Function HasNonBlackPixelsInRegion

tests/Caption.cpp:26–52

Function to check for non-black pixels in a given region of the frame

// Function to check for non-black pixels in a given region of the frame
bool HasNonBlackPixelsInRegion(const std::shared_ptr<openshot::Frame>& frame, int start_row, int end_row, int start_col, int end_col) {
    int frame_width = frame->GetWidth();
    int frame_height = frame->GetHeight();

    // Ensure the search region is within the frame bounds
    if (start_row < 0 || end_row >= frame_height || start_col < 0 || end_col >= frame_width) {
        throw std::out_of_range("Search region is out of frame bounds");
    }

    for (int row = start_row; row <= end_row; ++row) {
        const unsigned char* pixels = frame->GetPixels(row);
        if (!pixels) {
            throw std::runtime_error("Failed to get pixels for the row");
        }

        for (int col = start_col; col <= end_col; ++col) {
            int index = col * 4;
            int R = pixels[index];
            int G = pixels[index + 1];
            int B = pixels[index + 2];
            if (!(R == 0 && G == 0 && B == 0)) {
                return true;  // Non-black pixel found
            }
        }
    }
    return false;  // No non-black pixel found
}

TEST_CASE("caption effect", "[libopenshot][caption]") {
    // Check for QT Platform Environment variable - and ignore these tests if it's set to offscreen