PPAPI Plugin在Windows下是DLL,能够嵌入图片文件。使用Skia画图时须要依据DLL里的图片文件生成SkBitmap对象。
以下是代码:
#include "utils.h"
#include "SkStream.h"
#include "SkImageDecoder.h"
#include <tchar.h>
SkBitmap* loadImageFromResource(UINT resId, LPCTSTR lpType)
{
TCHAR szLog[512] = { 0 };
HMODULE hModule = NULL;
if (FALSE == GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
, (LPCTSTR)loadImageFromResource, &hModule))
{
_stprintf_s(szLog, 512, _T("GetModuleHandleEx failed, error - %d\r\n"), GetLastError());
OutputDebugString(szLog);
return NULL;
}
HRSRC hRsrc = FindResource(hModule, MAKEINTRESOURCE(resId), lpType);
if (hRsrc == NULL)
{
_stprintf_s(szLog, 512, _T("FindResource failed, error - %d\r\n"), GetLastError());
OutputDebugString(szLog);
return NULL;
}
HGLOBAL hImgData = LoadResource(hModule, hRsrc);
if (hImgData == NULL)
{
_stprintf_s(szLog, 512, _T("LoadResource failed, error - %d\r\n"), GetLastError());
OutputDebugString(szLog);
return NULL;
}
LPVOID lpData = LockResource(hImgData);
if (lpData == NULL)
{
_stprintf_s(szLog, 512, _T("LockResource failed, error - %d\r\n"), GetLastError());
OutputDebugString(szLog);
return NULL;
}
DWORD dwSize = SizeofResource(hModule, hRsrc);
SkMemoryStream memoryStream(lpData, dwSize);
SkImageDecoder *decoder = SkImageDecoder::Factory(&memoryStream);
if (!decoder)
{
OutputDebugString(_T("SkImageDecoder::Factory failed\r\n"));
FreeResource(hImgData);
return NULL;
}
SkBitmap *bitmap = new SkBitmap();
if (SkImageDecoder::kSuccess == decoder->decode(&memoryStream,
bitmap, kBGRA_8888_SkColorType,
SkImageDecoder::kDecodePixels_Mode))
{
FreeResource(hImgData);
return bitmap;
}
//error
OutputDebugString(_T("SkImageDecoder::decode failed\r\n"));
FreeResource(hImgData);
delete bitmap;
return NULL;
}
使用很easy:
SkBitmap *bitmap = loadImageFromResource(IDB_CLEAR, _T("PNG"));
注意我加入的是png文件。rc文件内有相似这种语句:
IDB_CLEAR PNG "images\\icon-clear.png"
当中第二列是资源类型。调用loadImageFromResource时指定的类型与这里一致就可以。
其它參考文章: