From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 11 Oct 2010 07:24:18 +0000 (+0000)
Subject: Add Image widget
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=850fae783476edfdaf996a008c70c941afb39d62;p=libs%2Fgltk.git

Add Image widget
---

diff --git a/source/image.cpp b/source/image.cpp
new file mode 100644
index 0000000..f7f61bb
--- /dev/null
+++ b/source/image.cpp
@@ -0,0 +1,83 @@
+/* $Id$
+
+This file is part of libmspgltk
+Copyright © 2007  Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#include <msp/gl/bindable.h>
+#include <msp/gl/immediate.h>
+#include <msp/gl/matrix.h>
+#include "image.h"
+#include "part.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GLtk {
+
+Image::Image(const Resources &r, const GL::Texture2D *i):
+	Widget(r),
+	image(i),
+	keep_aspect(true)
+{
+	focusable = false;
+	update_style();
+}
+
+void Image::set_image(const GL::Texture2D *i)
+{
+	image = i;
+}
+
+void Image::set_keep_aspect(bool ka)
+{
+	keep_aspect = ka;
+}
+
+void Image::render_special(const Part &part) const
+{
+	if(part.get_name()=="image")
+	{
+		if(!image)
+			return;
+
+		const Alignment &align = part.get_alignment();
+		Geometry rgeom = part.get_geometry();
+		align.apply(rgeom, geom, part.get_margin());
+
+		if(keep_aspect)
+		{
+			float aspect = static_cast<float>(image->get_width())/image->get_height();
+			if(rgeom.w<rgeom.h*aspect)
+			{
+				unsigned h = static_cast<unsigned>(rgeom.w/aspect);
+				rgeom.y += (rgeom.h-h)*align.y;
+				rgeom.h = h;
+			}
+			else
+			{
+				unsigned w = static_cast<unsigned>(rgeom.h*aspect);
+				rgeom.x += (rgeom.w-w)*align.x;
+				rgeom.w = w;
+			}
+		}
+
+		GL::Bind _bind_tex(image);
+		GL::Immediate imm((GL::COLOR4_UBYTE, GL::TEXCOORD2, GL::VERTEX2));
+		imm.color(1.0f, 1.0f, 1.0f);
+		imm.begin(GL::QUADS);
+		imm.texcoord(0.0, 0.0);
+		imm.vertex(rgeom.x, rgeom.y);
+		imm.texcoord(1.0, 0.0);
+		imm.vertex(rgeom.x+rgeom.w, rgeom.y);
+		imm.texcoord(1.0, 1.0);
+		imm.vertex(rgeom.x+rgeom.w, rgeom.y+rgeom.h);
+		imm.texcoord(0.0, 1.0);
+		imm.vertex(rgeom.x, rgeom.y+rgeom.h);
+		imm.end();
+	}
+}
+
+} // namespace GLtk
+} // namespace Msp
diff --git a/source/image.h b/source/image.h
new file mode 100644
index 0000000..5d113cc
--- /dev/null
+++ b/source/image.h
@@ -0,0 +1,39 @@
+/* $Id$
+
+This file is part of libmspgltk
+Copyright © 2007  Mikko Rasa, Mikkosoft Productions
+Distributed under the LGPL
+*/
+
+#ifndef MSP_GLTK_IMAGE_H_
+#define MSP_GLTK_IMAGE_H_
+
+#include <msp/gl/texture2d.h>
+#include "widget.h"
+
+namespace Msp {
+namespace GLtk {
+
+/**
+A widget for displaying images.
+*/
+class Image: public Widget
+{
+private:
+	const GL::Texture2D *image;
+	bool keep_aspect;
+
+public:
+	Image(const Resources &, const GL::Texture2D * = 0);
+
+	void set_image(const GL::Texture2D *);
+	void set_keep_aspect(bool);
+private:
+	virtual const char *get_class() const { return "image"; }
+	virtual void render_special(const Part &) const;
+};
+
+} // namespace GLtk
+} // namespace Msp
+
+#endif