From 71bd681d87065d093aa11195d3949cf7b7be4a07 Mon Sep 17 00:00:00 2001
From: michi_cc <michi_cc@openttd.org>
Date: Tue, 4 Oct 2011 21:35:52 +0000
Subject: [PATCH] (svn r23001) -Feature: [NewGRF] Automatically switch to a 32
 bpp blitter on NewGRF indication.

---
 src/gfxinit.cpp     |  7 +++++++
 src/newgrf.cpp      | 23 +++++++++++++++++++++++
 src/newgrf_config.h |  6 ++++++
 3 files changed, 36 insertions(+)

diff --git a/src/gfxinit.cpp b/src/gfxinit.cpp
index b941a53dd8..9edaadc390 100644
--- a/src/gfxinit.cpp
+++ b/src/gfxinit.cpp
@@ -214,6 +214,13 @@ static void SwitchNewGRFBlitter()
 	/* Get blitter of base set. */
 	bool is_32bpp = BaseGraphics::GetUsedSet()->blitter == BLT_32BPP;
 
+	/* Get combined blitter mode of all NewGRFs. */
+	for (GRFConfig *c = _grfconfig; c != NULL; c = c->next) {
+		if (c->status == GCS_DISABLED || c->status == GCS_NOT_FOUND || HasBit(c->flags, GCF_INIT_ONLY)) continue;
+
+		if (c->palette & GRFP_BLT_32BPP) is_32bpp = true;
+	}
+
 	/* A GRF would like a 32 bpp blitter, switch blitter if needed. Never switch if the blitter was specified by the user. */
 	if (_blitter_autodetected && is_32bpp && BlitterFactoryBase::GetCurrentBlitter()->GetScreenDepth() != 0 && BlitterFactoryBase::GetCurrentBlitter()->GetScreenDepth() < 16) {
 		const char *cur_blitter = BlitterFactoryBase::GetCurrentBlitter()->GetName();
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 3266a2c25a..d71479585a 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -6993,6 +6993,28 @@ static bool ChangeGRFPalette(size_t len, ByteReader *buf)
 	return true;
 }
 
+/** Callback function for 'INFO'->'BLTR' to set the blitter info. */
+static bool ChangeGRFBlitter(size_t len, ByteReader *buf)
+{
+	if (len != 1) {
+		grfmsg(2, "StaticGRFInfo: expected only 1 byte for 'INFO'->'BLTR' but got " PRINTF_SIZE ", ignoring this field", len);
+		buf->Skip(len);
+	} else {
+		char data = buf->ReadByte();
+		GRFPalette pal = GRFP_BLT_UNSET;
+		switch (data) {
+			case '8': pal = GRFP_BLT_UNSET; break;
+			case '3': pal = GRFP_BLT_32BPP;  break;
+			default:
+				grfmsg(2, "StaticGRFInfo: unexpected value '%02x' for 'INFO'->'BLTR', ignoring this field", data);
+				return true;
+		}
+		_cur.grfconfig->palette &= ~GRFP_BLT_MASK;
+		_cur.grfconfig->palette |= pal;
+	}
+	return true;
+}
+
 /** Callback function for 'INFO'->'VRSN' to the version of the NewGRF. */
 static bool ChangeGRFVersion(size_t len, ByteReader *buf)
 {
@@ -7282,6 +7304,7 @@ AllowedSubtags _tags_info[] = {
 	AllowedSubtags('DESC', ChangeGRFDescription),
 	AllowedSubtags('NPAR', ChangeGRFNumUsedParams),
 	AllowedSubtags('PALS', ChangeGRFPalette),
+	AllowedSubtags('BLTR', ChangeGRFBlitter),
 	AllowedSubtags('VRSN', ChangeGRFVersion),
 	AllowedSubtags('MINV', ChangeGRFMinVersion),
 	AllowedSubtags('PARA', HandleParameterInfo),
diff --git a/src/newgrf_config.h b/src/newgrf_config.h
index 253b267a5a..bb82732eff 100644
--- a/src/newgrf_config.h
+++ b/src/newgrf_config.h
@@ -58,6 +58,8 @@ enum GRFPalette {
 	GRFP_USE_BIT     = 0,   ///< The bit used for storing the palette to use.
 	GRFP_GRF_OFFSET  = 2,   ///< The offset of the GRFP_GRF data.
 	GRFP_GRF_SIZE    = 2,   ///< The size of the GRFP_GRF data.
+	GRFP_BLT_OFFSET  = 4,   ///< The offset of the GRFP_BLT data.
+	GRFP_BLT_SIZE    = 1,   ///< The size of the GRFP_BLT data.
 
 	GRFP_USE_DOS     = 0x0, ///< The palette state is set to use the DOS palette.
 	GRFP_USE_WINDOWS = 0x1, ///< The palette state is set to use the Windows palette.
@@ -68,6 +70,10 @@ enum GRFPalette {
 	GRFP_GRF_WINDOWS = 0x2 << GRFP_GRF_OFFSET,          ///< The NewGRF says the Windows palette can be used.
 	GRFP_GRF_ANY     = GRFP_GRF_DOS | GRFP_GRF_WINDOWS, ///< The NewGRF says any palette can be used.
 	GRFP_GRF_MASK    = GRFP_GRF_ANY,                    ///< Bitmask to get only the NewGRF supplied information.
+
+	GRFP_BLT_UNSET   = 0x0 << GRFP_BLT_OFFSET,          ///< The NewGRF provided no information or doesn't care about a 32 bpp blitter.
+	GRFP_BLT_32BPP   = 0x1 << GRFP_BLT_OFFSET,          ///< The NewGRF prefers a 32 bpp blitter.
+	GRFP_BLT_MASK    = GRFP_BLT_32BPP,                  ///< Bitmask to only get the blitter information.
 };