BLADERUNNER: Performance fixes

Pixel format functions and CLIP functions are too slow in debug builds,
replacing them with static code makes debug builds faster.

4 files changed, 18 insertions, 4 deletions

diff --git a/engines/bladerunner/bladerunner.h b/engines/bladerunner/bladerunner.h
index ebc8bd06b2..5b59a09206 100644
--- a/engines/bladerunner/bladerunner.h
+++ b/engines/bladerunner/bladerunner.h
@@ -329,6 +329,18 @@ static inline const Graphics::PixelFormat gameDataPixelFormat() {
 	return Graphics::PixelFormat(2, 5, 5, 5, 1, 10, 5, 0, 15);
 }
 
+static inline void getGameDataColor(uint16 color, uint8 &a, uint8 &r, uint8 &g, uint8 &b) {
+	// gameDataPixelFormat().colorToARGB(vqaColor, a, r, g, b);
+	// using pixel format functions is too slow on some ports because of runtime checks
+	uint8 r5 = (color >> 10) & 0x1F;
+	uint8 g5 = (color >>  5) & 0x1F;
+	uint8 b5 = (color      ) & 0x1F;
+	a = color >> 15;
+	r = (r5 << 3) | (r5 >> 2);
+	g = (g5 << 3) | (g5 >> 2);
+	b = (b5 << 3) | (b5 >> 2);
+}
+
 static inline const Graphics::PixelFormat screenPixelFormat() {
 	return ((BladeRunnerEngine*)g_engine)->_screenPixelFormat;
 }
diff --git a/engines/bladerunner/font.cpp b/engines/bladerunner/font.cpp
index 8ab205eea1..62b771fd66 100644
--- a/engines/bladerunner/font.cpp
+++ b/engines/bladerunner/font.cpp
@@ -140,7 +140,7 @@ void Font::drawChar(Graphics::Surface *dst, uint32 chr, int x, int y, uint32 col
 		int endX = width + x - 1;
 		while (currentX <= endX && currentX < dst->w) {
 			uint8 a, r, g, b;
-			gameDataPixelFormat().colorToARGB(*srcPtr, a, r, g, b);
+			getGameDataColor(*srcPtr, a, r, g, b);
 			if (!a) { // Alpha is inversed
 				uint32 outColor = color;
 				if (_useFontColor) {
diff --git a/engines/bladerunner/shape.cpp b/engines/bladerunner/shape.cpp
index 60fa869fc1..c844a57b45 100644
--- a/engines/bladerunner/shape.cpp
+++ b/engines/bladerunner/shape.cpp
@@ -111,7 +111,7 @@ void Shape::draw(Graphics::Surface &surface, int x, int y) const {
 			src_p += 2;
 
 			uint8 a, r, g, b;
-			gameDataPixelFormat().colorToARGB(shpColor, a, r, g, b);
+			getGameDataColor(shpColor, a, r, g, b);
 
 			if (!a) {
 				// Ignore the alpha in the output as it is inversed in the input
diff --git a/engines/bladerunner/vqa_decoder.cpp b/engines/bladerunner/vqa_decoder.cpp
index d3250577c2..769a314f82 100644
--- a/engines/bladerunner/vqa_decoder.cpp
+++ b/engines/bladerunner/vqa_decoder.cpp
@@ -834,10 +834,12 @@ void VQADecoder::VQAVideoTrack::VPTRWriteBlock(Graphics::Surface *surface, unsig
 				src_p += 2;
 
 				uint8 a, r, g, b;
-				gameDataPixelFormat().colorToARGB(vqaColor, a, r, g, b);
+				getGameDataColor(vqaColor, a, r, g, b);
 
 				if (!(alpha && a)) {
-					void* dstPtr = surface->getBasePtr(CLIP(dst_x + x, (uint32)0, (uint32)(surface->w - 1)), CLIP(dst_y + y, (uint32)0, (uint32)(surface->h - 1)));
+					// clip is too slow and it is not needed
+					// void* dstPtr = surface->getBasePtr(CLIP(dst_x + x, (uint32)0, (uint32)(surface->w - 1)), CLIP(dst_y + y, (uint32)0, (uint32)(surface->h - 1)));
+					void* dstPtr = surface->getBasePtr(dst_x + x, dst_y + y);
 					// Ignore the alpha in the output as it is inversed in the input
 					drawPixel(*surface, dstPtr, surface->format.RGBToColor(r, g, b));
 				}