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Diffstat (limited to 'src/dense/ftdense.h')
| -rw-r--r-- | src/dense/ftdense.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/src/dense/ftdense.h b/src/dense/ftdense.h index 9321aa3db..bf208d146 100644 --- a/src/dense/ftdense.h +++ b/src/dense/ftdense.h @@ -2,6 +2,148 @@ #ifndef FTDENSE_H_ #define FTDENSE_H_ + +#include <ft2build.h> +#include FT_CONFIG_CONFIG_H +#include <freetype/ftimage.h> + + +FT_BEGIN_HEADER + +/************************************************************************** + * + * @struct: + * SDF_Raster_Params + * + * @description: + * This struct must be passed to the raster render function + * @FT_Raster_RenderFunc instead of @FT_Raster_Params because the + * rasterizer requires some additional information to render properly. + * + * @fields: + * root :: + * The native raster parameters structure. + * + * spread :: + * This is an essential parameter/property required by the renderer. + * `spread` defines the maximum unsigned value that is present in the + * final SDF output. For the default value check file + * `ftsdfcommon.h`. + * + * flip_sign :: + * By default positive values indicate positions inside of contours, + * i.e., filled by a contour. If this property is true then that + * output will be the opposite of the default, i.e., negative values + * indicate positions inside of contours. + * + * flip_y :: + * Setting this parameter to true maked the output image flipped + * along the y-axis. + * + * overlaps :: + * Set this to true to generate SDF for glyphs having overlapping + * contours. The overlapping support is limited to glyphs that do not + * have self-intersecting contours. Also, removing overlaps require a + * considerable amount of extra memory; additionally, it will not work + * if generating SDF from bitmap. + * + * @note: + * All properties are valid for both the 'sdf' and 'bsdf' renderers; the + * exception is `overlaps`, which gets ignored by the 'bsdf' renderer. + * + */ +typedef struct DENSE_Raster_Params_ +{ + FT_Raster_Params root; + FT_UInt spread; + FT_Bool flip_sign; + FT_Bool flip_y; + FT_Bool overlaps; + +} DENSE_Raster_Params; + +/* rasterizer to convert outline to SDF */ +FT_EXPORT_VAR( const FT_Raster_Funcs ) ft_dense_raster; + +/** +RASTER_FP + +A floating-point anti-aliasing renderer. +Graham Asher, August 2016. + +Most of this code is derived from Raph Levien's font-rs code in the Rust +language, which is licensed under the Apache License, version 2.0. + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. +*/ + +#ifdef __cplusplus +extern "C" +{ +#endif + + typedef struct + { + float m_x; + float m_y; + } RasterFP_Point; + + typedef struct + { + /** The array used to store signed area differences. */ + float* m_a; + /** The number of elements in m_a. */ + int m_a_size; + /** The width of the current raster in pixels. */ + int m_w; + /** The height of the current raster in pixels. */ + int m_h; + /** The x origin of the raster. */ + int m_origin_x; + /** The y origin of the raster. */ + int m_origin_y; + + RasterFP_Point last_point; + } RasterFP; + + void RasterFP_Create( RasterFP* aRasterFP ); + void RasterFP_StartRasterizing( RasterFP* aRasterFP, + int aOriginX, + int aOriginY, + int aWidth, + int aHeight ); + void RasterFP_Destroy( RasterFP* aRasterFP ); + void RasterFP_DrawLine( RasterFP* aRasterFP, + RasterFP_Point aP0, + RasterFP_Point aP1 ); + void RasterFP_DrawQuadratic( RasterFP* aRasterFP, + RasterFP_Point aP0, + RasterFP_Point aP1, + RasterFP_Point aP2 ); + void RasterFP_DrawCubic( RasterFP* aRasterFP, + RasterFP_Point aP0, + RasterFP_Point aP1, + RasterFP_Point aP2, + RasterFP_Point aP3 ); + void RasterFP_GetBitmap( RasterFP* aRasterFP, unsigned char* aBitmap ); + +#ifdef __cplusplus +} // extern "C" +#endif + + +FT_END_HEADER + #endif /* FTDENSE_H_ */ /* END */ |