From aca8e7f15c4fd9d49875ad2bde27f7f467a6869e Mon Sep 17 00:00:00 2001 From: "Steinar H. Gunderson" Date: Thu, 26 Apr 2018 22:31:27 +0200 Subject: [PATCH] When grabbing the white balance, grab a single pixel instead of the entire framebuffer. --- glwidget.cpp | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/glwidget.cpp b/glwidget.cpp index 574bf61..bf537de 100644 --- a/glwidget.cpp +++ b/glwidget.cpp @@ -152,11 +152,12 @@ void GLWidget::paintGL() } if (should_grab) { - QRgb reference_color = grabFrameBuffer().pixel(grab_x, grab_y); + GLfloat reference_color[4]; + glReadPixels(grab_x, current_height - grab_y - 1, 1, 1, GL_BGRA, GL_FLOAT, reference_color); - double r = srgb_to_linear(qRed(reference_color) / 255.0); - double g = srgb_to_linear(qGreen(reference_color) / 255.0); - double b = srgb_to_linear(qBlue(reference_color) / 255.0); + double r = srgb_to_linear(reference_color[2]); + double g = srgb_to_linear(reference_color[1]); + double b = srgb_to_linear(reference_color[0]); global_mixer->set_wb(grab_output, r, g, b); should_grab = false; } -- 2.39.2