From d914e3415af1c9c7d8644dfa50fdcf9a79cc01d5 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Sun, 10 Apr 2011 01:24:01 +0200
Subject: Make blendmode opaque.

---
 draw/draw_blend.c  | 48 +++++++++++++++++++++++++++++++++++++++++++-----
 draw/draw_device.c |  8 ++++----
 2 files changed, 47 insertions(+), 9 deletions(-)

(limited to 'draw')

diff --git a/draw/draw_blend.c b/draw/draw_blend.c
index 2d68758a..ef9d8c7c 100644
--- a/draw/draw_blend.c
+++ b/draw/draw_blend.c
@@ -4,7 +4,30 @@
 
 typedef unsigned char byte;
 
-const char *fz_blendmode_names[] =
+enum
+{
+	/* PDF 1.4 -- standard separable */
+	FZ_BLEND_NORMAL,
+	FZ_BLEND_MULTIPLY,
+	FZ_BLEND_SCREEN,
+	FZ_BLEND_OVERLAY,
+	FZ_BLEND_DARKEN,
+	FZ_BLEND_LIGHTEN,
+	FZ_BLEND_COLOR_DODGE,
+	FZ_BLEND_COLOR_BURN,
+	FZ_BLEND_HARD_LIGHT,
+	FZ_BLEND_SOFT_LIGHT,
+	FZ_BLEND_DIFFERENCE,
+	FZ_BLEND_EXCLUSION,
+
+	/* PDF 1.4 -- standard non-separable */
+	FZ_BLEND_HUE,
+	FZ_BLEND_SATURATION,
+	FZ_BLEND_COLOR,
+	FZ_BLEND_LUMINOSITY,
+};
+
+static const char *fz_blendmode_names[] =
 {
 	"Normal",
 	"Multiply",
@@ -22,9 +45,24 @@ const char *fz_blendmode_names[] =
 	"Saturation",
 	"Color",
 	"Luminosity",
-	NULL
 };
 
+int fz_find_blendmode(char *name)
+{
+	int i;
+	for (i = 0; i < nelem(fz_blendmode_names); i++)
+		if (!strcmp(name, fz_blendmode_names[i]))
+			return i;
+	return FZ_BLEND_NORMAL;
+}
+
+char *fz_blendmode_name(int blendmode)
+{
+	if (blendmode >= 0 && blendmode < nelem(fz_blendmode_names))
+		return (char*)fz_blendmode_names[blendmode];
+	return "Normal";
+}
+
 /* Separable blend modes */
 
 static inline int fz_screen_byte(int b, int s)
@@ -218,7 +256,7 @@ fz_hue_rgb(int *rr, int *rg, int *rb, int br, int bg, int bb, int sr, int sg, in
 /* Blending loops */
 
 void
-fz_blend_separable(byte * restrict bp, byte * restrict sp, int n, int w, fz_blendmode blendmode)
+fz_blend_separable(byte * restrict bp, byte * restrict sp, int n, int w, int blendmode)
 {
 	int k;
 	int n1 = n - 1;
@@ -266,7 +304,7 @@ fz_blend_separable(byte * restrict bp, byte * restrict sp, int n, int w, fz_blen
 }
 
 void
-fz_blend_nonseparable(byte * restrict bp, byte * restrict sp, int w, fz_blendmode blendmode)
+fz_blend_nonseparable(byte * restrict bp, byte * restrict sp, int w, int blendmode)
 {
 	while (w--)
 	{
@@ -316,7 +354,7 @@ fz_blend_nonseparable(byte * restrict bp, byte * restrict sp, int w, fz_blendmod
 }
 
 void
-fz_blend_pixmap(fz_pixmap *dst, fz_pixmap *src, int alpha, fz_blendmode blendmode)
+fz_blend_pixmap(fz_pixmap *dst, fz_pixmap *src, int alpha, int blendmode)
 {
 	unsigned char *sp, *dp;
 	fz_bbox bbox;
diff --git a/draw/draw_device.c b/draw/draw_device.c
index 1e011b30..ab33dc35 100644
--- a/draw/draw_device.c
+++ b/draw/draw_device.c
@@ -22,7 +22,7 @@ struct fz_draw_device_s
 		fz_bbox scissor;
 		fz_pixmap *dest;
 		fz_pixmap *mask;
-		fz_blendmode blendmode;
+		int blendmode;
 		int luminosity;
 		float alpha;
 		fz_matrix ctm;
@@ -848,7 +848,7 @@ fz_draw_end_mask(void *user)
 }
 
 static void
-fz_draw_begin_group(void *user, fz_rect rect, int isolated, int knockout, fz_blendmode blendmode, float alpha)
+fz_draw_begin_group(void *user, fz_rect rect, int isolated, int knockout, int blendmode, float alpha)
 {
 	fz_draw_device *dev = user;
 	fz_colorspace *model = dev->dest->colorspace;
@@ -882,7 +882,7 @@ fz_draw_end_group(void *user)
 {
 	fz_draw_device *dev = user;
 	fz_pixmap *group = dev->dest;
-	fz_blendmode blendmode;
+	int blendmode;
 	float alpha;
 
 	if (dev->top > 0)
@@ -893,7 +893,7 @@ fz_draw_end_group(void *user)
 		dev->dest = dev->stack[dev->top].dest;
 		dev->scissor = dev->stack[dev->top].scissor;
 
-		if (blendmode == FZ_BLEND_NORMAL)
+		if (blendmode == 0)
 			fz_paint_pixmap(dev->dest, group, alpha * 255);
 		else
 			fz_blend_pixmap(dev->dest, group, alpha * 255, blendmode);
-- 
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