//=============================PluginMain Start======================
DLLExport MACPASCAL void PluginMain (const short selector,
PISelectionParams *selectionParamBlock,
long *data,short *result)
{
//显示About对话框
if (selector == selectionSelectorAbout)
{
DoAbout((AboutRecordPtr)selectionParamBlock);
}
else
{
static const FProc routineForSelector [] =
{
/* selectionSelectorAbout DoAbout, */
/* selectionSelectorExecute */DoExecute
};
Ptr globalPtr = NULL;// Pointer for global structure
GPtr globals = NULL; // actual globals
//包装selectionParamBlock到globals中，真正有用的还是globals-＞selectionParamBlock
globalPtr = AllocateGlobals ((uint32)result,
(uint32)selectionParamBlock,
selectionParamBlock-＞handleProcs,
sizeof(Globals),
data,
InitGlobals);
if (globalPtr == NULL)
{
*result = memFullErr;return;
}
globals = (GPtr)globalPtr;
//调用 DoExecute 函数
if (selector ＞ selectionSelectorAbout && selector ＜= selectionSelectorExecute)
(routineForSelector[selector-1])(globals);
else
gResult = selectionBadParameters;
if ((Handle)*data != NULL)
PIUnlockHandle((Handle)*data);
} // about selector special
}
//=============================PluginMain End=================================
//=============================DoExecute Start=================================
void DoExecute (GPtr globals)
{
//一些变量声明，省略...
//...
//
//从剪贴板中读取自己定义格式的选区信息，保存到全局变量中，我加的
//省略部分内容
gQueryForParameters = ReadScriptParams (globals);
gStuff-＞treatment = 0;//KeyToEnum(EnumToKey(gCreate,typeMyCreate),typeMyPISel);//忽略原程序的UI参数处理
//获取读取端口
gResult = ReadFromWritePort(&selectionRead, selection-＞port);
//省略部分内容
//分配内存
gResult = AllocateBuffer (kBufferSize, &sBuffer);
if (gResult != noErr) goto CleanUp;
gResult = AllocateBuffer (kBufferSize, &dBuffer);
if (gResult != noErr) goto CleanUp;
gResult = AllocateBuffer (kBufferSize, &rBuffer);
if (gResult != noErr) goto CleanUp;
sData = LockBuffer (sBuffer, false);
dData = LockBuffer (dBuffer, false);
rData = LockBuffer (rBuffer, false);
//省略部分内容
//统计要处理的通道
curChannel = composite;
while (curChannel != NULL)
{
if (DoTarget curChannel-＞target : curChannel-＞shown)
total += AccountChannel (curChannel, transparency, selection);
curChannel = curChannel-＞next;
}
//进行实际的处理工作
while (curChannel != NULL)
{
if (DoTarget curChannel-＞target : curChannel-＞shown)
{
ApplyChannel (globals, curChannel, &sDesc,
transparency, &mDesc,
selection, selectionRead, &dDesc,
&rDesc, &done, total);
if (gResult != noErr) goto CleanUp;
}
curChannel = curChannel-＞next;
}
//善后工作...
}
//=========DoExecute End===========//========ApplyChannel Start========
static void ApplyChannel (GPtr globals,
ReadChannelDesc *source,
PixelMemoryDesc *sDesc,
ReadChannelDesc *mask,
PixelMemoryDesc *mDesc,
WriteChannelDesc *dest,
ChannelReadPort destRead,
PixelMemoryDesc *dDesc,
PixelMemoryDesc *rDesc,
int32 *done,int32 total)
{
//声明变量，参数检查，省略
//内层循环中，每次读取64×64的块处理
//#define kBlockRows 64
for (row = limit.top; row ＜ limit.bottom; row += kBlockRows)
for (col = limit.left; col ＜ limit.right; col += kBlockCols)
{
//省略部分内容
gResult = ReadPixels (destRead, &scaling, &area, dDesc, &wrote);
//省略部分内容
gResult = ReadPixels (source-＞port, &scaling, &area, sDesc, &wrote);
s = (unsigned8 *) sDesc-＞data;//这里是原图象数据
d = (unsigned8 *) dDesc-＞data;//这里保存处理结果
//逐个象素处理64×64的块
for (row2 = 0; row2 ＜ kBlockRows; ++row2)
{
int y = row + row2;
for (col2 = 0; col2 ＜ kBlockCols; ++col2)
{
int x = col + col2;
int nRc = 0;
bool bFound = false;
while(nRc ＜ g_rcCount)//g_rcCount是一共要显示的区域数，通过剪贴板传递计算
{
if(PtInRect(&g_rcArr[nRc],x,y))//g_rcArr存放所有要显示的区域
{
*d = 255;//这个象素处于选区内
bFound = true;
break;
}
++nRc;
}
//if(!bFound) *d = 0;
++s;
++d;
++r;
}
}
//处理完毕一小块，写回
gResult = WritePixels (dest-＞port, &area, dDesc);
//省略部分内容
}
}
//========ApplyChannel End=====
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计算机技术与应用 → 『 C/C++编程思想 』 → VC++开发PhotoShop插件之选区
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2008/4/11 10:08:00
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VC++开发PhotoShop插件之选区