Differential D5398 Diff 16792 source/blender/editors/sculpt_paint/paint_vertex_color_ops.c

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Show First 20 Lines • Show All 366 Lines • ▼ Show 20 Lines	static int vertex_color_brightness_contrast_exec(bContext C, wmOperator op)
Object *obact = CTX_data_active_object(C);		Object *obact = CTX_data_active_object(C);

float gain, offset;		float gain, offset;
{		{
float brightness = RNA_float_get(op->ptr, "brightness");		float brightness = RNA_float_get(op->ptr, "brightness");
float contrast = RNA_float_get(op->ptr, "contrast");		float contrast = RNA_float_get(op->ptr, "contrast");
brightness /= 100.0f;		brightness /= 100.0f;
float delta = contrast / 200.0f;		float delta = contrast / 200.0f;
gain = 1.0f - delta * 2.0f;
/*		/*
* The algorithm is by Werner D. Streidt		* The algorithm is by Werner D. Streidt
* (http://visca.com/ffactory/archives/5-99/msg00021.html)		* (http://visca.com/ffactory/archives/5-99/msg00021.html)
* Extracted of OpenCV demhist.c		* Extracted of OpenCV demhist.c
*/		*/
if (contrast > 0) {		if (contrast > 0) {
gain = 1.0f / ((gain != 0.0f) ? gain : FLT_EPSILON);		gain = 1.0f - delta * 2.0f;
		gain = 1.0f / max_ff(gain, FLT_EPSILON);
offset = gain * (brightness - delta);		offset = gain * (brightness - delta);
}		}
else {		else {
delta *= -1;		delta *= -1;
offset = gain * (brightness + delta);		gain = max_ff(1.0f - delta * 2.0f, 0.0f);
		offset = gain * brightness + delta;
}		}
}		}

const struct VPaintTx_BrightContrastData user_data = {		const struct VPaintTx_BrightContrastData user_data = {
.gain = gain,		.gain = gain,
.offset = offset,		.offset = offset,
};		};

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