本文整理汇总了C++中TRaster32P::extract方法的典型用法代码示例。如果您正苦于以下问题：C++ TRaster32P::extract方法的具体用法？C++ TRaster32P::extract怎么用？C++ TRaster32P::extract使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类TRaster32P的用法示例。
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示例1: clearMatte
GLuint MeshTexturizer::Imp::textureAlloc(const TRaster32P &ras, const TRaster32P &aux,
int x, int y, int textureLx, int textureLy,
bool premultiplied)
{
struct locals {
static void clearMatte(const TRaster32P &ras, int xBegin, int yBegin, int xEnd, int yEnd)
{
for (int y = yBegin; y != yEnd; ++y) {
TPixel32 *line = ras->pixels(y), *pixEnd = line + xEnd;
for (TPixel32 *pix = line + xBegin; pix != pixEnd; ++pix)
pix->m = 0;
}
}
static void clearMatte_border(const TRaster32P &ras, int border0, int border1)
{
assert(border0 < border1);
// Horizontal
clearMatte(ras, border0, border0, ras->getLx() - border0, border1);
clearMatte(ras, border0, ras->getLy() - border1, ras->getLx() - border0, ras->getLy() - border0);
// Vertical
clearMatte(ras, border0, border1, border1, ras->getLy() - border1);
clearMatte(ras, ras->getLx() - border1, border1, ras->getLx() - border0, ras->getLy() - border1);
}
}; // locals
// Prepare the texture tile
assert(aux->getLx() >= textureLx + TOTAL_BORDER_2 && aux->getLy() >= textureLy + TOTAL_BORDER_2);
TRect rasRect(x, y, x + textureLx - 1, y + textureLy - 1);
rasRect = rasRect.enlarge(premultiplied ? COPIED_BORDER : COPIED_BORDER + NONPREM_BORDER);
rasRect = rasRect * ras->getBounds();
TRect auxRect(rasRect - TPoint(x - TOTAL_BORDER, y - TOTAL_BORDER));
// An auxiliary raster must be used to supply the transparent border
TRaster32P tex(aux->extract(0, 0, textureLx + TOTAL_BORDER_2 - 1, textureLy + TOTAL_BORDER_2 - 1));
tex->clear();
aux->extract(auxRect)->copy(ras->extract(rasRect));
if (!premultiplied && NONPREM_BORDER > 0)
locals::clearMatte_border(aux, TRANSP_BORDER - NONPREM_BORDER, TRANSP_BORDER);
// Pass the raster into VRAM
GLuint texId;
glGenTextures(1, &texId);
glBindTexture(GL_TEXTURE_2D, texId);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); // These must be used on a bound texture,
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); // and are remembered in the OpenGL context.
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); // They can be set here, no need for
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); // the user to do it.
glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->getWrap());
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D,
0, // one level only
GL_RGBA, // pixel channels count
tex->getLx(), // width
tex->getLy(), // height
0, // border size
TGL_FMT, // pixel format
GL_UNSIGNED_BYTE, // pixel data type
(GLvoid *)tex->getRawData());
return texId;
}