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* [sdf -> bsdf] Added a basic overview of the `bsdf' rasterizer.anuj-distance-fieldAnuj Verma2020-08-152-0/+103
| | | | | * src/sdf/ftbsdf.c: Added the citation of the original paper and added a overview of the process for generating SDF from bitmaps.
* [sdf] Remove a unicode character.Anuj Verma2020-08-151-1/+1
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* [sdf] Added a basic overview of the `sdf' rasterizer.Anuj Verma2020-08-152-2/+109
| | | | | | | | * src/sdf/ftsdf.c: Added the citation of the original paper and added a overview of the process for generating SDF from outlines. * src/sdf/ftsdf.c (sdf_generate_subdivision): Added comment explaining how the optimization works.
* [sdf] Fix gcc compiler warnings.Anuj Verma2020-08-143-21/+28
| | | | | * src/sdf/ftsdf.c, src/sdf/ftbsdf.c (*): Fix various compiler warnings, which were caused mainly due to unused variables and unused functions.
* [sdf] Bug fix.Anuj Verma2020-08-132-2/+10
| | | | | * src/sdf/ftsdf.c (sdf_generate_with_overlaps): The outside sign will always be 1. And added a missing `else'.
* [base] Fix memory leaks due to FreeType internals.Anuj Verma2020-08-122-2/+11
| | | | | | | * src/base/ftobjs.c (ft_remove_renderer): Similar to `ft_add_renderer', remover raster's `glyph_format' check. Due to this the rasterizers which do not have `glyph_format' of `FT_GLYPH_FORMAT_OUTLINE' won't get deallocated (the `raster_done' function is no called).
* [sdf] Fix memory leaks.Anuj Verma2020-08-122-19/+66
| | | | | | * src/sdf/ftsdf.c (sdf_generate_with_overlaps): Deallocate the temporary bitmaps, and all the rest of the arrays. And also handle the `shape' appropriately so as to not cause memory leaks.
* [sdf] Handle Post-Script fonts for overlap.Anuj Verma2020-08-122-3/+35
| | | | | | | | * src/sdf/ftsdf.c (sdf_generate_with_overlaps): Handle Handle Post-Script fonts for overlap support. Simply flip the orientation while combining all the separate SDF. Also, handle the `flip_sign' property separately so as to avoid handling extra cases.
* [sdf] Added overlap support (currently only for TrueType).Anuj Verma2020-08-125-46/+266
| | | | | | | | | | | | | | | | | | | | | | | | | * src/sdf/ftsdfrend.h (SDF_Renderer_Module): Removed the expermental `optimization' property. Added another property `overlaps', which can be used to turn on the overlap support. * src/sdf/ftsdf.h (SDF_Raster_Params): Ditto as above. * src/sdf/ftsdfrend.c (*): Added functionality to set and get the new `overlaps' property. * src/sdf/ftsdf.c (sdf_raster_render): Removed support for all the optimization modes and only keep the subdivision optimization and the new overlap support function. * src/sdf/ftsdf.c (sdf_generate_coarse_grid): Turned off until we can find a way to make it faster. * src/sdf/ftsdf.c (sdf_generate_with_overlaps): Added a function to generate SDF for shapes with overlapping contours. It basically generate SDF for separate contours in seperate bitmaps and then combine them to remove overlaps.
* [sdf, bsdf] Added better documentation.Anuj Verma2020-08-073-56/+292
| | | | * src/sdf/ftsdf.c, src/sdf/ftbsdf.c (*): Added documentation of the structs and enums for both the renderers.
* [sdf] Added function to get contour orientation.Anuj Verma2020-08-063-3/+85
| | | | | | | | | | * src/sdf/ftsdf.c (SDF_Contour_Orientation): Added enum to hold the different orientations of a contour. * src/sdf/ftsdf.c (get_contour_orientation): Added function which can be used to compute the orientation of a contour. * src/sdf/ftbsdf.c (*): Remove completed `[TODO]'s.
* [sdf -> bsdf] Added documentation for functions of the `bsdf' renderer.Anuj Verma2020-08-062-28/+136
| | | | * src/sdf/ftbsdf.c (*) Added function documentation for function of the `bsdf' renderer.
* [sdf] Added documentation for function of the `sdf' renderer.Anuj Verma2020-08-062-42/+194
| | | | | * src/sdf/ftsdf.c (*): Added function documentation for function of the `sdf' renderer, and fixed grammar at a few places.
* [sdf] Added documentation for some structs.Anuj Verma2020-08-055-6/+65
| | | | | | | * src/sdf/ftsdfrend.h .../ftsdfrend.c .../ftsdfcommon.h .../ftsdf.h : Added documentation for a few structs.
* [sdf -> bsdf] Extended to work with monochrome bitmaps.Anuj Verma2020-08-052-8/+54
| | | | | | * src/sdf/ftbsdf.c (bsdf_init_distance_map): Handle monochrome bitmaps and convert them to the internal intermediate format, which can then be used to generate SDF.
* * src/sdf/ftsdfrend.c (ft_bsdf_render): Initialize variable.Anuj Verma2020-08-032-1/+10
| | | | Initialize the target bitmap so as to avoid crashes due to uninitialized memory.
* [sdf -> bsdf] Fixed memory leak.Anuj Verma2020-08-032-0/+16
| | | | | | * src/sdf/ftbsdf.c (bsdf_raster_render): Release the allocated distance map. Also, added a log of total memory allocated for generating SDF from bitmap.
* [sdf -> bsdf] Fixed a bug with `finalize_sdf'.Anuj Verma2020-08-022-6/+26
| | | | | | | | * src/sdf/ftbsdf.c (finalize_sdf): First check if the value is withing [-spread, spread] and then cast it to 6.10 short, otherwise the value can overflow and give negative result. Also, flip the sign if the property `flip_sign' is set to true.
* [sdf -> bsdf] Added option to use squared distances.Anuj Verma2020-08-024-29/+59
| | | | | | | | | | | | | | | | | | | | * src/sdf/ftbsdf.c (bsdf_is_edge): Modified the function to use distance map rather than the alpha values from the source image. * src/sdf/ftbsdf.c (bsdf_approximate_edge): Only calculate approximate edges for edge pixels. Use `bsdf_is_edge' is to check for edge pixels. For non edge pixel assgn far away distances. * src/sdf/ftbsdf.c (finalize_sdf): Handle distances in case of squared distances. And also use the macro `VECTOR_LENGTH_16D16' in the entire code to compute vector length. This takes care of squared distances. * src/sdf/ftsdfcommon.c (VECTOR_LENGTH_16D16): Move the macro `VECTOR_LENGTH_16D16' from `ftsdf.c' to this file because it is also used by the `bsdf' renderer.
* * src/sdf/ftbsdf.c (compare_neighbor): Fix bug.Anuj Verma2020-08-022-6/+8
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* Fix line endings and typo.Anuj Verma2020-08-022-5/+5
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* [sdf -> bsdf] Optimized a bit.Anuj Verma2020-08-022-61/+83
| | | | | | | | | | | | | | | | | | | | | | | | * src/sdf/ftbsdf.c (ED: sign => alpha): Renamed sign to alphs. This is used to store the alpha of the current pixel mapped to the source image. This let's us store additional information without increasing memory usage. * src/sdf/ftbsdf.c (bsdf_init_distance_map): Removed any/all kind of edge approximation and edge check from the function. The function simply copy the source bitmap to the distance map now, preserving alpha values. * src/sdf/ftbsdf.c (compute_edge_distance): Use the new `alpha' parameter to compute gradient and approximate distance. Previously we were using the `dist' variable to store alpha values, which restricts modifying the `dist' variable because we need alpha values of neighbor to compute the gradient. * src/sdf/ftbsdf.c (bsdf_approximate_edge): Now that we can modify the `dist' variable of the distance map, we can combine the two nested loops. * src/sdf/ftbsdf.c (finalize_sdf): Move the `sign' determination and assignment to this function.
* * src/sdf/ftbsdf.c (compute_edge_distance): Grammer fix.Anuj Verma2020-08-022-2/+7
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* [sdf -> bsdf] Add explanation of the approximation.Anuj Verma2020-08-022-13/+72
| | | | | | | | | * src/sdf/ftbsdf.c (compute_gradient => compute_edge_distance): Renamed to make sense of what the function does. Also, added the explanation of the algorithm used and a high level view of how it works. * src/sdf/ftbsdf.c (compare_neighbor): Fix a bug related to value approximation before calling `FT_Vector_Length'.
* * src/sdf/ftsdfcommon.h (*): Fix line endings.Anuj Verma2020-08-022-122/+128
| | | Always use LF line endings.
* [sdf,bsdf] Put common propertied and functions in one file.Anuj Verma2020-08-026-100/+142
| | | | | | | | | | | * src/sdf/ftsdfcommon.h: Added new file which contains common function, macros, properties for both `sdf' and `bsdf' renderer. * src/sdf/ftsdf.c, src/sdf/ftsdf.h, src/sdf/ftbsdf.c: Remove common properties and include `ftsdfcommon.h'. * src/sdf/rules.mk (SDF_DRV_H): Add the new `ftsdfcommon.h' file to include list.
* * src/sdf/ftbsdf.c (compute_gradient): Use root(2) for the filter.Anuj Verma2020-08-022-15/+67
| | | | | Also, use the computed gradient to approximate the edge distance from a pixel's position according to the Gustavson's algorithm.
* [sdf -> bsdf] Added function to approximate edge distance.Anuj Verma2020-08-022-21/+150
| | | | | | | | | * src/sdf/ftbsdf.c (bsdf_approximate_edge): The function uses the Gustavson's algorithm to approximate the edge from pixel values. * src/sdf/ftbsdf.c (compute_gradient): The function uses Sobel's operator to compute the gradient at a pixel. The is used to detect edge direction.
* * src/sdf/ftbsdf.c (_pass): Use function for repetitive task.Anuj Verma2020-08-022-167/+75
| | | | | | | | | Use function `compare_neighbor' for comparing the neighbors. Makes it easier to tweak the algorithm and looks better. * src/sdf/ftbsdf.c (compare_neighbor): Added function to compare the neighbors and assign values if the new distance is the shortest.
* * src/sdf/ftbsdf.c (bsdf_is_edge): Use macros to make it look cleaner.Anuj Verma2020-08-022-80/+38
| | | | | Use `CHECK_NEIGHBOR' macro to check neighbors while finding edges. Make the code more readable and look cleaner.
* [sdf -> bsdf] Fix edge detection bug.Anuj Verma2020-08-022-3/+58
| | | | | * src/sdf/ftbsdf.c (bsdf_is_edge): [BUG] Check all neighbors including the diagonal neighbors to properly determine the edge.
* [sdf -> bsdf] Added edge detection algorithm.Anuj Verma2020-08-022-3/+106
| | | | | | | | | Added edge detection algorithm. It works by checking the neighboring pixels and if any neighbor is not filled (i.e. belongs to background) we mark the pixel as edge by setting it's distance to 0. * src/sdf/ftbsdf.c (bsdf_is_edge): Added function to detect if the pixel is an edge.
* [sdf -> bsdf] Added the second pass of the '8SED'.Anuj Verma2020-08-022-2/+164
| | | | | | | | | Added the second pass of the 8SED algorithm. The second pass transverse the bitmap from bottom to top and for each row it sweeps forward and backward assigning distances to the grid points. * src/sdf/ftbsdf.c (second_pas): Added function to do the second pass of the 8SED algorithm on the bitmap.
* [sdf -> bsdf] Optimize the first pass of the 8SED.Anuj Verma2020-08-022-33/+77
| | | | | | | | | * src/sdf/ftbsdf.c (first_pass): Optimize the first pass by first approximating the neighbor's distance by adding an offset. The offset will be max root(2) because the maximum be add to a vector is (1, 1). By approximating we can reduce the number of `FT_Vector_Length' calls and thus make the process faster.
* [sdf] Fix GNU Make build.Anuj Verma2020-08-023-1/+12
| | | | | | * src/sdf/rules.mk (SDF_DRV_H): Manually add source files as there is a `ftbsdf.c' file without any `ftbsdf.h'. * src/sdf/ftbsdf.c: Include `fttrigon.h' for `multi' builds.
* [sdf -> bsdf] Added first pass of the '8SED' algorithm.Anuj Verma2020-08-023-14/+284
| | | | | | | | | | | | | | | | | | | | | Added the first pass of the 8SED algorithm. The first pass transverse the bitmap from top to bottom and for each row it sweeps forward and backward assigning distances to the grid points. * src/sdf/ftbsdf.c (ED): Added additional parameter `sign'. * src/sdf/ftbsdf.c (edt8): Added function to convert bitmap to SDF using the 8SED algorithm. * src/sdf/ftbsdf.c (first_pass): Added function to do the first pass of the 8SED algorithm on the bitmap. * src/sdf/ftbsdf.c (finalize_sdf): Added function to assign the final SDF data to the target bitmap. * src/sdf/ftbsdf.c (*): Various minor or experimental changes. * src/sdf/ftsdfrend.c (ft_bsdf_render): Fix spacing.
* * src/sdf/ftbsdf.c (*): Rename `SDF_TRaster' => `BSDF_TRaster'.Anuj Verma2020-08-022-3/+9
| | | `SDF_TRaster' is for the `sdf' renderer.
* * src/sdf/ftbsdf.c: Typo. `FT_16D16' is 16.16 representation.Anuj Verma2020-08-022-1/+5
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* [sdf -> bsdf renderer] Hold a refrence to `FT_Memory'.Anuj Verma2020-08-023-44/+141
| | | | | | | | | | | | | | | | | | | | | | | Due to the way the 8SED algorithm works we need to keep a track of distances and nearest point of all the pixels/ grid points. * src/sdf/ftbsdf.c (BSDF_TRaster): Added struct to hold the `FT_Memory' reference, to be used to allocate memory. * src/sdf/ftbsdf.c (ED, BSDF_Worker): Added few more essential struct. `ED' contains infomation about the nearest point. `BSDF_Worker' is used to combine all the essentail parameters to functions. * src/sdf/ftbsdf.c (bsdf_copy_source_to_target => bsdf_init_distance_map): Renamed. * src/sdf/ftbsdf.c (*): Various minor changes. * src/sdf/sdf.c: Change the order of source include because `ftsdf.c' change some internal freetype defines which are required in `ftbsdf.c'.
* [sdf -> bsdf renderer] Convert 8bit bitmap to 16bit.Anuj Verma2020-08-022-6/+89
| | | | | | | | | * src/sdf/ftbsdf.c (bsdf_copy_source_to_target): Added extra parameter to flip the bitmap vertically. * src/sdf/ftbsdf.c (bsdf_copy_source_to_target): Implemented functionality to convert 8bits per pixel bitmap to a 16bits per pixel bitmap, which will be used to generate SDF.
* [sdf] Started the `bsdf' rasterier.Anuj Verma2020-08-022-76/+253
| | | | | | | | * src/sdf/ftbsdf.c (*): Fix line endings. * src/sdf/ftbsdf.c (bsdf_copy_source_to_target): Added function to copy the source bitmap to the center of the target bitmap and also convert it to normalized 16 bits per pixel bitmap.
* [sdf] Added interface functions for `bsdf' converter.Anuj Verma2020-08-028-8/+218
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * src/base/ftobjs.c (FT_Render_Glyph_Internal): Remove the bitmap check which prevent calling renderers if the glyph is already a bitmap. The `bsdf' renderer requires a bitmap for conversion. * src/base/ftobjs.c (ft_add_renderer): Remove the glyph format check which ensures that the glyph format for a renderer is `FT_GLYPH_FORMAT_OUTLINE', again the `bsdf' renderer has `FT_GLYPH_FORMAT_BITMAP' as a glyph format, so we need to remove the condition to initialize the renderer properly. * src/sdf/ftbsdf.c (*): Added a rasterizer for the `bsdf' renderer and created necessary functions. * src/sdf/ftbsdf.h: Add forward declaration of the rasterizer. * src/sdf/ftsdfrend.c (ft_bitmap_sdf_renderer_class): Define the new `bsdf' rendere and add the `FT_Renderer_RenderFunc' function, the rest is same as the `sdf' renderer. * src/sdf/ftsdfrend.h: Add forward declaration of the renderer. * src/sdf/rules.mk (SDF_DRV_SRC): Add the new `ftbsdf.c' file to the compile list. * src/sdf/sdf.c: Inclue the `ftbsdf.c' file if making single object.
* [sdf] Add alloc/free functions.Anuj Verma2020-08-022-40/+82
| | | | | | | | | | | | * src/sdf/ftsdf.c (*): Add `sdf_alloc' and `sdf_free' to allocate and deallocate memory respectively. By using function we can directly use them in the conditional statements, which is not possible when using `do {} while ( 0 )'. * src/sdf/ftsdf.c (SDF_MEMORY_TRACKER_): When not debugging don't leave the macros empty otherwise some compiler may emit warning because of empty `;' semi-colon.
* [sdf] Added new renderer `bsdf'.Anuj Verma2020-08-025-0/+92
| | | | | | | | | | | | | | * src/sdf/ftsdfrend.* (*): Added new renderer named `bsdf' which basically convert bitmap to signed distance fields. This is a part of the `sdf' module and not a separate module on it's own. * src/sdf/module.mk (FTMODULE_H_COMMANDS): Add the new renderer to the list of modules. * include/freetype/config/ftmodule.h: Add the new renderer to default list of modules when not compiling with GNU Make.
* [sdf] Only track memory in debug mode.Anuj Verma2020-08-022-10/+41
| | | | | * src/sdf/ftsdf.c (*): Disable total memory usage tracking if the program is not in debug mode.
* [sdfb] Removed Module.Anuj Verma2020-08-024-2/+52
| | | | | Remove sdfb module. Instead of a new module simply create a new renderer in the `sdf' module for converting bitmaps to SDF.
* Revert "[sdfb] Added new module to generate SDF from bitmap."Anuj Verma2020-08-0214-231/+0
| | | | This reverts commit 2136eddbccfa59b7478d87fe0947b35ca6a157f8.
* Revert "[sdfb] Fix GNU Make build."Anuj Verma2020-08-024-17/+4
| | | | This reverts commit 0d9179f4e8cdb02986f5d01f178364e3f2b8dc07.
* [sdfb] Fix GNU Make build.Anuj Verma2020-08-024-4/+17
| | | | | | | | | | | * src/sdfb/rules.mk (SDFB_DRV_H): Fix name of the module specific error file `ftsdfberrs.h'. * src/sdf/ftsdf.h (Optimizations): Fix warning. `warning: comma at end of enumerator list [-Wpedantic]' * src/sdf/ftsdf.c (sdf_generate_coarse_grid): Remove unused variable `cindex', causes warning. `warning: unused variable 'cindex' [-Wunused-variable]'
* [sdfb] Added new module to generate SDF from bitmap.Anuj Verma2020-08-0214-0/+231
| | | | | | | | | | | | | | | | | | | | | | | | * src/sdfb/sdfb.c, src/sdfb/ftsdfbrend.c, src/sdfb/ftsdfb.c, src/sdfb/ftsdfbrend.h, src/sdfb/ftsdfb.h, src/sdfb/ftsdfberrs.h: Added files required by the `sdfb' renderer module. * src/sdfb/rules.mk, src/sdfb/module.mk: Added files required to build the `sdfb' module using the default build system. * CMakeLists.txt (BASE_SRCS): Add `src/sdfb/sdfb.c' to the variable. * include/freetype/config/ftmodule.h: Added `sdfb' module declaration so that the module can be compiled when not compiling with GNU make. * modules.cfg (RASTER_MODULES): Include `sdfb' module to the default rasterizer module list. * include/freetype/ftmoderr.h: sdfb module error define * src/sdf/rules.mk: Add EOF.
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