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正如标题所述,我使用FreeImage在我的OpenGL游戏中加载纹理,但是如何获取子图像?如何使用FreeImage获取子图像
我当前的代码如下所示:
FREE_IMAGE_FORMAT fif = FIF_UNKNOWN;
FIBITMAP* dib = nullptr;
fif = FreeImage_GetFileType(filename, 0);
if (fif == FIF_UNKNOWN)
fif = FreeImage_GetFIFFromFilename(filename);
if (fif == FIF_UNKNOWN)
return nullptr;
if (FreeImage_FIFSupportsReading(fif))
dib = FreeImage_Load(fif, filename);
if (!dib)
return nullptr;
BYTE* pixels = FreeImage_GetBits(dib);
*width = FreeImage_GetWidth(dib);
*height = FreeImage_GetHeight(dib);
*bits = FreeImage_GetBPP(dib);
int size = *width * *height * (*bits/8);
BYTE* result = new BYTE[size];
memcpy(result, pixels, size);
FreeImage_Unload(dib);
return result;
什么会,我需要改变,以获得子图像(例如像素的32×32区域的左上角)?