Cairo,SDL在iOS平台的编译，运行

从网上下了个blobsallad（点击打开链接）的代码，很有趣，准备移植到iOS平台上。

程序需要Cairo，SDL，首先编译这他们的iOS平台库。

SDL 1.3天然支持iOS的编译，不在话下。

编译Cairo：

Cairo又依赖libpng，pixman，下载这两个库的源代码。

模拟器编译安装 libpng pixman

./configure CC="/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc -std=c99 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/" AR="/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ar" 

一切顺利，但是不适用于Cairo的编译，于是，一遍一遍的试，关掉了N多特性后，编译成功：

./configure CC="/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc -std=gnu99 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/ -miphoneos-version-min=5.0" AR="/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ar" --enable-xlib=no --enable-xlib-xrender=no --enable-ft=no --enable-script=no --enable-ps=no --enable-pdf=no --enable-svg=no --enable-trace=no --enable-interpreter=no --enable-png=no

真机编译:

armv6:

./configure --host=arm-apple-darwin10 CC="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc -std=gnu99 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk"

./configure --host=arm-apple-darwin10 CC="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc -std=gnu99 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/" --enable-xlib=no --enable-xlib-xrender=no --enable-ft=no --enable-script=no --enable-ps=no --enable-pdf=no --enable-svg=no --enable-trace=no --enable-interpreter=no --enable-png=no

armv7:

./configure --host=arm-apple-darwin10 CC="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc -std=gnu99 -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk"

./configure --host=arm-apple-darwin10 CC="/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc -std=gnu99 -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk/" --enable-xlib=no --enable-xlib-xrender=no --enable-ft=no --enable-script=no --enable-ps=no --enable-pdf=no --enable-svg=no --enable-trace=no --enable-interpreter=no --enable-png=no

新建iOS工程。

把编译好的cairo.a,sdl.a,pixman.a拖到工程里。

添加几个framework: audiotoolbox, audiocore,  quartzcore, opengles

第一次编译代码，出错。

原因是blob用的SDL 1.2，一些API在1.3上有修改。

现学现用，根据API名字猜功能，做了些改动，可以运行，但可能方法不规范，麻烦请指正。

1.3不在支持surface的直接绘制，而是采用windows，render控制。

surface和render之间也没找到直接的联系，于是就用了texture这个间接联系。

1.在bs_cairo.c里面，创建screen，修改为：

    SDL_Window *window = SDL_CreateWindow(NULL, 0, 0, width, height,
                     SDL_WINDOW_SHOWN);
    
    pCairoSdl->pRender = SDL_CreateRenderer(window, -1, 0);
    
    if (pCairoSdl->pRender == NULL) {
        fprintf(stderr, "SDL_CreateSoftwareRenderer failed: %s\n", SDL_GetError()); 
        exit(1); 
    }
    
    pCairoSdl->pScreen = SDL_CreateRGBSurface (SDL_SWSURFACE,  width,  height, 32, 0,0,0,0);
    
  if(pCairoSdl->pScreen == NULL)
  {
    fprintf(stderr, "SDL_SetVideoMode failed: %s\n", SDL_GetError()); 
    exit(1); 
  }
    
    pCairoSdl->pTexture = SDL_CreateTextureFromSurface(pCairoSdl->pRender, pCairoSdl->pScreen);
    if(pCairoSdl->pTexture == NULL)
    {
        fprintf(stderr, "SDL_CreateTextureFromSurface failed: %s\n", SDL_GetError()); 
        exit(1); 
    }

2.bs_main绘制：

    SDL_DestroyTexture(pMainData->pCairoSdl->pTexture);
    pMainData->pCairoSdl->pTexture = SDL_CreateTextureFromSurface( pMainData->pCairoSdl->pRender, pMainData->pCairoSdl->pScreen);
    
    SDL_RenderCopy(pMainData->pCairoSdl->pRender, pMainData->pCairoSdl->pTexture, &srcRect, &dstRect);
        
    SDL_RenderPresent(pMainData->pCairoSdl->pRender);

大功告成：