bootloader & kernel: Unify bitmap blitting routines.

They were more-or-less duplicated between the two.
2024-11-12 23:44:31 -05:00
parent 6a290d1dd1
commit 029e447bde
5 changed files with 218 additions and 344 deletions
@@ -0,0 +1,178 @@
+/*
+ * Copyright 2008, Stephan Aßmus <[email protected]>
+ * Copyright 2008, Philippe Saint-Pierre <[email protected]>
+ * Copyright 2004-2009, Axel Dörfler, [email protected].
+ * Copyright 2024, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef GENERIC_BLITTER_H
+#define GENERIC_BLITTER_H
+
+
+#include <SupportDefs.h>
+
+
+struct BlitParameters {
+	const uint8* from;
+	uint32 fromWidth;
+	uint16 fromLeft, fromTop;
+	uint16 fromRight, fromBottom;
+
+	uint8* to;
+	uint32 toBytesPerRow;
+	uint16 toLeft, toTop;
+};
+
+
+static void
+blit8(const BlitParameters& params)
+{
+	const uint8* data = params.from;
+	data += (params.fromWidth * params.fromTop + params.fromLeft);
+	uint8* start = (uint8*)(params.to
+		+ params.toBytesPerRow * params.toTop
+		+ 1 * params.toLeft);
+
+	for (int32 y = params.fromTop; y < params.fromBottom; y++) {
+		const uint8* src = data;
+		uint8* dst = start;
+		for (int32 x = params.fromLeft; x < params.fromRight; x++) {
+			dst[0] = src[0];
+			dst++;
+			src++;
+		}
+
+		data += params.fromWidth;
+		start = (uint8*)((addr_t)start + params.toBytesPerRow);
+	}
+}
+
+
+static void
+blit15(const BlitParameters& params)
+{
+	const uint8* data = params.from;
+	data += (params.fromWidth * params.fromTop + params.fromLeft) * 3;
+	uint16* start = (uint16*)(params.to
+		+ params.toBytesPerRow * params.toTop
+		+ 2 * params.toLeft);
+
+	for (int32 y = params.fromTop; y < params.fromBottom; y++) {
+		const uint8* src = data;
+		uint16* dst = start;
+		for (int32 x = params.fromLeft; x < params.fromRight; x++) {
+			dst[0] = ((src[2] >> 3) << 10)
+				| ((src[1] >> 3) << 5)
+				| ((src[0] >> 3));
+
+			dst++;
+			src += 3;
+		}
+
+		data += params.fromWidth * 3;
+		start = (uint16*)((addr_t)start + params.toBytesPerRow);
+	}
+}
+
+
+static void
+blit16(const BlitParameters& params)
+{
+	const uint8* data = params.from;
+	data += (params.fromWidth * params.fromTop + params.fromLeft) * 3;
+	uint16* start = (uint16*)(params.to
+		+ params.toBytesPerRow * params.toTop
+		+ 2 * params.toLeft);
+
+	for (int32 y = params.fromTop; y < params.fromBottom; y++) {
+		const uint8* src = data;
+		uint16* dst = start;
+		for (int32 x = params.fromLeft; x < params.fromRight; x++) {
+			dst[0] = ((src[2] >> 3) << 11)
+				| ((src[1] >> 2) << 5)
+				| ((src[0] >> 3));
+
+			dst++;
+			src += 3;
+		}
+
+		data += params.fromWidth * 3;
+		start = (uint16*)((addr_t)start + params.toBytesPerRow);
+	}
+}
+
+
+static void
+blit24(const BlitParameters& params)
+{
+	const uint8* data = params.from;
+	data += (params.fromWidth * params.fromTop + params.fromLeft) * 3;
+	uint8* start = (uint8*)(params.to
+		+ params.toBytesPerRow * params.toTop
+		+ 3 * params.toLeft);
+
+	for (int32 y = params.fromTop; y < params.fromBottom; y++) {
+		const uint8* src = data;
+		uint8* dst = start;
+		for (int32 x = params.fromLeft; x < params.fromRight; x++) {
+			dst[0] = src[0];
+			dst[1] = src[1];
+			dst[2] = src[2];
+			dst += 3;
+			src += 3;
+		}
+
+		data += params.fromWidth * 3;
+		start = (uint8*)((addr_t)start + params.toBytesPerRow);
+	}
+}
+
+
+static void
+blit32(const BlitParameters& params)
+{
+	const uint8* data = params.from;
+	data += (params.fromWidth * params.fromTop + params.fromLeft) * 3;
+	uint32* start = (uint32*)(params.to
+		+ params.toBytesPerRow * params.toTop
+		+ 4 * params.toLeft);
+
+	for (int32 y = params.fromTop; y < params.fromBottom; y++) {
+		const uint8* src = data;
+		uint32* dst = start;
+		for (int32 x = params.fromLeft; x < params.fromRight; x++) {
+			dst[0] = (src[2] << 16) | (src[1] << 8) | (src[0]);
+			dst++;
+			src += 3;
+		}
+
+		data += params.fromWidth * 3;
+		start = (uint32*)((addr_t)start + params.toBytesPerRow);
+	}
+}
+
+
+static void
+blit(const BlitParameters& params, int32 depth)
+{
+	switch (depth) {
+		case 8:
+			blit8(params);
+			return;
+		case 15:
+			blit15(params);
+			return;
+		case 16:
+			blit16(params);
+			return;
+		case 24:
+			blit24(params);
+			return;
+		case 32:
+			blit32(params);
+			return;
+	}
+}
+
+
+#endif	/* GENERIC_BLITTER_H */