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-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Qt Software Information (qt-info@nokia.com)
-**
-** This file is part of the QtDeclarative module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** No Commercial Usage
-** This file contains pre-release code and may not be distributed.
-** You may use this file in accordance with the terms and conditions
-** contained in the either Technology Preview License Agreement or the
-** Beta Release License Agreement.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain
-** additional rights. These rights are described in the Nokia Qt LGPL
-** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at qt-sales@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "qfxblendedimage.h"
-#include <QtDeclarative/qmlcontext.h>
-
-#if defined(QFX_RENDER_OPENGL2)
-#include <glbasicshaders.h>
-#endif
-
-QT_BEGIN_NAMESPACE
-
-/*!
- \qmlclass BlendedImage
- \brief The BlendedImage elements blends two different images depending on a blend ratio.
-
- This element can be used to simulate blur on slow devices by setting secondaryUrl with
- a pre-rendered blurred version of primaryUrl.
-
- Note that this class will only work under OpenGL. On the software canvas it will display
- only the primary image unless the blend is > 0.75, in which case it will display only the
- secondary image.
-*/
-
-/*!
- \internal
- \class QFxBlendedImage
- \brief The QFxBlendedImage blends two different images depending on a blend ratio.
-
- This class can be used to simulate blur on slow devices by setting secondaryUrl with
- a pre-rendered blurred version of primaryUrl.
-
- Note that this class will only work under OpenGL. On the software canvas it will display
- only the primary image unless the blend is > 0.75, in which case it will display only the
- secondary image.
-*/
-QFxBlendedImage::QFxBlendedImage(QFxItem *parent)
-: QFxItem(parent), _blend(0), _smooth(false), dirty(false)
-{
-#if defined(QFX_RENDER_OPENGL2)
- setOptions(HasContents);
-#endif
-}
-
-/*!
- Cancels any pending image loads and destroys the image.
-*/
-QFxBlendedImage::~QFxBlendedImage()
-{
- if (!primUrl.isEmpty())
- QFxPixmap::cancelGet(primUrl,this);
- if (!secUrl.isEmpty())
- QFxPixmap::cancelGet(secUrl,this);
-}
-
-/*!
- \qmlproperty string BlendedImage::primaryUrl
- The URL of the first image to be displayed in this item.
-*/
-QUrl QFxBlendedImage::primaryUrl() const
-{
- return primUrl;
-}
-
-void QFxBlendedImage::primaryLoaded()
-{
- primPix = QFxPixmap(primUrl);
- dirty = true;
- update();
-}
-
-void QFxBlendedImage::setPrimaryUrl(const QUrl &url)
-{
- if (primUrl == url)
- return;
- if (!primUrl.isEmpty())
- QFxPixmap::cancelGet(primUrl,this);
- Q_ASSERT(!url.isRelative());
- primUrl = url;
- if (!primUrl.isEmpty())
- QFxPixmap::get(qmlEngine(this), primUrl,this,SLOT(primaryLoaded()));
-}
-
-/*!
- \qmlproperty string BlendedImage::secondaryUrl
- The URL of the second image to be displayed in this item.
-*/
-QUrl QFxBlendedImage::secondaryUrl() const
-{
- return secUrl;
-}
-
-void QFxBlendedImage::secondaryLoaded()
-{
- secPix = QFxPixmap(secUrl);
- dirty = true;
- update();
-}
-
-void QFxBlendedImage::setSecondaryUrl(const QUrl &url)
-{
- if (secUrl == url)
- return;
- if (!secUrl.isEmpty())
- QFxPixmap::cancelGet(secUrl,this);
- Q_ASSERT(!url.isRelative());
- secUrl = url;
- if (!secUrl.isEmpty())
- QFxPixmap::get(qmlEngine(this), secUrl,this,SLOT(secondaryLoaded()));
-}
-
-/*!
- \qmlproperty real BlendedImage::blend
- The ratio used to blend the two images.
-
- If blend has a value of 0, only the first image will be displayed.
- If blend has a value of 1, only the second image will be displayed.
-*/
-qreal QFxBlendedImage::blend() const
-{
- return _blend;
-}
-
-void QFxBlendedImage::setBlend(qreal b)
-{
- _blend = b;
- update();
-}
-
-/*!
- \qmlproperty bool BlendedImage::smooth
-
- Set this property if you want the image to be smoothly filtered when scaled or
- transformed. Smooth filtering gives better visual quality, but is slower. If
- the BlendedImage is displayed at its natural size, this property has no visual or
- performance effect.
-
- \note Generally scaling artifacts are only visible if the image is stationary on
- the screen. A common pattern when animating an image is to disable smooth
- filtering at the beginning of the animation and reenable it at the conclusion.
- */
-bool QFxBlendedImage::smoothTransform() const
-{
- return _smooth;
-}
-
-void QFxBlendedImage::setSmoothTransform(bool s)
-{
- if (_smooth == s)
- return;
- _smooth = s;
- update();
-}
-
-#if defined(QFX_RENDER_QPAINTER)
-
-void QFxBlendedImage::paintContents(QPainter &p)
-{
- if (primUrl.isEmpty() && secUrl.isEmpty())
- return;
-
- if (_smooth) {
- p.save();
- p.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform, _smooth);
- }
-
- if (_blend < 0.75)
- p.drawPixmap(0, 0, primPix);
- else
- p.drawPixmap(0, 0, secPix);
-
- if (_smooth) {
- p.restore();
- }
-}
-
-#elif defined(QFX_RENDER_OPENGL2)
-
-void QFxBlendedImage::paintGLContents(GLPainter &p)
-{
- static DualTextureBlendShader *shader = 0;
- if (!shader)
- shader = new DualTextureBlendShader();
-
- if (dirty) {
- prim.clear();
- sec.clear();
- prim.setImage(primPix.toImage());
- sec.setImage(secPix.toImage());
-
- dirty = false;
- }
-
- if (prim.isNull() || sec.isNull()) {
-
- return;
- }
-
- GLfloat vertices[8];
- GLfloat texVertices[8];
-
- float widthV = width();
- float heightV = height();
- if (!widthV)
- widthV = qMax(primPix.width(), secPix.width());
- if (!heightV)
- heightV = qMax(primPix.height(), secPix.height());
-
- vertices[0] = 0; vertices[1] = heightV;
- vertices[2] = widthV; vertices[3] = heightV;
- vertices[4] = 0; vertices[5] = 0;
- vertices[6] = widthV; vertices[7] = 0;
-
- texVertices[0] = 0; texVertices[1] = 0;
- texVertices[2] = 1; texVertices[3] = 0;
- texVertices[4] = 0; texVertices[5] = 1;
- texVertices[6] = 1; texVertices[7] = 1;
-
- if (_blend == 0 || _blend == 1) {
- QGLShaderProgram *tshader = p.useTextureShader();
-
- GLTexture *tex = 0;
-
- if (_blend == 0)
- tex = &prim;
- else
- tex = &sec;
-
- tshader->setAttributeArray(SingleTextureShader::Vertices, vertices, 2);
- tshader->setAttributeArray(SingleTextureShader::TextureCoords, texVertices, 2);
-
- glBindTexture(GL_TEXTURE_2D, tex->texture());
- glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-
- tshader->disableAttributeArray(SingleTextureShader::Vertices);
- tshader->disableAttributeArray(SingleTextureShader::TextureCoords);
- } else {
-
- glActiveTexture(GL_TEXTURE0);
- glBindTexture(GL_TEXTURE_2D, prim.texture());
- glActiveTexture(GL_TEXTURE1);
- glBindTexture(GL_TEXTURE_2D, sec.texture());
-
- shader->enable();
- shader->setOpacity(1);
- qreal b = _blend;
- if (b > 1) b = 1;
- else if (b < 0) b = 0;
- shader->setBlend(b);
- shader->setTransform(p.activeTransform);
-
- shader->setAttributeArray(DualTextureBlendShader::Vertices, vertices, 2);
- shader->setAttributeArray(DualTextureBlendShader::TextureCoords, texVertices, 2);
- shader->setAttributeArray(DualTextureBlendShader::BlendTextureCoords, texVertices, 2);
-
- glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-
- shader->disableAttributeArray(DualTextureBlendShader::Vertices);
- shader->disableAttributeArray(DualTextureBlendShader::TextureCoords);
- shader->disableAttributeArray(DualTextureBlendShader::BlendTextureCoords);
-
- glBindTexture(GL_TEXTURE_2D, 0);
- glActiveTexture(GL_TEXTURE0);
- }
-}
-#endif
-
-QML_DEFINE_TYPE(QFxBlendedImage,BlendedImage)
-
-QT_END_NAMESPACE
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