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/*
* DISTRHO Plugin Framework (DPF)
* Copyright (C) 2012-2014 Filipe Coelho <falktx@falktx.com>
*
* Permission to use, copy, modify, and/or distribute this software for any purpose with
* or without fee is hereby granted, provided that the above copyright notice and this
* permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
* TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef DGL_CAIRO_WIDGET_HPP_INCLUDED
#define DGL_CAIRO_WIDGET_HPP_INCLUDED
#include "Widget.hpp"
#include <cairo.h>
#include <cstdio>
START_NAMESPACE_DGL
// -----------------------------------------------------------------------
class CairoWidget : public Widget
{
public:
CairoWidget(Window& parent)
: Widget(parent),
fContext(nullptr),
fSurface(nullptr),
fTextureId(0)
{
}
virtual void setWidth(int width) override
{
if (fArea.getWidth() == width)
return;
Widget::setWidth(width);
_recreateSurface();
}
virtual void setHeight(int height) override
{
if (fArea.getHeight() == height)
return;
Widget::setHeight(height);
_recreateSurface();
}
virtual void setSize(const Size<int>& size) override
{
if (fArea.getSize() == size)
return;
Widget::setSize(size);
_recreateSurface();
}
void setSize(int width, int height)
{
setSize(Size<int>(width, height));
}
protected:
virtual void cairoDisplay(cairo_t* const context) = 0;
private:
void onDisplay() override
{
// wait for sizing
if (fSurface == nullptr || fContext == nullptr)
{
printf("invalid surface\n");
return;
}
if (fTextureId == 0)
glGenTextures(1, &fTextureId);
if (fTextureId == 0)
{
// TODO: invalidate widget
printf("invalid texture\n");
return;
}
#if 1
const int x = getX();
const int y = getY();
const int width = getWidth();
const int height = getHeight();
// draw cairo stuff
cairoDisplay(fContext);
// get cairo surface data (RGB24)
uchar* const surfaceData = cairo_image_surface_get_data(fSurface);
// enable GL texture
glEnable(GL_TEXTURE_RECTANGLE_ARB);
// set texture params
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// bind texture to surface data
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, fTextureId);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, surfaceData);
// draw the texture
// glBegin(GL_QUADS);
// glTexCoord2f(0.0f, 0.0f);
// glVertex2i(x, y);
//
// glTexCoord2f(1.0f, 0.0f);
// glVertex2i(x+width, y);
//
// glTexCoord2f(1.0f, 1.0f);
// glVertex2i(x+width, y+height);
//
// glTexCoord2f(0.0f, 1.0f);
// glVertex2i(x, y+height);
// glEnd();
glBegin(GL_QUADS);
//glTexCoord2i(x, y);
glTexCoord2i(0, 0);
glVertex2i(x, y);
//glTexCoord2i(x+width, y);
glTexCoord2i(width, 0);
glVertex2i(x+width, y);
//glTexCoord2i(x+width, y+height);
glTexCoord2i(width, height);
glVertex2i(x+width, y+height);
//glTexCoord2i(x, y+height);
glTexCoord2i(0, height);
glVertex2i(x, y+height);
glEnd();
// cleanup
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
glDisable(GL_TEXTURE_RECTANGLE_ARB);
#endif
}
void onClose() override
{
if (fContext != nullptr)
{
cairo_destroy(fContext);
fContext = nullptr;
}
if (fSurface != nullptr)
{
cairo_surface_destroy(fSurface);
fSurface = nullptr;
}
if (fTextureId != 0)
{
glDeleteTextures(1, &fTextureId);
fTextureId = 0;
}
}
void _recreateSurface()
{
if (fContext != nullptr)
cairo_destroy(fContext);
if (fSurface != nullptr)
cairo_surface_destroy(fSurface);
fSurface = cairo_image_surface_create(CAIRO_FORMAT_RGB24, fArea.getWidth(), fArea.getHeight());
if (fSurface != nullptr)
fContext = cairo_create(fSurface);
else
fContext = nullptr;
}
private:
cairo_t* fContext;
cairo_surface_t* fSurface;
GLuint fTextureId;
DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CairoWidget)
};
// -----------------------------------------------------------------------
END_NAMESPACE_DGL
#endif // DGL_CAIRO_WIDGET_HPP_INCLUDED
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