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graphics/svg.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 "graphics/svg.h"
+
+#include "common/endian.h"
+#include "common/stream.h"
+#include "common/textconsole.h"
+#include "graphics/pixelformat.h"
+#define NANOSVG_IMPLEMENTATION
+#include "graphics/nanosvg/nanosvg.h"
+#define NANOSVGRAST_IMPLEMENTATION
+#include "graphics/nanosvg/nanosvgrast.h"
+
+#define PIXELFORMAT Graphics::PixelFormat::createFormatRGBA32()
+
+namespace Graphics {
+
+SVGBitmap::SVGBitmap(Common::SeekableReadStream *in, int dw, int dh)
+	: ManagedSurface(dw, dh, PIXELFORMAT) {
+	if (dw == 0 || dh == 0)
+		return;
+
+	int64 size = in->size();
+	char *data = new char[size + 1];
+
+	in->read(data, size);
+	data[size] = '\0';
+
+	NSVGimage *svg = nsvgParse(data, "px", 96);
+	if (svg == NULL)
+		error("Cannot parse SVG image");
+
+	delete[] data;
+	data = nullptr;
+
+	// Maintain aspect ratio
+	float xRatio = 1.0f * dw / svg->width;
+	float yRatio = 1.0f * dh / svg->height;
+	float ratio = xRatio < yRatio ? xRatio : yRatio;
+
+	NSVGrasterizer *rasterizer = nsvgCreateRasterizer();
+
+	nsvgRasterize(rasterizer, svg, 0, 0, ratio, (byte *)getPixels(), dw, dh, pitch);
+
+	nsvgDeleteRasterizer(rasterizer);
+	nsvgDelete(svg);
+}
+
+} // end of namespace Graphics