Patch #691064: dot matrix scaler

svn-id: r6663

4 files changed, 48 insertions, 2 deletions

diff --git a/common/gameDetector.cpp b/common/gameDetector.cpp
index 3808ccbe6e..c9d1e37608 100644
--- a/common/gameDetector.cpp
+++ b/common/gameDetector.cpp
@@ -47,7 +47,7 @@ static const char USAGE_STRING[] =
 	"\t-p<path>   - look for game in <path>\n"
 	"\t-x[<num>]  - load this savegame (default: 0 - autosave)\n"
 	"\t-f         - fullscreen mode\n"
-	"\t-g<mode>   - graphics mode (normal,2x,3x,2xsai,super2xsai,supereagle,advmame2x,tv2x)\n"
+	"\t-g<mode>   - graphics mode (normal,2x,3x,2xsai,super2xsai,supereagle,advmame2x,tv2x,dotmatrix)\n"
 	"\t-e<mode>   - set music engine (see README for details)\n"
 	"\t-a         - specify game is amiga version\n"
 	"\t-q<lang>   - specify language (en,de,fr,it,pt,es,ja,zh,ko,hb)\n"
@@ -91,6 +91,7 @@ static const struct GraphicsModes gfx_modes[] = {
 	{"supereagle", "SuperEagle", GFX_SUPEREAGLE},
 	{"advmame2x", "AdvMAME2x", GFX_ADVMAME2X},
 	{"tv2x", "TV2x", GFX_TV2X},
+	{"dotmatrix", "DotMatrix", GFX_DOTMATRIX},
 	{0, 0}
 };
 
diff --git a/common/scaler.cpp b/common/scaler.cpp
index d0244996b8..78cd5aee53 100644
--- a/common/scaler.cpp
+++ b/common/scaler.cpp
@@ -32,6 +32,20 @@ static uint32 qlowpixelMask = 0x18631863;
 static uint32 redblueMask = 0xF81F;
 static uint32 greenMask = 0x7E0;
 
+static const uint16 dotmatrix_565[16] = {
+  0x01E0, 0x0007, 0x3800, 0x0000,
+  0x39E7, 0x0000, 0x39E7, 0x0000,
+  0x3800, 0x0000, 0x01E0, 0x0007,
+  0x39E7, 0x0000, 0x39E7, 0x0000
+};
+static const uint16 dotmatrix_555[16] = {
+  0x00E0, 0x0007, 0x1C00, 0x0000,
+  0x1CE7, 0x0000, 0x1CE7, 0x0000,
+  0x1C00, 0x0000, 0x00E0, 0x0007,
+  0x1CE7, 0x0000, 0x1CE7, 0x0000
+};
+static const uint16 *dotmatrix;
+
 int Init_2xSaI(uint32 BitFormat)
 {
 	if (BitFormat == 565) {
@@ -41,6 +55,7 @@ int Init_2xSaI(uint32 BitFormat)
 		qlowpixelMask = 0x18631863;
 		redblueMask = 0xF81F;
 		greenMask = 0x7E0;
+		dotmatrix = dotmatrix_565;
 	} else if (BitFormat == 555) {
 		colorMask = 0x7BDE7BDE;
 		lowPixelMask = 0x04210421;
@@ -48,6 +63,7 @@ int Init_2xSaI(uint32 BitFormat)
 		qlowpixelMask = 0x0C630C63;
 		redblueMask = 0x7C1F;
 		greenMask = 0x3E0;
+		dotmatrix = dotmatrix_555;
 	} else {
 		return 0;
 	}
@@ -830,3 +846,29 @@ void TV2x(uint8 *srcPtr, uint32 srcPitch, uint8 *null, uint8 *dstPtr, uint32 dst
 		q += nextlineDst << 1;
 	}
 }
+
+static inline uint16 DOT_16(uint16 c, int j, int i) {
+  return c - ((c >> 2) & *(dotmatrix + ((j & 3) << 2) + (i & 3)));
+}
+
+void DotMatrix(uint8 *srcPtr, uint32 srcPitch, uint8 *null, uint8 *dstPtr, uint32 dstPitch,
+					int width, int height)
+{
+	unsigned int nextlineSrc = srcPitch / sizeof(uint16);
+	uint16 *p = (uint16 *)srcPtr;
+
+	unsigned int nextlineDst = dstPitch / sizeof(uint16);
+	uint16 *q = (uint16 *)dstPtr;
+
+	for (int j = 0, jj = 0; j < height; ++j, jj += 2) {
+		for (int i = 0, ii = 0; i < width; ++i, ii += 2) {
+			uint16 c = *(p + i);
+			*(q + ii) = DOT_16(c, jj, ii);
+			*(q + ii + 1) = DOT_16(c, jj, ii + 1);
+			*(q + ii + nextlineDst) = DOT_16(c, jj + 1, ii);
+			*(q + ii + nextlineDst + 1) = DOT_16(c, jj + 1, ii + 1);
+		}
+		p += nextlineSrc;
+		q += nextlineDst << 1;
+	}
+}
diff --git a/common/scaler.h b/common/scaler.h
index 893bb12a8a..710fc65507 100644
--- a/common/scaler.h
+++ b/common/scaler.h
@@ -38,5 +38,7 @@ extern void Normal3x(uint8 *srcPtr, uint32 srcPitch, uint8 *null,
 								uint8 *dstPtr, uint32 dstPitch, int width, int height);
 extern void TV2x(uint8 *srcPtr, uint32 srcPitch, uint8 *null,
 								uint8 *dstPtr, uint32 dstPitch, int width, int height);
+extern void DotMatrix(uint8 *srcPtr, uint32 srcPitch, uint8 *null,
+								uint8 *dstPtr, uint32 dstPitch, int width, int height);
 
 #endif
diff --git a/common/system.h b/common/system.h
index 11bf5df53b..5e729551ea 100644
--- a/common/system.h
+++ b/common/system.h
@@ -223,7 +223,8 @@ enum {
 	GFX_SUPER2XSAI = 4,
 	GFX_SUPEREAGLE = 5,
 	GFX_ADVMAME2X = 6,
-	GFX_TV2X = 7
+	GFX_TV2X = 7,
+	GFX_DOTMATRIX = 8
 };