0C ) >> 2 ); |
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/* fall through */ |
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case 0: |
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break; |
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} |
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s += source->pitch; |
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t += target->pitch; |
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} |
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break; |
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case FT_PIXEL_MODE_GRAY4: |
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target->num_grays = 16; |
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for ( i = 0; i < source->rows; i++ ) |
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{ |
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ss = s; |
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tt = t; |
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/* get the full bytes */ |
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for ( j = 0; j < ( source->width >> 1 ); j++ ) |
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{ |
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*(tt++) = (FT_Byte)( ( *ss & 0xF0 ) >> 4 ); |
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*(tt++) = (FT_Byte)( *ss & 0x0F ); |
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ss++; |
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} |
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/* get remaining pixels (if any) */ |
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switch ( source->width & 1 ) |
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{ |
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case 1: |
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*(tt++) = (FT_Byte)( ( *ss & 0xF0 ) >> 4 ); |
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/* fall through */ |
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case 0: |
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break; |
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} |
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s += source->pitch; |
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t += target->pitch; |
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} |
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break; |
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} |
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return error; |
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} |
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/* documentation is in ftbitmap.h */ |
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FT_EXPORT_DEF( FT_Error ) |
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FT_Bitmap_Done( FT_Library library, |
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FT_Bitmap *bitmap ) |
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{ |
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FT_Memory memory; |
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if ( !library ) |
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return FT_Err_Invalid_Library_Handle; |
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if ( !bitmap ) |
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return FT_Err_Invalid_Argument; |
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memory = library->memory; |
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FT_FREE( bitmap->buffer ); |
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*bitmap = null_bitmap; |
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return FT_Err_Ok; |
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} |
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/* END */ |
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