skia

Skia is an open-source 2D graphics library developed by Google. It provides a comprehensive set of drawing primitives, effects, and transformations, serving as the graphics engine for Google Chrome, Chrome OS, Android, Flutter, and many other projects. Skia is designed to be cross-platform, efficient, and highly optimized for both desktop and mobile devices.

Pros

• Cross-platform compatibility (Windows, macOS, Linux, iOS, Android)
• High performance and optimized rendering
• Extensive set of drawing primitives and effects
• Active development and support from Google

Cons

• Steep learning curve for beginners
• Limited documentation compared to some other graphics libraries
• Complex build system and dependencies
• Frequent API changes in development versions

Code Examples

1. Drawing a simple shape:

#include "include/core/SkCanvas.h"
#include "include/core/SkPaint.h"

void drawCircle(SkCanvas* canvas) {
    SkPaint paint;
    paint.setColor(SK_ColorBLUE);
    paint.setAntiAlias(true);
    canvas->drawCircle(100, 100, 50, paint);
}

2. Applying a gradient:

#include "include/effects/SkGradientShader.h"

void drawGradient(SkCanvas* canvas) {
    SkPoint points[2] = {{0, 0}, {256, 256}};
    SkColor colors[2] = {SK_ColorRED, SK_ColorBLUE};
    
    SkPaint paint;
    paint.setShader(SkGradientShader::MakeLinear(
        points, colors, nullptr, 2, SkTileMode::kClamp));
    
    canvas->drawRect(SkRect::MakeWH(256, 256), paint);
}

3. Adding text:

#include "include/core/SkFont.h"
#include "include/core/SkTextBlob.h"

void drawText(SkCanvas* canvas) {
    SkFont font;
    font.setSize(32);
    
    auto textBlob = SkTextBlob::MakeFromString("Hello, Skia!", font);
    canvas->drawTextBlob(textBlob.get(), 50, 100, SkPaint());
}

Getting Started

To get started with Skia:

1. Clone the repository:

   git clone https://skia.googlesource.com/skia.git
   

2. Install dependencies (varies by platform, see Skia documentation)

3. Build Skia:

   cd skia
   python tools/git-sync-deps
   bin/gn gen out/Release --args='is_official_build=true'
   ninja -C out/Release
   

4. Include Skia in your project and start using its APIs:

   #include "include/core/SkCanvas.h"
   #include "include/core/SkSurface.h"
   
   // Create a surface and get its canvas
   auto surface = SkSurface::MakeRasterN32Premul(640, 480);
   auto canvas = surface->getCanvas();
   
   // Draw on the canvas using Skia APIs
   // ...
   

For more detailed instructions and API documentation, refer to the official Skia documentation.