PSP: refactoring/redesign of the backend

svn-id: r48632

1 files changed, 166 insertions, 0 deletions

diff --git a/backends/platform/psp/psppixelformat.cpp b/backends/platform/psp/psppixelformat.cpp
new file mode 100644
index 0000000000..7758f2c26b
--- /dev/null
+++ b/backends/platform/psp/psppixelformat.cpp
@@ -0,0 +1,166 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/backends/platform/psp/osys_psp.cpp $
+ * $Id: osys_psp.cpp 46126 2009-11-24 14:18:46Z fingolfin $
+ *
+ */
+
+#include "common/scummsys.h" 
+#include "backends/platform/psp/psppixelformat.h" 
+
+//#define __PSP_DEBUG_FUNCS__	/* For debugging function calls */
+//#define __PSP_DEBUG_PRINT__	/* For debug printouts */
+
+#include "backends/platform/psp/trace.h"
+
+// class PSPPixelFormat --------------------------------------
+
+void PSPPixelFormat::set(Type type, bool swap /* = false */) {
+	DEBUG_ENTER_FUNC();
+	PSP_DEBUG_PRINT("type = %d\n", type);
+	
+	format = type;
+	swapRB = swap;
+	
+	switch (type) {
+	case Type_4444:
+	case Type_5551:
+	case Type_5650:
+		bitsPerPixel = 16;
+		break;
+	case Type_8888:
+		bitsPerPixel = 32;
+		break;
+	case Type_Palette_8bit:
+		bitsPerPixel = 8;
+		break;
+	case Type_Palette_4bit:
+		bitsPerPixel = 4;
+		break;
+	case Type_None:
+		bitsPerPixel = 0;
+		break;
+	default:	// This is an error, but let's continue anyway
+		PSP_ERROR("Unhandled value of pixel type[%d]\n", type);
+		bitsPerPixel = 16;
+		break;
+	}
+
+	PSP_DEBUG_PRINT("bitsPerPixel[%u]\n", bitsPerPixel);
+	DEBUG_EXIT_FUNC();
+}
+
+// Convert from ScummVM general PixelFormat to our pixel format
+// For buffer and palette.
+void PSPPixelFormat::convertFromScummvmPixelFormat(const Graphics::PixelFormat *pf,
+												PSPPixelFormat::Type &bufferType,
+												PSPPixelFormat::Type &paletteType,
+												bool &swapRedBlue) {
+	swapRedBlue = false;	 // no red-blue swap by default
+	PSPPixelFormat::Type *target = 0;	// which one we'll be filling
+	
+	if (!pf) {	// Default, pf is NULL
+		bufferType = Type_Palette_8bit;
+		paletteType = Type_5551;
+	} else {	// We have a pf
+		if (pf->bytesPerPixel == 1) {
+			bufferType = Type_Palette_8bit;
+			target = &paletteType;	// The type describes the palette
+		} else if (pf->bytesPerPixel == 2) {
+			paletteType = Type_None;
+			target = &bufferType;	// The type describes the buffer
+		} else {
+			PSP_ERROR("Unknown bpp[%u] in pixeltype. Reverting to 8bpp\n", pf->bytesPerPixel);
+			bufferType = Type_Palette_8bit;
+			target = &paletteType;	// The type describes the palette
+		}
+	
+		// Find out the exact type of the target
+		if (pf->rLoss == 3 && pf->bLoss == 3) {
+			if (pf->gLoss == 3)
+				*target = Type_5551;
+			else
+				*target = Type_5650;
+		} else if (pf->rLoss == 4 && pf->gLoss == 4 && pf->bLoss == 4) {
+			*target = Type_4444;
+		} else if (pf->gLoss == 0 && pf->gShift == 8) {
+			*target = Type_8888;
+		} else if ((pf->gLoss == 0 && pf->gShift == 0) ||
+				   (pf->gLoss == 8 && pf->gShift == 0)) {	// Default CLUT8 can have weird values
+			*target = Type_5551;
+		} else {
+			PSP_ERROR("Unknown Scummvm pixel format.\n");
+			PSP_ERROR("\trLoss[%d], gLoss[%d], bLoss[%d], aLoss[%d]\n\trShift[%d], gShift[%d], bShift[%d], aShift[%d]\n",
+			pf->rLoss, pf->gLoss, pf->bLoss, pf->aLoss,
+			pf->rShift, pf->gShift, pf->bShift, pf->aShift);		
+			*target = Type_Unknown;
+		}
+
+		if (pf->rShift != 0)	{// We allow backend swap of red and blue
+			swapRedBlue = true;
+			PSP_DEBUG_PRINT("detected red/blue swap\n");
+		}
+	}
+}
+
+Graphics::PixelFormat PSPPixelFormat::convertToScummvmPixelFormat(PSPPixelFormat::Type type) {
+	Graphics::PixelFormat pf;
+	
+	switch(type) {
+	case Type_4444:
+		pf.bytesPerPixel = 2;
+		pf.aLoss = 4; 	 pf.rLoss = 4;   pf.gLoss = 4;   pf.bLoss = 4;
+		pf.aShift = 12; pf.rShift = 0;  pf.gShift = 4;  pf.bShift = 8; 
+		break;
+	case Type_5551:
+		pf.bytesPerPixel = 2;
+		pf.aLoss = 7; 	 pf.rLoss = 3;    pf.gLoss = 3;    pf.bLoss = 3;
+		pf.aShift = 15; pf.rShift = 0;   pf.gShift = 5;   pf.bShift = 10; 
+		break;
+	case Type_5650:
+		pf.bytesPerPixel = 2;
+		pf.aLoss = 8; 	  pf.rLoss = 3;    pf.gLoss = 2;    pf.bLoss = 3;
+		pf.aShift = 0;   pf.rShift = 0;   pf.gShift = 5;   pf.bShift = 11; 
+		break;
+	case Type_8888:
+		pf.bytesPerPixel = 4;
+		pf.aLoss = 0; 	  pf.rLoss = 0;    pf.gLoss = 0;    pf.bLoss = 0;
+		pf.aShift = 24;  pf.rShift = 0;   pf.gShift = 8;   pf.bShift = 16; 
+ 		break;
+	default:
+		PSP_ERROR("Unhandled PSPPixelFormat[%u]\n", type);
+		break;
+	}
+	
+	return pf;
+}
+
+uint32 PSPPixelFormat::convertTo32BitColor(uint32 color) {
+	DEBUG_ENTER_FUNC();
+	uint32 r,g,b,a, output;
+	
+	colorToRgba(color, r, g, b, a);
+	output = ((b << 16) | (g << 8) | (r << 0) | (a << 24));
+	PSP_DEBUG_PRINT_FUNC("input color[%x], output[%x]\n", color, output);
+	
+	DEBUG_EXIT_FUNC();
+	return output;
+}