From: Steinar H. Gunderson <sgunderson@bigfoot.com>
Date: Thu, 26 Apr 2018 20:31:27 +0000 (+0200)
Subject: When grabbing the white balance, grab a single pixel instead of the entire framebuffer.
X-Git-Tag: 1.7.2~12
X-Git-Url: https://git.sesse.net/?p=nageru;a=commitdiff_plain;h=aca8e7f15c4fd9d49875ad2bde27f7f467a6869e

When grabbing the white balance, grab a single pixel instead of the entire framebuffer.
---

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;
 	}