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/**************************************************************************** * * ftbitmap.h * * FreeType utility functions for bitmaps (specification). * * Copyright (C) 2004-2020 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. * / #ifndef FTBITMAP_H_ #define FTBITMAP_H_ #include <freetype/freetype.h> #include <freetype/ftcolor.h> #ifdef FREETYPE_H #error "freetype.h of FreeType 1 has been loaded!" #error "Please fix the directory search order for header files" #error "so that freetype.h of FreeType 2 is found first." #endif FT_BEGIN_HEADER /************************************************************************* * * @section: * bitmap_handling * * @title: * Bitmap Handling * * @abstract: * Handling FT_Bitmap objects. * * @description: * This section contains functions for handling @FT_Bitmap objects, * automatically adjusting the target's bitmap buffer size as needed. * * Note that none of the functions changes the bitmap's 'flow' (as * indicated by the sign of the `pitch` field in @FT_Bitmap). * * To set the flow, assign an appropriate positive or negative value to * the `pitch` field of the target @FT_Bitmap object after calling * @FT_Bitmap_Init but before calling any of the other functions * described here. / /************************************************************************* * * @function: * FT_Bitmap_Init * * @description: * Initialize a pointer to an @FT_Bitmap structure. * * @inout: * abitmap :: * A pointer to the bitmap structure. * * @note: * A deprecated name for the same function is `FT_Bitmap_New`. / FT_EXPORT( void ) FT_Bitmap_Init( FT_Bitmap abitmap ); /* deprecated / FT_EXPORT( void ) FT_Bitmap_New( FT_Bitmap abitmap ); /************************************************************************** * * @function: * FT_Bitmap_Copy * * @description: * Copy a bitmap into another one. * * @input: * library :: * A handle to a library object. * * source :: * A handle to the source bitmap. * * @output: * target :: * A handle to the target bitmap. * * @return: * FreeType error code. 0~means success. * * @note: * `source->buffer` and `target->buffer` must neither be equal nor * overlap. / FT_EXPORT( FT_Error ) FT_Bitmap_Copy( FT_Library library, const FT_Bitmap source, FT_Bitmap target ); /************************************************************************* * * @function: * FT_Bitmap_Embolden * * @description: * Embolden a bitmap. The new bitmap will be about `xStrength` pixels * wider and `yStrength` pixels higher. The left and bottom borders are * kept unchanged. * * @input: * library :: * A handle to a library object. * * xStrength :: * How strong the glyph is emboldened horizontally. Expressed in 26.6 * pixel format. * * yStrength :: * How strong the glyph is emboldened vertically. Expressed in 26.6 * pixel format. * * @inout: * bitmap :: * A handle to the target bitmap. * * @return: * FreeType error code. 0~means success. * * @note: * The current implementation restricts `xStrength` to be less than or * equal to~8 if bitmap is of pixel_mode @FT_PIXEL_MODE_MONO. * * If you want to embolden the bitmap owned by a @FT_GlyphSlotRec, you * should call @FT_GlyphSlot_Own_Bitmap on the slot first. * * Bitmaps in @FT_PIXEL_MODE_GRAY2 and @FT_PIXEL_MODE_GRAY@ format are * converted to @FT_PIXEL_MODE_GRAY format (i.e., 8bpp). / FT_EXPORT( FT_Error ) FT_Bitmap_Embolden( FT_Library library, FT_Bitmap bitmap, FT_Pos xStrength, FT_Pos yStrength ); /************************************************************************** * * @function: * FT_Bitmap_Convert * * @description: * Convert a bitmap object with depth 1bpp, 2bpp, 4bpp, 8bpp or 32bpp to * a bitmap object with depth 8bpp, making the number of used bytes per * line (a.k.a. the 'pitch') a multiple of `alignment`. * * @input: * library :: * A handle to a library object. * * source :: * The source bitmap. * * alignment :: * The pitch of the bitmap is a multiple of this argument. Common * values are 1, 2, or 4. * * @output: * target :: * The target bitmap. * * @return: * FreeType error code. 0~means success. * * @note: * It is possible to call @FT_Bitmap_Convert multiple times without * calling @FT_Bitmap_Done (the memory is simply reallocated). * * Use @FT_Bitmap_Done to finally remove the bitmap object. * * The `library` argument is taken to have access to FreeType's memory * handling functions. * * `source->buffer` and `target->buffer` must neither be equal nor * overlap. / FT_EXPORT( FT_Error ) FT_Bitmap_Convert( FT_Library library, const FT_Bitmap source, FT_Bitmap target, FT_Int alignment ); /************************************************************************* * * @function: * FT_Bitmap_Blend * * @description: * Blend a bitmap onto another bitmap, using a given color. * * @input: * library :: * A handle to a library object. * * source :: * The source bitmap, which can have any @FT_Pixel_Mode format. * * source_offset :: * The offset vector to the upper left corner of the source bitmap in * 26.6 pixel format. It should represent an integer offset; the * function will set the lowest six bits to zero to enforce that. * * color :: * The color used to draw `source` onto `target`. * * @inout: * target :: * A handle to an `FT_Bitmap` object. It should be either initialized * as empty with a call to @FT_Bitmap_Init, or it should be of type * @FT_PIXEL_MODE_BGRA. * * atarget_offset :: * The offset vector to the upper left corner of the target bitmap in * 26.6 pixel format. It should represent an integer offset; the * function will set the lowest six bits to zero to enforce that. * * @return: * FreeType error code. 0~means success. * * @note: * This function doesn't perform clipping. * * The bitmap in `target` gets allocated or reallocated as needed; the * vector `atarget_offset` is updated accordingly. * * In case of allocation or reallocation, the bitmap's pitch is set to * `4 * width`. Both `source` and `target` must have the same bitmap * flow (as indicated by the sign of the `pitch` field). * * `source->buffer` and `target->buffer` must neither be equal nor * overlap. * * @since: * 2.10 / FT_EXPORT( FT_Error ) FT_Bitmap_Blend( FT_Library library, const FT_Bitmap source, const FT_Vector source_offset, FT_Bitmap* target, FT_Vector atarget_offset, FT_Color color ); /************************************************************************* * * @function: * FT_GlyphSlot_Own_Bitmap * * @description: * Make sure that a glyph slot owns `slot->bitmap`. * * @input: * slot :: * The glyph slot. * * @return: * FreeType error code. 0~means success. * * @note: * This function is to be used in combination with @FT_Bitmap_Embolden. / FT_EXPORT( FT_Error ) FT_GlyphSlot_Own_Bitmap( FT_GlyphSlot slot ); /************************************************************************* * * @function: * FT_Bitmap_Done * * @description: * Destroy a bitmap object initialized with @FT_Bitmap_Init. * * @input: * library :: * A handle to a library object. * * bitmap :: * The bitmap object to be freed. * * @return: * FreeType error code. 0~means success. * * @note: * The `library` argument is taken to have access to FreeType's memory * handling functions. / FT_EXPORT( FT_Error ) FT_Bitmap_Done( FT_Library library, FT_Bitmap bitmap ); /* / FT_END_HEADER #endif / FTBITMAP_H_ / / END */

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