Remove access to internal surface of Canvas

client/render/CanvasImage.cpp

@@ -0,0 +1,61 @@
+/*
+ * CanvasImage.cpp, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+#include "StdInc.h"
+#include "CanvasImage.h"
+
+#include "../gui/CGuiHandler.h"
+#include "../render/IScreenHandler.h"
+#include "../renderSDL/SDL_Extensions.h"
+
+#include <SDL_image.h>
+#include <SDL_surface.h>
+
+CanvasImage::CanvasImage(const Point & size, CanvasScalingPolicy scalingPolicy)
+	: surface(CSDL_Ext::newSurface(scalingPolicy == CanvasScalingPolicy::IGNORE ? size : (size * GH.screenHandler().getScalingFactor())))
+	, scalingPolicy(scalingPolicy)
+{
+}
+
+void CanvasImage::draw(SDL_Surface * where, const Point & pos, const Rect * src, int scalingFactor) const
+{
+	if(src)
+		CSDL_Ext::blitSurface(surface, *src, where, pos);
+	else
+		CSDL_Ext::blitSurface(surface, where, pos);
+}
+
+void CanvasImage::scaleTo(const Point & size, EScalingAlgorithm algorithm)
+{
+	Point scaledSize = scalingPolicy == CanvasScalingPolicy::IGNORE ? size : (size * GH.screenHandler().getScalingFactor());
+
+	auto newSurface = CSDL_Ext::scaleSurface(surface, scaledSize.x, scaledSize.y, algorithm);
+	SDL_FreeSurface(surface);
+	surface = newSurface;
+}
+
+void CanvasImage::exportBitmap(const boost::filesystem::path & path) const
+{
+	IMG_SavePNG(surface, path.string().c_str());
+}
+
+Canvas CanvasImage::getCanvas()
+{
+	return Canvas::createFromSurface(surface, scalingPolicy);
+}
+
+Rect CanvasImage::contentRect() const
+{
+	return Rect(Point(0, 0), dimensions());
+}
+
+Point CanvasImage::dimensions() const
+{
+	return {surface->w, surface->h};
+}