Skia的资料还是比较难找到的。
Jserv 大牛的文章，http://blog.linux.org.tw/~jserv/archives/002095.html，相当难得，里面还有一个蛮不错的例子可供参考。但令人感到遗憾的是，将这份代码抄回来，并按照文中介绍的编译命令编译，没能成功。不知是因为系统环境不同，还是有其他原因。
因而尝试着对原代码及编译命令做一些小小的改动，如以下红色部分。
/* Simple vector graphics demo utilizing Skia toolkit.
* Authored by Jim Huang
*/
#include "SkBitmap.h"
#include "SkDevice.h"
#include "SkPaint.h"
#include "SkRect.h"
#include "SkImageEncoder.h"
int main()
{
// Declare a raster bitmap, which has an integer width and height,
// and a format (config), and a pointer to the actual pixels.
// Bitmaps can be drawn into a SkCanvas, but they are also used to
// specify the target of a SkCanvas' drawing operations.
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, 200, 200);
bitmap.allocPixels();
// A Canvas encapsulates all of the state about drawing into a
// device (bitmap). This includes a reference to the device itself,
// and a stack of matrix/clip values. For any given draw call (e.g.
// drawRect), the geometry of the object being drawn is transformed
// by the concatenation of all the matrices in the stack. The
// transformed geometry is clipped by the intersection of all of the
// clips in the stack.
SkCanvas canvas(bitmap);
// SkPaint class holds the style and color information about how to
// draw geometries, text and bitmaps.
SkPaint paint;
// SkIRect holds four 32 bit integer coordinates for a rectangle.
SkRect r;
paint.setARGB(255, 255, 0, 0);
r.set(25, 25, 145, 145);
canvas.drawRect(r, paint); /** Draw the specified rectangle using
the specified paint. The rectangle
will be filled or stroked based on
the Style in the paint. */
paint.setARGB(255, 0, 255, 0);
r.offset(20, 20);
canvas.drawRect(r, paint);
paint.setARGB(255, 0, 0, 255);
r.offset(20, 20);
canvas.drawRect(r, paint);
// SkImageEncoder is the base class for encoding compressed images
// from a specific SkBitmap.
SkImageEncoder::EncodeFile("snapshot.png", bitmap,
SkImageEncoder::kPNG_Type,
/* Quality ranges from 0..100 */ 100);
return 0;
}
编译test代码：
g++ \
-I./include \
-I./include/core \
-I./include/images \
-I./include/config \
-Wall -o test-skia test-skia.c \
out/src/images/SkImageDecoder_libpng.o out/libskia.a \
-lpng -lpthread -lfreetype -g