(svn r10190) -Codechange: merged renderer and blitter to one single class API: blitter

-Codechange: introduced a hierachy of blitters to avoid a lot of code duplication
 Note: this allows much easier adding other types of video-drivers, like OpenGL

src/blitter/8bpp_base.cpp

@@ -0,0 +1,129 @@
+#include "../stdafx.h"
+#include "../gfx.h"
+#include "8bpp_base.hpp"
+
+void Blitter_8bppBase::DrawColorMappingRect(void *dst, int width, int height, int pal)
+{
+	const uint8 *ctab = GetNonSprite(pal) + 1;
+
+	do {
+		for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]];
+		dst = (uint8 *)dst + _screen.pitch;
+	} while (height--);
+}
+
+void *Blitter_8bppBase::MoveTo(const void *video, int x, int y)
+{
+	return (uint8 *)video + x + y * _screen.pitch;
+}
+
+void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 color)
+{
+	*((uint8 *)video + x + y * _screen.pitch) = color;
+}
+
+void Blitter_8bppBase::SetPixelIfEmpty(void *video, int x, int y, uint8 color)
+{
+	uint8 *dst = (uint8 *)video + x + y * _screen.pitch;
+	if (*dst == 0) *dst = color;
+}
+
+void Blitter_8bppBase::SetHorizontalLine(void *video, int width, uint8 color)
+{
+	memset(video, color, width);
+}
+
+void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, uint8 color)
+{
+	int dy;
+	int dx;
+	int stepx;
+	int stepy;
+	int frac;
+
+	dy = (y2 - y) * 2;
+	if (dy < 0) {
+		dy = -dy;
+		stepy = -1;
+	} else {
+		stepy = 1;
+	}
+
+	dx = (x2 - x) * 2;
+	if (dx < 0) {
+		dx = -dx;
+		stepx = -1;
+	} else {
+		stepx = 1;
+	}
+
+	this->SetPixel(video, x, y, color);
+	if (dx > dy) {
+		frac = dy - (dx / 2);
+		while (x != x2) {
+			if (frac >= 0) {
+				y += stepy;
+				frac -= dx;
+			}
+			x += stepx;
+			frac += dy;
+			this->SetPixel(video, x, y, color);
+		}
+	} else {
+		frac = dx - (dy / 2);
+		while (y != y2) {
+			if (frac >= 0) {
+				x += stepx;
+				frac -= dy;
+			}
+			y += stepy;
+			frac += dx;
+			this->SetPixel(video, x, y, color);
+		}
+	}
+}
+
+void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch)
+{
+	int direction = (height < 0) ? -1 : 1;
+	uint8 *dst = (uint8 *)video;
+	uint8 *usrc = (uint8 *)src;
+
+	height = abs(height);
+	for (; height > 0; height--) {
+		memcpy(dst, usrc, width);
+		usrc += src_pitch * direction;
+		dst += _screen.pitch * direction;
+	}
+}
+
+void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
+{
+	int direction = (height < 0) ? -1 : 1;
+	uint8 *udst = (uint8 *)dst;
+	uint8 *src = (uint8 *)video;
+
+	height = abs(height);
+	for (; height > 0; height--) {
+		memcpy(udst, src, width);
+		src += _screen.pitch * direction;
+		udst += dst_pitch * direction;
+	}
+}
+
+void Blitter_8bppBase::MoveBuffer(void *video_dst, const void *video_src, int width, int height)
+{
+	uint8 *dst = (uint8 *)video_dst;
+	uint8 *src = (uint8 *)video_src;
+
+	for (; height > 0; height--) {
+		memmove(dst, src, width);
+		src += _screen.pitch;
+		dst += _screen.pitch;
+	}
+}
+
+int Blitter_8bppBase::BufferSize(int width, int height)
+{
+	return width * height;
+}