If ClipPath is a singular rectangle,
we don't need to apply this to all children nodes to adjust rle span regions.
Rather than its regular sequence,
we can adjust render region as merging viewport that is introduced internally,
All in all,
If a Paint has a single ClipPath that is Rectangle,
it sets viewport with Rectangle area that viewport is applied to
raster engine to cut off the rendering boundary.
In the normal case it brings trivial effects.
but when use SVGs which has a viewbox, it could increase the performance
up to 10% (profiled with 200 svgs rendering at the same time)
Note that, this won't be applied if the Paint has affine or rotation transform.
@Issues: 294
Introduced the reference counting for the backend engines so that
tvg prevents unpaired engine initialization/termination calls by user mistake.
@Issues: 296
A duplicated picture needs to access internal picture loader data
to get its properties while rasterizing.
But it missed the loader since it's not copied from origin.
Thus, we fix this by sharing the internal loader among the duplications and origin.
@Examples: Duplicate
Description:
Fixed appendArc API for -90 angles. In that case it was drawn in wrong
direction.
@Examples
```cpp
float x = 40.0, y = 40.0;
auto shape1 = tvg::Shape::gen();
//OK
shape1->appendArc(x + 50, y, 25, 0, -91, false);
//NOK
shape1->appendArc(x + 100, y, 25, 0, -90, false);
//OK
shape1->appendArc(x + 150, y, 25, 0, -89, false);
```
This reverts commit 74b27c74af.
This patch breaks Stroke example. 1 line drawings...
There is a possibility that less 1 (i.e: 0.5) width axis-aligned line drawings...
So logically "&&" is correct.
The alpha value calculation pulled out outside the inner loop
to reduce the number of unnecessary operations.
Added local variables to reduce the number of costly
multiplications performed in a loop.
There transformation logic was not identical between shape & gradient
gradient transform was applied into center of gradient world,
while shape wasn't. So... we correct gradient transform metric to shape like.
@Issues: 255
Scene could avoid composition if its children is only child (non scene)
This patch bring it conditionally check so as to avoid unnecesary expensive job.
@Issues: 254
Description:
Crash was observed in examples when composite object was used.
It was caused because __m256i object was used on non aligned
memory to 32bit. Algorithm in this function was changed to use
unaligned __m256i_u object. Code was also simplified.
If a scene has another scene as a child and
the number of children is 1, the composition of the child does not work.
Therefore, fix that composition works as long as the number of children is not 0.
* sw_engine: adding a gradient as a stroke feature
Similarly as a shape may have a gradient fill so can the stroke.
* Capi: adding APIs for a gradient stroke
Co-authored-by: Hermet Park <hermetpark@gmail.com>
The rotation part of the transformation matrix can be assigned,
it does not have to be multiplied by the identity matrix.
The values of e13 and e23 of the transformation matrix represents the translation,
so they don't need to be taken into account in the rotation part.
