Fixes memory leaks of freetype.

This commit fixes the issue that freetype library isn’t released in `fonsDeleteInternal()` and causes memory leaks.

Fixes the bug that gl may fail to draw fringes.

This commit fixes the bug that `glnvg__convexFill()` tried to draw fringes depending on whether `NVG_ANTIALIAS` is set. However, #386 adds `nvgShapeAntiAlias()` for chaning anti-alias state explicitly, and `glnvg__convexFill()` would cause error If the anti-alias state is disabled.

Fix example crash on 32bit platform

Update README.md with another project link

Forces autohint when loading glyph using FreeType.

This commit adds the `FT_LOAD_FORCE_AUTOHINT` parameter to `FT_Load_Glyph()` to fix wonky characters.

Fixes text corruption on atlas rebuild.

This commit fixes #494.

Fixes the type of view size.

This commit changes the type of the view size accepted by `nvgRenderFrame()` from `int` to `float` so it matches the type defined in `GLNVGcontext`. This would prevent a framebuffer missing a pixel in final rendering result.

- disable stroke AA gradient when not using AA

Use GLES2 glTex[Sub]Image2D code paths also for GL2

Mark devicePixelRatio unused in glnvg_renderViewport

Resets font atlas when it is full.

This commit updates font stash to render glyph's bitmap data on demand. This change is intended to fix the issue that `nvgTextBounds()` may return an unreliable result when font atlas is full. This situation usually happens when auto scaling a large font text to fit a small rectangle.

The `fons__getGlyph()` function now accepts a new parameter indicating whether bitmap data is optional, and only `nvgText()` requires it. All of `nvgTextGlyphPositions()`, `nvgTextBreakLines()`, `nvgTextBounds()` and `nvgTextBoxBounds()` functions are changed to work without glyph’s bitmap data.

Only apply fallback if GL_DEPTH24_STENCIL8 is defined

Support ~2010 Mac graphics cards (and possibly others) with nvgluCreateFramebuffer patch

for nvgluCreateFramebuffer

Fix MSVC 2017 compiler warning

Fix clang compiler warnings

Adds link of the Metal port.

I just implmeneted the native Metal port of NanoVG. ;)

Fixed return value of nvgText to be the position after the rendered
string, also fixed scaling of the value.

Allows to turn on/off antialias for shapes.

This commit adds a new `nvgShapeAntiAlias()` function for turning on/off antialias for specific shapes.

Prevents uploading unused vertices to GPU.

This commit fixes the bug that `glnvg__renderFill()` allocates unused quad vertices for `GLNVG_CONVEXFILL`, which causes unused vertices uploaded to the GPU.

Besides, the quad for the `GLNVG_FILL` type is changed to drawn by `GL_TRIANGLE_STRIP` instead of `GL_TRIANGLES` so two more vertices can be reduced per quad.

In one of my test case, I need to paste an image to a framebuffer about 5,000 times, and this change would reduce the total number of uploaded vertices from `52,106` to `22,476`. It is good for FPS and battery consumption.

Discards fragments as early as possible.

This commit moves the `discard` instruction in the fragment shader to an earlier position to avoid performing calculations whose results are unused.

Highlighted the need for render target stencil buffer.

Fixes how glext header is included.

This commit fixes the issue caused by #357 that nanovg failed to compile on iOS due to the wrong way of including glext header.

Bug fixes to compile under OS X 12.3

To make the examples link correctly under OS X 12.3, you need to include
<OpenGL/glext.h> in the file.  This commit limits what happens by protecting
the include as follows:

    #ifdef __APPLE__
    #   include <OpenGL/glext.h>
    #endif

Thus, this should have no effect on non-Apple systems.

To get nanovg to link correctly under OS X 12.3, it needs to be linked against
the Carbon libraries.  This was missing in the premake4.lua files.  Now fixed.

Improve nvgGlobalCompositeOperation with state

Add image flag to support GL_NEAREST rendering