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engines/ags/shared/gfx/image.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ags/shared/gfx/image.h"
+#include "ags/shared/util/file.h"
+#include "ags/shared/util/stream.h"
+#include "ags/lib/allegro.h"
+#include "common/file.h"
+#include "common/str.h"
+#include "common/stream.h"
+#include "common/textconsole.h"
+#include "image/bmp.h"
+#include "image/iff.h"
+#include "image/pcx.h"
+#include "image/tga.h"
+
+#define VGA_COLOR_TRANS(x) ((x) * 255 / 63)
+
+namespace AGS3 {
+
+template<class DECODER>
+BITMAP *decodeImageStream(Common::SeekableReadStream &stream, color *pal) {
+	DECODER decoder;
+
+	if (decoder.loadStream(stream)) {
+		// Create the output surface
+		const Graphics::Surface *src = decoder.getSurface();
+
+		// Copy the decoded surface
+		int bpp = 8 * src->format.bytesPerPixel;
+		if (bpp == 24)
+			bpp = 32;
+		Surface *dest = (Surface *)create_bitmap_ex(bpp, src->w, src->h);
+		dest->blitFrom(*src);
+
+		// Copy the palette
+		const Graphics::Palette &palP = decoder.getPalette();
+		if (pal) {
+			for (uint idx = 0; idx < palP.size(); ++idx) {
+				palP.get(idx, pal[idx].r, pal[idx].g, pal[idx].b);
+				pal[idx].filler = 0xff;
+			}
+		}
+
+		return dest;
+	} else {
+		return nullptr;
+	}
+}
+
+template<class DECODER>
+BITMAP *decodeImage(const char *filename, color *pal) {
+	AGS::Shared::Stream *file = AGS3::AGS::Shared::File::OpenFileRead(filename);
+	if (!file)
+		return nullptr;
+
+	AGS::Shared::ScummVMReadStream f(file);
+	return decodeImageStream<DECODER>(f, pal);
+}
+
+template<class DECODER>
+BITMAP *decodeImage(PACKFILE *pf, color *pal) {
+	if (!pf)
+		return nullptr;
+
+	AGS::Shared::ScummVMPackReadStream f(pf);
+	f.seek(0);
+	return decodeImageStream<DECODER>(f, pal);
+}
+
+BITMAP *load_bmp(const char *filename, color *pal) {
+	return decodeImage<Image::BitmapDecoder>(filename, pal);
+}
+
+BITMAP *load_lbm(const char *filename, color *pal) {
+	return decodeImage<Image::IFFDecoder>(filename, pal);
+}
+
+BITMAP *load_pcx(const char *filename, color *pal) {
+	return decodeImage<Image::PCXDecoder>(filename, pal);
+}
+
+BITMAP *load_tga(const char *filename, color *pal) {
+	return decodeImage<Image::TGADecoder>(filename, pal);
+}
+
+BITMAP *load_bitmap(const char *filename, color *pal) {
+	Common::String fname(filename);
+
+	if (fname.hasSuffixIgnoreCase(".bmp"))
+		return load_bmp(filename, pal);
+	else if (fname.hasSuffixIgnoreCase(".lbm"))
+		return load_lbm(filename, pal);
+	else if (fname.hasSuffixIgnoreCase(".pcx"))
+		return load_pcx(filename, pal);
+	else if (fname.hasSuffixIgnoreCase(".tga"))
+		return load_tga(filename, pal);
+	else
+		error("Unknown image file - %s", filename);
+}
+
+BITMAP *load_bitmap(PACKFILE *pf, color *pal) {
+	BITMAP *result;
+
+	if ((result = decodeImage<Image::BitmapDecoder>(pf, pal)) != nullptr)
+		return result;
+	if ((result = decodeImage<Image::IFFDecoder>(pf, pal)) != nullptr)
+		return result;
+	if ((result = decodeImage<Image::PCXDecoder>(pf, pal)) != nullptr)
+		return result;
+	if ((result = decodeImage<Image::TGADecoder>(pf, pal)) != nullptr)
+		return result;
+
+	error("Unknown image file");
+}
+
+bool save_bitmap(Common::WriteStream &out, BITMAP *bmp, const RGB *pal) {
+	const Graphics::ManagedSurface &src = bmp->getSurface();
+	if (bmp->format.isCLUT8() && pal) {
+		byte palette[256 * 3];
+		for (int c = 0, i = 0; c < 256; ++c, i += 3) {
+			palette[i] = VGA_COLOR_TRANS(pal[c].r);
+			palette[i + 1] = VGA_COLOR_TRANS(pal[c].g);
+			palette[i + 2] = VGA_COLOR_TRANS(pal[c].b);
+		}
+
+		return Image::writeBMP(out, src, palette);
+	} else {
+		return Image::writeBMP(out, src);
+	}
+}
+
+} // namespace AGS