Method TextureResizeShader

Source/DX9VideoProcessor.cpp:2858–2942

}

HRESULT CDX9VideoProcessor::TextureResizeShader(
	IDirect3DTexture9* pTexture, const CRect& srcRect, const CRect& dstRect,
	IDirect3DPixelShader9* pShader, const int iRotation, const bool bFlip)
{
	HRESULT hr = S_OK;

	D3DSURFACE_DESC desc;
	if (!pTexture || FAILED(pTexture->GetLevelDesc(0, &desc))) {
		return E_FAIL;
	}

	const float dx = 1.0f / desc.Width;
	const float dy = 1.0f / desc.Height;

	float scale_x = (float)srcRect.Width();
	float scale_y = (float)srcRect.Height();
	if (iRotation == 90 || iRotation == 270) {
		scale_x /= dstRect.Height();
		scale_y /= dstRect.Width();
	} else {
		scale_x /= dstRect.Width();
		scale_y /= dstRect.Height();
	}

	//const float steps_x = floor(scale_x + 0.5f);
	//const float steps_y = floor(scale_y + 0.5f);

	const float tx0 = (float)srcRect.left - 0.5f;
	const float ty0 = (float)srcRect.top - 0.5f;
	const float tx1 = (float)srcRect.right - 0.5f;
	const float ty1 = (float)srcRect.bottom - 0.5f;

	POINT points[4];
	switch (iRotation) {
	case 90:
		points[0] = { dstRect.right, dstRect.top };
		points[1] = { dstRect.right, dstRect.bottom };
		points[2] = { dstRect.left,  dstRect.top };
		points[3] = { dstRect.left,  dstRect.bottom };
		break;
	case 180:
		points[0] = { dstRect.right, dstRect.bottom };
		points[1] = { dstRect.left,  dstRect.bottom };
		points[2] = { dstRect.right, dstRect.top    };
		points[3] = { dstRect.left,  dstRect.top };
		break;
	case 270:
		points[0] = { dstRect.left,  dstRect.bottom };
		points[1] = { dstRect.left,  dstRect.top    };
		points[2] = { dstRect.right, dstRect.bottom };
		points[3] = { dstRect.right, dstRect.top    };
		break;
	default:
		points[0] = { dstRect.left,  dstRect.top    };
		points[1] = { dstRect.right, dstRect.top    };
		points[2] = { dstRect.left,  dstRect.bottom };
		points[3] = { dstRect.right, dstRect.bottom };
		break;