From 61de1fe7e510fdd425686c478439209f6f7a4b73 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Wed, 20 Aug 2014 11:33:55 +0200
Subject: Add full-page color tinting option and key binding to X11 viewer.

win32 supports tinting, but cannot change the color from the default.
---
 source/fitz/pixmap.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'source/fitz')

diff --git a/source/fitz/pixmap.c b/source/fitz/pixmap.c
index a56fdbd9..9ce8ffba 100644
--- a/source/fitz/pixmap.c
+++ b/source/fitz/pixmap.c
@@ -414,6 +414,53 @@ fz_alpha_from_gray(fz_context *ctx, fz_pixmap *gray, int luminosity)
 	return alpha;
 }
 
+void
+fz_tint_pixmap(fz_context *ctx, fz_pixmap *pix, int r, int g, int b)
+{
+	unsigned char *s = pix->samples;
+	int x, y;
+
+	if (pix->colorspace == fz_device_bgr(ctx))
+	{
+		int save = r;
+		r = b;
+		b = save;
+	}
+	else if (pix->colorspace == fz_device_gray(ctx))
+	{
+		g = (r + g + b) / 3;
+	}
+	else if (pix->colorspace != fz_device_rgb(ctx))
+	{
+		fz_throw(ctx, FZ_ERROR_GENERIC, "can only tint RGB, BGR and Gray pixmaps");
+	}
+
+	if (pix->n == 4)
+	{
+		for (x = 0; x < pix->w; x++)
+		{
+			for (y = 0; y < pix->h; y++)
+			{
+				s[0] = fz_mul255(s[0], r);
+				s[1] = fz_mul255(s[1], g);
+				s[2] = fz_mul255(s[2], b);
+				s += 4;
+			}
+		}
+	}
+	else if (pix->n == 2)
+	{
+		for (x = 0; x < pix->w; x++)
+		{
+			for (y = 0; y < pix->h; y++)
+			{
+				*s = fz_mul255(*s, g);
+				s += 2;
+			}
+		}
+	}
+}
+
 void
 fz_invert_pixmap(fz_context *ctx, fz_pixmap *pix)
 {
-- 
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