From 3207029344392a328d02dcf362783a294708844f Mon Sep 17 00:00:00 2001
From: Felix Domke <tmbinc@elitedvb.net>
Date: Wed, 3 Jun 2009 14:51:33 +0200
Subject: [PATCH] add scaleblit (accel only, so far)

---
 lib/gdi/gpixmap.cpp | 52 +++++++++++++++++++++++++++++++++++++++++----
 lib/gdi/gpixmap.h   |  5 +++--
 2 files changed, 51 insertions(+), 6 deletions(-)

diff --git a/lib/gdi/gpixmap.cpp b/lib/gdi/gpixmap.cpp
index e01e5e43..6f741d85 100644
--- a/lib/gdi/gpixmap.cpp
+++ b/lib/gdi/gpixmap.cpp
@@ -256,25 +256,67 @@ static void blit_8i_to_32_ab(__u32 *dst, __u8 *src, __u32 *pal, int width)
 	}
 }
 
+#define FIX 0x10000
 
-void gPixmap::blit(const gPixmap &src, ePoint pos, const gRegion &clip, int flag)
+void gPixmap::blit(const gPixmap &src, const eRect &_pos, const gRegion &clip, int flag)
 {
+//	eDebug("blit: -> %d.%d %d:%d -> %d.%d %d:%d, flags=%d",
+//		_pos.x(), _pos.y(), _pos.width(), _pos.height(),
+//		clip.extends.x(), clip.extends.y(), clip.extends.width(), clip.extends.height(),
+//		flag);
+	eRect pos = _pos;
+	
+//	eDebug("source size: %d %d", src.size().width(), src.size().height());
+	
+	if (!(flag & blitScale)) /* pos' size is valid only when scaling */
+		pos = eRect(pos.topLeft(), src.size());
+	else if (pos.size() == src.size()) /* no scaling required */
+		flag &= ~blitScale;
+
+	int scale_x = FIX, scale_y = FIX;
+	
+	if (flag & blitScale)
+	{
+		ASSERT(src.size().width());
+		ASSERT(src.size().height());
+		scale_x = pos.size().width() * FIX / src.size().width();
+		scale_y = pos.size().height() * FIX / src.size().height();
+	}
+	
+//	eDebug("SCALE %x %x", scale_x, scale_y);
+
 	for (unsigned int i=0; i<clip.rects.size(); ++i)
 	{
-		eRect area=eRect(pos, src.size());
+//		eDebug("clip rect: %d %d %d %d", clip.rects[i].x(), clip.rects[i].y(), clip.rects[i].width(), clip.rects[i].height());
+		eRect area = pos; /* pos is the virtual (pre-clipping) area on the dest, which can be larger/smaller than src if scaling is enabled */
 		area&=clip.rects[i];
 		area&=eRect(ePoint(0, 0), size());
 
 		if ((area.width()<0) || (area.height()<0))
 			continue;
 
-		eRect srcarea=area;
+		eRect srcarea = area;
 		srcarea.moveBy(-pos.x(), -pos.y());
 
+//		eDebug("srcarea before scale: %d %d %d %d",
+//			srcarea.x(), srcarea.y(), srcarea.width(), srcarea.height());
+		
+		if (flag & blitScale)
+			srcarea = eRect(srcarea.x() * FIX / scale_x, srcarea.y() * FIX / scale_y, srcarea.width() * FIX / scale_x, srcarea.height() * FIX / scale_y);
+
+//		eDebug("srcarea after scale: %d %d %d %d",
+//			srcarea.x(), srcarea.y(), srcarea.width(), srcarea.height());
+
 		if ((surface->data_phys && src.surface->data_phys) && (gAccel::getInstance()))
-			if (!gAccel::getInstance()->blit(surface, src.surface, area.topLeft(), srcarea, flag))
+			if (!gAccel::getInstance()->blit(surface, src.surface, area, srcarea, flag))
 				continue;
 
+		if (flag & blitScale)
+		{
+			eWarning("unimplemented: scale on non-accel surfaces");
+			continue;
+		}
+
 		if ((surface->bpp == 8) && (src.surface->bpp==8))
 		{
 			__u8 *srcptr=(__u8*)src.surface->data;
@@ -400,6 +442,8 @@ void gPixmap::blit(const gPixmap &src, ePoint pos, const gRegion &clip, int flag
 	}
 }
 
+#undef FIX
+
 void gPixmap::mergePalette(const gPixmap &target)
 {
 	if ((!surface->clut.colors) || (!target.surface->clut.colors))
diff --git a/lib/gdi/gpixmap.h b/lib/gdi/gpixmap.h
index e3798bf7..87fb5029 100644
--- a/lib/gdi/gpixmap.h
+++ b/lib/gdi/gpixmap.h
@@ -116,7 +116,8 @@ public:
 	enum
 	{
 		blitAlphaTest=1,
-		blitAlphaBlend=2
+		blitAlphaBlend=2,
+		blitScale=4
 	};
 
 	gPixmap(gSurface *surface);
@@ -139,7 +140,7 @@ private:
 	void fill(const gRegion &clip, const gColor &color);
 	void fill(const gRegion &clip, const gRGB &color);
 	
-	void blit(const gPixmap &src, ePoint pos, const gRegion &clip, int flags=0);
+	void blit(const gPixmap &src, const eRect &pos, const gRegion &clip, int flags=0);
 	
 	void mergePalette(const gPixmap &target);
 	void line(const gRegion &clip, ePoint start, ePoint end, gColor color);
-- 
2.30.2