Fixed bug where background was incorrectly reset given multiple strings

[emielsteerneman]

There is a bug in cudaFonts.cu:479 that causes incorrect backgrounds to be drawn when multiple strings are given to cudaFont::OverlayText. The current rectangle from mRectsCPU is not correctly indexed. Instead, always the first rectangle in mRectsCPU is indexed and reset. Incrementing with numRects fixes this issue.

Code to make the issue more clear:

std::vector< std::pair< std::string, int2 > > labels;
labels.push_back(std::pair<std::string, int2>("Box One", {1100, 700}));
labels.push_back(std::pair<std::string, int2>("Box Two", {1150, 900}));
labels.push_back(std::pair<std::string, int2>("Box Three", {1450, 800}));
font->OverlayText(output, format, width, height, labels, make_float4(255,255,255,255), make_float4(0, 0, 0, 255), 20);

Two images showing the result before and after the fix:

before

after