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freetype2/[GSoC]ChangeLog

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2020-07-13 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added more properties.
Added two properties:
- `flip_y': To flip the generated SDF along the y axis.
- `flip_sign': By default outside is treated to have
negative sign, setting `flip_sign' to 1 the outside
pixels will have positive sign.
* src/sdf/ftsdf.* (*): Use the newly added properties.
* src/sdf/ftsdfrend.* (*): Add the newly added properties,
and add functionality to set them using `FT_Property_Set'.
2020-07-13 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Check for left or right fill.
* src/sdf/ftsdf.c (SDF_Params): Added struct which
contains some internal data required by the rater-
izer (such as left/right fill).
* src/sdf/ftsdf.c (sdf_raster_render): Determine the
fill side and pass it to the `sdf_generate_' funcs.
* src/sdf/ftsdf.c (sdf_generate_): Use the new `SDF_Params'
to generate SDF accordingly.
2020-07-12 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Optimize the coarse grid optimization.
* src/sdf/ftsdf.c (sdf_generate_coarse_grid): Merge
the relevant edge finding loop and shortest dist-
ance search loop. We can find the relevant edges
of a coarse grid and immediately use them to find
the shortest distance of the points in the coarse
grid. This drastically reduce memory usage and
performance.
Also, do the sign assignment of the edges which was
missing.
2020-07-11 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (*): Fixed warnings.
Fixed various warnings and other few errors.
2020-07-11 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (sdf_generate_coarse_grid): Comments.
Add more comments explaining the step by step
process of using coarse grid to increase the
performance of nearest distance search.
2020-07-11 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (sdf_generate_coarse_grid): Memory leak.
Release the allocated lists for the coarse grid after
we are done using them.
2020-07-11 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Completed the coarse grid optimization.
* src/sdf/ftsdf.c (sdf_generate_coarse_grid): Fixed
an issue with position calculation and upside down
images.
2020-07-10 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Partially completed the coarse grid optimization.
* src/sdf/ftsdf.c (sdf_generate_coarse_grid): Added
functionality to check distances of all edges from
the coarse grid and add the relevant edges to the
list.
[Note]: The function is not complete yet.
2020-07-10 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added the coarse grid optimization function.
* src/sdf/ftsdf.c (sdf_generate_coarse_grid): The
function uses coarse grid to optimize nearest edge
search performance.
2020-07-10 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Remove use of `FT_List'.
Simply use a `next' pointer inside `SDF_Edge' and
`SDF_Contour' to create a linked list. This reduces
the number of allocations due to `FT_ListNode', also
we don't need a doubly linked list.
* src/sdf/ftsdf.c (SDF_Edge, SDF_Contour): Remove the
`FT_List' and use a `next' pointer to create the
linked list.
* src/sdf/ftsdf.c(sdf_edge_destructor, sdf_contour_destructor):
Removed, not needed any more.
* src/sdf/ftsdf.c (*): Remove the use of `FT_List_'
functions wherever necessary and sync with the new
list.
2020-07-09 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added subdivision optimization.
* src/sdf/ftsdf.c (sdf_generate_subdivision): The
function generate SDF just like the `sdf_generate'
function, but subdivide the curve into a number of
lines and then use the `sdf_generate_bounding_box'
function to generate SDF.
2020-07-09 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added functions to subdivide a cubic curve.
* src/sdf/ftsdf.c (split_cubic, split_sdf_cubic):
These functions can be used to subdivide a
cubic bezier curve into line segments which can
then be used to generate the SDF.
* src/sdf/ftsdf.c (split_sdf_shape): Added function
to split a cubic into a line segments.
* src/sdf/ftsdf.c (sdf_shape_done): No need to pass
`FT_Memory' as a parameter, it can be accessed
from the `shape' struct.
2020-07-09 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (split_sdf_shape): Typo.
2020-07-08 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (split_sdf_shape): Memory leak.
After recursion the edges variable becomes `NULL'
so reassign it to deallocate the list completely.
2020-07-08 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added functions to subdivide a conic curve.
* src/sdf/ftsdf.c (split_conic, split_sdf_conic):
These functions can be used to subdivide a
conic bezier curve into line segments which can
then be used to generate the SDF.
* src/sdf/ftsdf.c (split_sdf_shape): Added function
to split a outline into a line segments.
2020-07-06 Anuj Verma <anujv@iitbhilai.ac.in>
* [GSoC]ChangLog: Fixed typos.
2020-07-06 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdfrend.c (sdf_generate_bounding_box): Due to
the way we use the bounding box, we need to keep a track
of signed distances of each pixel so later the sign can
be determined properly. The method is certainly faster
then checking all the pixels against all the edges,
but also require a decent amount of memory to work.
2020-07-06 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Precompute the orthogonality.
* src/sdf/ftsdf.c (SDF_Signed_Distance): Remove unused
fields.
* src/sdf/ftsdf.c (resolve_corner): The function can be
simplified to a single line. Instead of computing
orthogonality here, we precompute it in the corresponding
`get_min_distance_' functions more efficiently.
* src/sdf/ftsdf.c (get_min_distance_): Precompute orthogonality/
cross product of direction and the distance vector. Since
in these function we know that weather the distance vector
and the direction are perpendicular, we can simply set
the cross to 1 (sin(90) = 1) in case they are perpendicular.
This can reduce the number of `FT_Vector_NormLen' calls.
2020-07-05 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added bounding box optimization.
* src/sdf/ftsdfrend.c (sdf_generate_bounding_box): The
function generate SDF just like the `sdf_generate'
function, but uses bounding box to check pixels
efficiently.
* src/sdf/ftsdfrend.c (get_control_box): Added function
to get control box of a `SDF_Edge'.
2020-07-04 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdfrend.c (sdf_shape_dump): Use `%ld' to
printf `signed long' otherwise it gives wrong output.
2020-07-04 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdfrend.c (ft_sdf_render): Don't negate
unsigned integers.
2020-07-03 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c: Use ASCII single quote (') instead
of back tick (`) for derivatives. Looks cleaner.
2020-07-03 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added function to find shortest distance from a
point to a cubic bezier. Now the sdf module can render
all types of fonts, but still has some issues.
* src/sdf/ftsdf.c (get_min_distance_cubic): The function
calculates shortest distance from a point to a cubic
bezier curve.
* src/sdf/ftsdf.c (sdf_edge_get_min_distance): Add the
`get_min_distance_cubic' function call.
2020-07-03 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (resolve_corner): [Bug] Remove the
nearest_point check. Two distances can be same and
can give opposite sign, but they may not have a
common nearest_point. Also remove distance check
because due to precision errors the two distances can
be really really close. Therefore use epsilon instead.
* src/sdf/ftsdf.c (sdf_contour_get_min_distance): Use
epsilon for comparing distances.
2020-07-03 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (sdf_shape_dump): Add more info
to the debug output.
2020-07-03 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (MAX_NEWTON_ITERATION => MAX_NEWTON_DIVISIONS):
Renamed to avoid confusion.
2020-07-02 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added Newton's method for shortest distance
from a point to a conic.
* src/sdf/ftsdf.c (get_min_distance_conic): Created
a new function with same name which uses Newton's
iteration for finding shortest distance from a point
to a conic curve. This doesn't causes underflow.
* src/sdf/ftsdf.c (USE_NEWTON_FOR_CONIC): This macro
can be used to toggle between Newton or analytical
cubic solving method.
2020-07-01 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (get_min_distance_conic): Add more
details to why we clamp the roots.
* src/sdf/ftsdf.c: Make sure preprocessor # is always
on the first line.
2020-07-01 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Make squared distances toggleable.
* src/sdf/ftsdf.c (SDF_Signed_Distance): Renamed
squared_distance to distance. It can now represent
both squared as well as actual distances.
* src/sdf/ftsdf.c (USE_SQUARED_DISTANCES): Added macro
which control weather to do computation is squared
distances or actual distances. This can be used to
avoid overflow when generating large SDF bitmaps.
* src/sdf/ftsdf.c: Make sure not to exceed line length
of 78.
2020-07-01 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (get_min_distance_conic): In case
the cubic equation returns zero root, use endpoints
for calculating the shortest distance.
2020-07-01 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added function to find shortest distance from a
point to a conic bezier. Now the sdf module can render
ttf fonts or fonts with line and conic segments.
* src/sdf/ftsdf.c (get_min_distance_conic): The function
calculates shortest distance from a point to a conic
bezier curve.
* src/sdf/ftsdf.c (sdf_edge_get_min_distance): Add the
`get_min_distance_conic' function call.
2020-07-01 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (get_min_distance_line): First check
pointer before using or dereferencing them.
2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c: Avoid parentheses if there is only
one statement inside a control-flow statement.
2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added functions to solve polynomial equations.
* src/sdf/ftsdf.c (solve_quadratic_equation,
solve_cubic_equation): Added functions to solve
quadratic and cubic equations. These will be used for
conic bezier curves only.
2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (square_root, cube_root, arc_cos):
Use FT_16D16 instead of FT_Fixed to avoid confusion.
2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (cube_root, arc_cos): Added a few
essential math functions.
2020-06-30 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Fixed compilation under gnumake.
* src/sdf/rules.mk (DRV_OBJ_ => DRV_OBJS_): Fixed variable
name so that the sdf can compile.
* src/sdf/module.mk: Fixed spacing.
* src/sdf/*.c: Fixed all compiler warnings.
* [GSoC]ChangLog: Fixed dates.
2020-06-29 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added function to resolve corners in case of
ambiguity.
* src/sdf/ftsdf.c (resolve_corner): Added function
to determine the correct sign in case there are
two sign for the same shortest distance (happens
around corners).
* src/sdf/ftsdf.c: Typo neartest_point -> nearest_point.
2020-06-29 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] The module can now generate signed distance
fields for outline with only lines.
* src/sdf/ftsdf.c (get_min_distance_line): Calculation
mistake.
* src/sdf/ftsdf.c (square_root): Added function to calculate
square root of a 16.16 fixed point integer.
* src/sdf/ftsdf.c (sdf_generate): Assign values to the output
bitmap, currently the output is 6.10 fixed point which can
contain values from [-32, 32]. Also fixed a bug which was
causing upside down images.
* src/sdf/ftsdfrend.c (ft_sdf_render): Fixed alignment issues.
2020-06-28 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added function to find shortest distance from
a point to a line.
* src/sdf/ftsdf.c (get_min_distance_line): The function
calculate the shortest signed distance from a point
to a line segment.
* src/sdf/ftsdf.c (sdf_contour_get_min_distance): Typo.
* src/sdf/ftsdf.c (SDF_Signed_Distance): Use squared
distance instead of actual distance for performance.
2020-06-28 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (SDF_Iterator_IO): Removed.
* src/sdf/ftsdf.c (sdf_edge_iterator_func => sdf_edge_get_min_distance
sdf_contour_iterator_func => sdf_contour_get_min_distance): Renamed.
Manually iterate through the lists instead of `FT_List_Iterate' to
avoid io structs and looks a bit cleaner.
2020-06-28 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added basic outline of the functions required to
generate sdf.
* src/sdf/ftsdf.c (SDF_Signed_Distance): Added struct which
represent a complete signed distance and can be used to
get cross, dot, sign etc.
* src/sdf/ftsdf.c (SDF_Iterator_IO): This struct will be used
while `FT_List_Iterate'.
* src/sdf/ftsdf.c (sdf_generate): Added function which generate
SDF from `SDF_Shape'.
* src/sdf/ftsdf.c (sdf_edge_iterator_func,
sdf_contour_iterator_func): Added functions
which iterate through contours and edges and return the shortest
distance.
2020-06-27 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added `SDF_Raster_Params' struct which extends
`FT_Raster_Params' and has a few extra fields. This is done
to pass extra data to the sdf rasterizer which is required
while rasterizing.
* src/sdf/ftsdf.h (SDF_Raster_Params): Added a struct which
extends `FT_Raster_Params' and has the `spread' parameter.
Also moved the max, min and default spread values to this
header file.
* src/sdf/ftsdf.c (sdf_raster_render): Added parameter and
attribute checking in order to pick errors and return
early.
* src//sdf/ftsdfrend.c (ft_sdf_render): Setup the `SDF_Raster_Params'
and pass it to the rasterizer instead of `FT_Raster_Params'.
2020-06-27 Anuj Verma <anujv@iitbhilai.ac.in>
* include/freetype/ftimage.h (FT_RASTER_FLAG_): Added
a new raster flag `FT_RASTER_FLAG_SDF'. The `ftsdf'
rasterizer will only render if this flag is set.
* src/sdf/ftsdfrend.c (ft_sdf_render): Set the `flags' field
of `FT_Raster_Params' to `FT_RASTER_FLAG_SDF'.
2020-06-26 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (sdf_shape_dump): Use `FT_TRACEX'
instead of `printf'.
2020-06-26 Anuj Verma <anujv@iitbhilai.ac.in>
* src/sdf/ftsdf.c (sdf_shape_dump): Added function to
dump the `SDF_Shape' on the console for debugging.
2020-06-26 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added functions to de-allocate `SDF_' structs.
* src/sdf/ftsdf.c (SDF_Contour, SDF_Shape): Use `FT_ListRec'
instead of `FT_List' to avoid a few extra allocations.
* src/sdf/ftsdf.c (SDF_Edge, SDF_Contour, SDF_Shape): Added
functions to de-allocate these structs and their members.
* src/sdf/ftsdfrenc.c: Typo.
2020-06-25 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Decompose outline and store it in a temporary
`SDF_Shape' object for easy iteration and pre-computing
some variables.
* src/sdf/ftsdf.c (sdf_outline_decompose): Added function
to decompost outline and store it in a `SDF_Shape' object.
This allows us to pre-compute some variable.
2020-06-25 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added essential enums and structs required.
* src/freetype/internal/fttrace.h: Remove tabs.
* src/sdf/ftsdfrend.c (ft_sdf_render): Calculate padding
using the `spread'.
* src/sdf/ftsdf.c (SDF_Edge_Type, SDF_Edge, SDF_Contour,
SDF_Shape): Added structures and their initializer
functions.
2020-06-23 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added functionality to set and get module properties.
Also added a `spread' property.
* src/freetype/internal/fttrace.h: Added sdf module trace
define.
* src/sdf/ftsdf.c (sdf_TRaster => SDF_TRaster): Use capital
character for structs.
* src/sdf/ftsdfrend.h (SDF_Renderer_Module): Added a struct
which extends the `FT_RendererRec' and added the `spread'
property.
* src/sdf/ftsdfrend.c: Synchronized the code to use the new
`SDF_Renderer_Module' and added functions to get/set the
properties.
2020-06-20 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Implemented a few functions required by a renderer
module.
* src/sdf/ftsdf.c (sdf_TRaster_): Added new structure to hold
the memory allocator `FT_Memory'.
* src/sdf/ftsdf.c (ft_sdf_raster): Implemented a few essential
functions required by `FT_Raster'.
* src/sdf/ftsdfrend.c (ft_sdf_renderer_class): Implemented a few
essential functions required by `FT_Renderer'.
* src/sdf/ftsdfrend.c (ft_sdf_render): Added functionality to
compute shift and padding before rendering the outline.
2020-06-19 Anuj Verma <anujv@iitbhilai.ac.in>
* include/freetype/ftimage.h (FT_Render_Mode_): Added new
pixel mode `FT_PIXEL_MODE_GRAY16' which will be used
to represent signed values while rendering to SDF bitmap.
2020-06-19 Anuj Verma <anujv@iitbhilai.ac.in>
* include/freetype/freetype.h (FT_Render_Mode_): Added new
rendermode `FT_RENDER_MODE_SDF' which will be used by the
`sdf' module to generate signed distance fields from glyph's
outline.
* src/sdf/ftsdfrend.h, src/sdf/module.mk, src/sdf/rules.mk:
Add a new line at the end of files.
2020-06-18 Anuj Verma <anujv@iitbhilai.ac.in>
[sdf] Added the structure of a new module to render
signed distance fields.
* src/sdf/sdf.c, src/sdf/ftsdfrend.c, src/sdf/ftsdf.c,
src/sdf/ftsdfrend.h, src/sdf/ftsdf.h, src/sdf/ftsdferrs.h:
Added files required by the `sdf' renderer module and added
the basic structure and functions required.
* src/sdf/rules.mk, src/sdf/module.mk: Added files required to
build the `sdf' module using the default build system.
* CMakeLists.txt (BASE_SRCS): Add `src/sdf/sdf.c' to the variable.
* include/freetype/config/ftmodule.h: Added `sdf' module
declaration so that the module can be compiled when not compiling
with GNU make.
* modules.cfg (RASTER_MODULES): Include `sdf' module to the default
rasterizer module list.
* include/freetype/ftmoderr.h: sdf module error define
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