diff options
Diffstat (limited to 'src/opengl/qglpixmapfilter.cpp')
| -rw-r--r-- | src/opengl/qglpixmapfilter.cpp | 754 |
1 files changed, 172 insertions, 582 deletions
diff --git a/src/opengl/qglpixmapfilter.cpp b/src/opengl/qglpixmapfilter.cpp index c478630..d4bcbe9 100644 --- a/src/opengl/qglpixmapfilter.cpp +++ b/src/opengl/qglpixmapfilter.cpp @@ -55,11 +55,17 @@ #include "qgl_p.h" #include "private/qapplication_p.h" +#include "private/qdrawhelper_p.h" +#include "private/qmemrotate_p.h" #include "private/qmath_p.h" #include "qmath.h" QT_BEGIN_NAMESPACE +// qpixmapfilter.cpp +void qt_blurImage(QImage &blurImage, qreal radius, bool quality, int transposed = 0); +QImage qt_halfScaled(const QImage &source); + void QGLPixmapFilterBase::bindTexture(const QPixmap &src) const { const_cast<QGLContext *>(QGLContext::currentContext())->d_func()->bindTexture(src, GL_TEXTURE_2D, GL_RGBA, QGLContext::BindOptions(QGLContext::DefaultBindOption | QGLContext::MemoryManagedBindOption)); @@ -102,48 +108,21 @@ private: class QGLPixmapBlurFilter : public QGLCustomShaderStage, public QGLPixmapFilter<QPixmapBlurFilter> { public: - QGLPixmapBlurFilter(QGraphicsBlurEffect::BlurHints hints); - - void setUniforms(QGLShaderProgram *program); - - static QByteArray generateGaussianShader(int radius, bool singlePass = false, bool dropShadow = false); + QGLPixmapBlurFilter(); protected: bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const; - -private: - - mutable QSize m_textureSize; - mutable bool m_horizontalBlur; - mutable bool m_singlePass; - mutable bool m_animatedBlur; - - mutable qreal m_t; - mutable QSize m_targetSize; - - mutable bool m_haveCached; - mutable int m_cachedRadius; - mutable QGraphicsBlurEffect::BlurHints m_hints; }; class QGLPixmapDropShadowFilter : public QGLCustomShaderStage, public QGLPixmapFilter<QPixmapDropShadowFilter> { public: - QGLPixmapDropShadowFilter(QGraphicsBlurEffect::BlurHints hints); + QGLPixmapDropShadowFilter(); void setUniforms(QGLShaderProgram *program); protected: bool processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const; - -private: - mutable QSize m_textureSize; - mutable bool m_horizontalBlur; - mutable bool m_singlePass; - - mutable bool m_haveCached; - mutable int m_cachedRadius; - mutable QGraphicsBlurEffect::BlurHints m_hints; }; extern QGLWidget *qt_gl_share_widget(); @@ -158,31 +137,14 @@ QPixmapFilter *QGL2PaintEngineEx::pixmapFilter(int type, const QPixmapFilter *pr return d->colorizeFilter.data(); case QPixmapFilter::BlurFilter: { - const QPixmapBlurFilter *proto = static_cast<const QPixmapBlurFilter *>(prototype); - if (proto->blurHints() & QGraphicsBlurEffect::AnimationHint) { - if (!d->animationBlurFilter) - d->animationBlurFilter.reset(new QGLPixmapBlurFilter(proto->blurHints())); - return d->animationBlurFilter.data(); - } - if ((proto->blurHints() & QGraphicsBlurEffect::QualityHint) && proto->radius() > 5) { - if (!d->blurFilter) - d->blurFilter.reset(new QGLPixmapBlurFilter(QGraphicsBlurEffect::QualityHint)); - return d->blurFilter.data(); - } - if (!d->fastBlurFilter) - d->fastBlurFilter.reset(new QGLPixmapBlurFilter(QGraphicsBlurEffect::PerformanceHint)); - return d->fastBlurFilter.data(); + if (!d->blurFilter) + d->blurFilter.reset(new QGLPixmapBlurFilter()); + return d->blurFilter.data(); } case QPixmapFilter::DropShadowFilter: { - const QPixmapDropShadowFilter *proto = static_cast<const QPixmapDropShadowFilter *>(prototype); - if (proto->blurRadius() <= 5) { - if (!d->fastDropShadowFilter) - d->fastDropShadowFilter.reset(new QGLPixmapDropShadowFilter(QGraphicsBlurEffect::PerformanceHint)); - return d->fastDropShadowFilter.data(); - } if (!d->dropShadowFilter) - d->dropShadowFilter.reset(new QGLPixmapDropShadowFilter(QGraphicsBlurEffect::QualityHint)); + d->dropShadowFilter.reset(new QGLPixmapDropShadowFilter()); return d->dropShadowFilter.data(); } @@ -311,59 +273,43 @@ bool QGLPixmapConvolutionFilter::processGL(QPainter *painter, const QPointF &pos return true; } -static const char *qt_gl_texture_sampling_helper = - "lowp float texture2DAlpha(lowp sampler2D src, highp vec2 srcCoords) {\n" - " return texture2D(src, srcCoords).a;\n" - "}\n"; - -QGLPixmapBlurFilter::QGLPixmapBlurFilter(QGraphicsBlurEffect::BlurHints hints) - : m_animatedBlur(false) - , m_haveCached(false) - , m_cachedRadius(0) - , m_hints(hints) -{ -} - -// should be even numbers as they will be divided by two -static const int qCachedBlurLevels[] = { 6, 14, 30 }; -static const int qNumCachedBlurTextures = sizeof(qCachedBlurLevels) / sizeof(*qCachedBlurLevels); -static const int qMaxCachedBlurLevel = qCachedBlurLevels[qNumCachedBlurTextures - 1]; - -static qreal qLogBlurLevel(int level) +QGLPixmapBlurFilter::QGLPixmapBlurFilter() { - static bool initialized = false; - static qreal logBlurLevelCache[qNumCachedBlurTextures]; - if (!initialized) { - for (int i = 0; i < qNumCachedBlurTextures; ++i) - logBlurLevelCache[i] = qLn(qCachedBlurLevels[i]); - initialized = true; - } - return logBlurLevelCache[level]; } class QGLBlurTextureInfo { public: - QGLBlurTextureInfo(QSize size, GLuint textureIds[]) - : m_size(size) + QGLBlurTextureInfo(const QImage &image, GLuint tex, qreal r) + : m_texture(tex) + , m_radius(r) { - for (int i = 0; i < qNumCachedBlurTextures; ++i) - m_textureIds[i] = textureIds[i]; + m_paddedImage << image; } ~QGLBlurTextureInfo() { - glDeleteTextures(qNumCachedBlurTextures, m_textureIds); + glDeleteTextures(1, &m_texture); } - QSize size() const { return m_size; } - GLuint textureId(int i) const { return m_textureIds[i]; } + QImage paddedImage(int scaleLevel = 0) const; + GLuint texture() const { return m_texture; } + qreal radius() const { return m_radius; } private: - GLuint m_textureIds[qNumCachedBlurTextures]; - QSize m_size; + mutable QList<QImage> m_paddedImage; + GLuint m_texture; + qreal m_radius; }; +QImage QGLBlurTextureInfo::paddedImage(int scaleLevel) const +{ + for (int i = m_paddedImage.size() - 1; i <= scaleLevel; ++i) + m_paddedImage << qt_halfScaled(m_paddedImage.at(i)); + + return m_paddedImage.at(scaleLevel); +} + class QGLBlurTextureCache : public QObject { public: @@ -373,7 +319,6 @@ public: ~QGLBlurTextureCache(); QGLBlurTextureInfo *takeBlurTextureInfo(const QPixmap &pixmap); - bool fitsInCache(const QPixmap &pixmap) const; bool hasBlurTextureInfo(const QPixmap &pixmap) const; void insertBlurTextureInfo(const QPixmap &pixmap, QGLBlurTextureInfo *info); void clearBlurTextureInfo(const QPixmap &pixmap); @@ -458,12 +403,7 @@ void QGLBlurTextureCache::insertBlurTextureInfo(const QPixmap &pixmap, QGLBlurTe if (timerId) killTimer(timerId); - timerId = startTimer(1000); -} - -bool QGLBlurTextureCache::fitsInCache(const QPixmap &pixmap) const -{ - return pixmap.width() * pixmap.height() <= cache.maxCost(); + timerId = startTimer(8000); } void QGLBlurTextureCache::pixmapDestroyed(QPixmap *pixmap) @@ -474,567 +414,217 @@ void QGLBlurTextureCache::pixmapDestroyed(QPixmap *pixmap) } } -static const char *qt_gl_interpolate_filter = - "uniform lowp float interpolationValue;" - "uniform lowp sampler2D interpolateTarget;" - "uniform highp vec4 interpolateMapping;" - "lowp vec4 customShader(lowp sampler2D src, highp vec2 srcCoords)" - "{" - " return mix(texture2D(interpolateTarget, interpolateMapping.xy + interpolateMapping.zw * srcCoords)," - " texture2D(src, srcCoords), interpolationValue);" - "}"; +static const int qAnimatedBlurLevelIncrement = 16; +static const int qMaxBlurHalfScaleLevel = 1; -static void initializeTexture(GLuint id, int width, int height) +static GLuint generateBlurTexture(const QSize &size, GLenum format = GL_RGBA) { - glBindTexture(GL_TEXTURE_2D, id); - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, - GL_RGBA, GL_UNSIGNED_BYTE, NULL); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); - glBindTexture(GL_TEXTURE_2D, 0); + GLuint texture; + glGenTextures(1, &texture); + glBindTexture(GL_TEXTURE_2D, texture); + glTexImage2D(GL_TEXTURE_2D, 0, format, size.width(), size.height(), 0, format, + GL_UNSIGNED_BYTE, 0); + return texture; } -bool QGLPixmapBlurFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &) const +static inline uint nextMultiple(uint x, uint multiplier) { - QGLPixmapBlurFilter *filter = const_cast<QGLPixmapBlurFilter *>(this); - - QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); - QGLBlurTextureCache *blurTextureCache = QGLBlurTextureCache::cacheForContext(ctx); - - if ((m_hints & QGraphicsBlurEffect::AnimationHint) && blurTextureCache->fitsInCache(src)) { - QRect targetRect = src.rect().adjusted(-qMaxCachedBlurLevel, -qMaxCachedBlurLevel, qMaxCachedBlurLevel, qMaxCachedBlurLevel); - // ensure even dimensions (going to divide by two) - targetRect.setWidth((targetRect.width() + 1) & ~1); - targetRect.setHeight((targetRect.height() + 1) & ~1); - - QGLBlurTextureInfo *info = 0; - if (blurTextureCache->hasBlurTextureInfo(src)) { - info = blurTextureCache->takeBlurTextureInfo(src); - } else { - m_animatedBlur = false; - m_hints = QGraphicsBlurEffect::QualityHint; - m_singlePass = false; - - QGLFramebufferObjectFormat format; - format.setInternalTextureFormat(GLenum(GL_RGBA)); - QGLFramebufferObject *fbo = qgl_fbo_pool()->acquire(targetRect.size() / 2, format, true); - - if (!fbo) - return false; - - QPainter fboPainter(fbo); - QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(fboPainter.paintEngine()); - - glClearColor(0, 0, 0, 0); - glClear(GL_COLOR_BUFFER_BIT); - - // ensure GL_LINEAR filtering is used for scaling down to half the size - fboPainter.setRenderHint(QPainter::SmoothPixmapTransform); - fboPainter.setCompositionMode(QPainter::CompositionMode_Source); - fboPainter.drawPixmap(qMaxCachedBlurLevel / 2, qMaxCachedBlurLevel / 2, - targetRect.width() / 2 - qMaxCachedBlurLevel, targetRect.height() / 2 - qMaxCachedBlurLevel, src); - - GLuint textures[qNumCachedBlurTextures]; // blur textures - glGenTextures(qNumCachedBlurTextures, textures); - GLuint temp; // temp texture - glGenTextures(1, &temp); - - initializeTexture(temp, fbo->width(), fbo->height()); - m_textureSize = fbo->size(); - - int currentBlur = 0; - - QRect fboRect(0, 0, fbo->width(), fbo->height()); - GLuint sourceTexture = fbo->texture(); - for (int i = 0; i < qNumCachedBlurTextures; ++i) { - int targetBlur = qCachedBlurLevels[i] / 2; - - int blurDelta = qRound(qSqrt(targetBlur * targetBlur - currentBlur * currentBlur)); - QByteArray source = generateGaussianShader(blurDelta); - filter->setSource(source); - - currentBlur = targetBlur; - - // now we're going to be nasty and keep using the same FBO with different textures - glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, - GL_TEXTURE_2D, temp, 0); - - m_horizontalBlur = true; - filter->setOnPainter(&fboPainter); - engine->drawTexture(fboRect, sourceTexture, fbo->size(), fboRect); - filter->removeFromPainter(&fboPainter); - - sourceTexture = textures[i]; - initializeTexture(sourceTexture, fbo->width(), fbo->height()); - - glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, - GL_TEXTURE_2D, textures[i], 0); - - m_horizontalBlur = false; - filter->setOnPainter(&fboPainter); - engine->drawTexture(fboRect, temp, fbo->size(), fboRect); - filter->removeFromPainter(&fboPainter); - } - - glDeleteTextures(1, &temp); + uint mod = x % multiplier; + if (mod == 0) + return x; + return x + multiplier - mod; +} - // reattach the original FBO texture - glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, - GL_TEXTURE_2D, fbo->texture(), 0); +void qt_memrotate90_gl(const quint32 *src, int srcWidth, int srcHeight, int srcStride, + quint32 *dest, int dstStride); - fboPainter.end(); +bool QGLPixmapBlurFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &) const +{ + if (radius() < 1) { + painter->drawPixmap(pos, src); + return true; + } - qgl_fbo_pool()->release(fbo); + qreal actualRadius = radius(); - info = new QGLBlurTextureInfo(fboRect.size(), textures); - } + QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); - if (!m_haveCached || !m_animatedBlur) { - m_haveCached = true; - m_animatedBlur = true; - m_hints = QGraphicsBlurEffect::AnimationHint; - filter->setSource(qt_gl_interpolate_filter); - } + QGLBlurTextureCache *blurTextureCache = QGLBlurTextureCache::cacheForContext(ctx); + QGLBlurTextureInfo *info = 0; + int padding = nextMultiple(qCeil(actualRadius), qAnimatedBlurLevelIncrement); + QRect targetRect = src.rect().adjusted(-padding, -padding, padding, padding); - QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine()); - painter->setRenderHint(QPainter::SmoothPixmapTransform); - filter->setOnPainter(painter); + // pad so that we'll be able to half-scale qMaxBlurHalfScaleLevel times + targetRect.setWidth((targetRect.width() + (qMaxBlurHalfScaleLevel-1)) & ~(qMaxBlurHalfScaleLevel-1)); + targetRect.setHeight((targetRect.height() + (qMaxBlurHalfScaleLevel-1)) & ~(qMaxBlurHalfScaleLevel-1)); - qreal logRadius = qLn(radius()); + QSize textureSize; - int t; - for (t = -1; t < qNumCachedBlurTextures - 2; ++t) { - if (logRadius < qLogBlurLevel(t+1)) - break; - } + info = blurTextureCache->takeBlurTextureInfo(src); + if (!info || info->radius() < actualRadius) { + QSize paddedSize = targetRect.size() / 2; - qreal logBase = t >= 0 ? qLogBlurLevel(t) : 0; - m_t = qBound(qreal(0), (logRadius - logBase) / (qLogBlurLevel(t+1) - logBase), qreal(1)); + QImage padded(paddedSize.height(), paddedSize.width(), QImage::Format_ARGB32_Premultiplied); + padded.fill(0); - m_textureSize = info->size(); + if (info) { + int oldPadding = qRound(info->radius()); - glActiveTexture(GL_TEXTURE0 + 3); - if (t >= 0) { - glBindTexture(GL_TEXTURE_2D, info->textureId(t)); - m_targetSize = info->size(); + QPainter p(&padded); + p.setCompositionMode(QPainter::CompositionMode_Source); + p.drawImage((padding - oldPadding) / 2, (padding - oldPadding) / 2, info->paddedImage()); + p.end(); } else { - QGLTexture *texture = - ctx->d_func()->bindTexture(src, GL_TEXTURE_2D, GL_RGBA, - QGLContext::InternalBindOption - | QGLContext::CanFlipNativePixmapBindOption); - m_targetSize = src.size(); - if (!(texture->options & QGLContext::InvertedYBindOption)) - m_targetSize.setHeight(-m_targetSize.height()); + // TODO: combine byteswapping and memrotating into one by declaring + // custom GL_RGBA pixel type and qt_colorConvert template for it + QImage prepadded = qt_halfScaled(src.toImage()).convertToFormat(QImage::Format_ARGB32_Premultiplied); + + // byte-swap and memrotates in one go + qt_memrotate90_gl(reinterpret_cast<const quint32*>(prepadded.bits()), + prepadded.width(), prepadded.height(), prepadded.bytesPerLine(), + reinterpret_cast<quint32*>(padded.scanLine(padding / 2)) + padding / 2, + padded.bytesPerLine()); } - // restrict the target rect to the max of the radii we are interpolating between - int radiusDelta = qMaxCachedBlurLevel - qCachedBlurLevels[t+1]; - targetRect = targetRect.translated(pos.toPoint()).adjusted(radiusDelta, radiusDelta, -radiusDelta, -radiusDelta); - - radiusDelta /= 2; - QRect sourceRect = QRect(QPoint(), m_textureSize).adjusted(radiusDelta, radiusDelta, -radiusDelta, -radiusDelta); - - engine->drawTexture(targetRect, info->textureId(t+1), m_textureSize, sourceRect); - - glActiveTexture(GL_TEXTURE0 + 3); - glBindTexture(GL_TEXTURE_2D, 0); - - filter->removeFromPainter(painter); - blurTextureCache->insertBlurTextureInfo(src, info); - - return true; - } + delete info; + info = new QGLBlurTextureInfo(padded, generateBlurTexture(paddedSize), padding); - if (blurTextureCache->hasBlurTextureInfo(src)) - blurTextureCache->clearBlurTextureInfo(src); - - int actualRadius = qRound(radius()); - int filterRadius = actualRadius; - int fastRadii[] = { 1, 2, 3, 5, 8, 15, 25 }; - if (!(m_hints & QGraphicsBlurEffect::QualityHint)) { - uint i = 0; - for (; i < (sizeof(fastRadii)/sizeof(*fastRadii))-1; ++i) { - if (fastRadii[i+1] > filterRadius) - break; - } - filterRadius = fastRadii[i]; + textureSize = paddedSize; + } else { + textureSize = QSize(info->paddedImage().height(), info->paddedImage().width()); } - m_singlePass = filterRadius <= 3; - - if (!m_haveCached || m_animatedBlur || filterRadius != m_cachedRadius) { - // Only regenerate the shader from source if parameters have changed. - m_haveCached = true; - m_animatedBlur = false; - m_cachedRadius = filterRadius; - QByteArray source = generateGaussianShader(filterRadius, m_singlePass); - filter->setSource(source); + actualRadius *= qreal(0.5); + int level = 1; + for (; level < qMaxBlurHalfScaleLevel; ++level) { + if (actualRadius <= 16) + break; + actualRadius *= qreal(0.5); } - QRect targetRect = QRectF(src.rect()).translated(pos).adjusted(-actualRadius, -actualRadius, actualRadius, actualRadius).toAlignedRect(); + const int s = (1 << level); - if (m_singlePass) { - // prepare for updateUniforms - m_textureSize = src.size(); + int prepadding = qRound(info->radius()); + padding = qMin(prepadding, qCeil(actualRadius) << level); + targetRect = src.rect().adjusted(-padding, -padding, padding, padding); - // ensure GL_LINEAR filtering is used - painter->setRenderHint(QPainter::SmoothPixmapTransform); - filter->setOnPainter(painter); - QBrush pixmapBrush = src; - pixmapBrush.setTransform(QTransform::fromTranslate(pos.x(), pos.y())); - painter->fillRect(targetRect, pixmapBrush); - filter->removeFromPainter(painter); - } else { - QGLFramebufferObjectFormat format; - format.setInternalTextureFormat(GLenum(src.hasAlphaChannel() ? GL_RGBA : GL_RGB)); - QGLFramebufferObject *fbo = qgl_fbo_pool()->acquire(targetRect.size(), format); + targetRect.setWidth(targetRect.width() & ~(s-1)); + targetRect.setHeight(targetRect.height() & ~(s-1)); - if (!fbo) - return false; + int paddingDelta = (prepadding - padding) >> level; - // prepare for updateUniforms - m_textureSize = src.size(); + QRect subRect(paddingDelta, paddingDelta, targetRect.width() >> level, targetRect.height() >> level); + QImage sourceImage = info->paddedImage(level-1); - // horizontal pass, to pixmap - m_horizontalBlur = true; + QImage subImage(subRect.height(), subRect.width(), QImage::Format_ARGB32_Premultiplied); + qt_rectcopy((QRgb *)subImage.bits(), ((QRgb *)sourceImage.scanLine(paddingDelta)) + paddingDelta, + 0, 0, subRect.height(), subRect.width(), subImage.bytesPerLine(), sourceImage.bytesPerLine()); - QPainter fboPainter(fbo); + GLuint texture = info->texture(); - glClearColor(0, 0, 0, 0); - glClear(GL_COLOR_BUFFER_BIT); + qt_blurImage(subImage, actualRadius, blurHints() & QGraphicsBlurEffect::QualityHint, 1); - // ensure GL_LINEAR filtering is used - fboPainter.setRenderHint(QPainter::SmoothPixmapTransform); - fboPainter.setCompositionMode(QPainter::CompositionMode_Source); - filter->setOnPainter(&fboPainter); - QBrush pixmapBrush = src; - pixmapBrush.setTransform(QTransform::fromTranslate(actualRadius, actualRadius)); - fboPainter.fillRect(QRect(0, 0, targetRect.width(), targetRect.height()), pixmapBrush); - filter->removeFromPainter(&fboPainter); - fboPainter.end(); + // subtract one pixel off the end to prevent the bilinear sampling from sampling uninitialized data + QRect textureSubRect = subImage.rect().adjusted(0, 0, -1, -1); + QRectF targetRectF = QRectF(targetRect).adjusted(0, 0, -targetRect.width() / qreal(textureSize.width()), -targetRect.height() / qreal(textureSize.height())); - QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine()); + glBindTexture(GL_TEXTURE_2D, texture); + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, subImage.width(), subImage.height(), GL_RGBA, + GL_UNSIGNED_BYTE, const_cast<const QImage &>(subImage).bits()); - // vertical pass, to painter - m_horizontalBlur = false; - m_textureSize = fbo->size(); + QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine()); + painter->setRenderHint(QPainter::SmoothPixmapTransform); - painter->save(); - // ensure GL_LINEAR filtering is used - painter->setRenderHint(QPainter::SmoothPixmapTransform); - filter->setOnPainter(painter); - engine->drawTexture(targetRect, fbo->texture(), fbo->size(), QRect(QPoint(), targetRect.size()).translated(0, fbo->height() - targetRect.height())); - filter->removeFromPainter(painter); - painter->restore(); + // texture is flipped on the y-axis + targetRectF = QRectF(targetRectF.x(), targetRectF.bottom(), targetRectF.width(), -targetRectF.height()); + engine->drawTexture(targetRectF.translated(pos), texture, textureSize, textureSubRect); - qgl_fbo_pool()->release(fbo); - } + blurTextureCache->insertBlurTextureInfo(src, info); return true; } -void QGLPixmapBlurFilter::setUniforms(QGLShaderProgram *program) -{ - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); - - if (m_animatedBlur) { - program->setUniformValue("interpolateTarget", 3); - program->setUniformValue("interpolationValue", GLfloat(m_t)); - - if (m_textureSize == m_targetSize) { - program->setUniformValue("interpolateMapping", 0.0f, 0.0f, 1.0f, 1.0f); - } else { - float offsetX = (-qMaxCachedBlurLevel - 0.5) / qreal(m_targetSize.width()); - float offsetY = (-qMaxCachedBlurLevel - 0.5) / qreal(m_targetSize.height()); - - if (m_targetSize.height() < 0) - offsetY = 1 + offsetY; - - float scaleX = 2.0f * qreal(m_textureSize.width()) / qreal(m_targetSize.width()); - float scaleY = 2.0f * qreal(m_textureSize.height()) / qreal(m_targetSize.height()); - - program->setUniformValue("interpolateMapping", offsetX, offsetY, scaleX, scaleY); - } - - return; - } +static const char *qt_gl_drop_shadow_filter = + "uniform lowp vec4 shadowColor;" + "lowp vec4 customShader(lowp sampler2D src, highp vec2 srcCoords)" + "{" + " return shadowColor * texture2D(src, srcCoords.yx).a;" + "}"; - if (m_hints & QGraphicsBlurEffect::QualityHint) { - if (m_singlePass) - program->setUniformValue("delta", 1.0 / m_textureSize.width(), 1.0 / m_textureSize.height()); - else if (m_horizontalBlur) - program->setUniformValue("delta", 1.0 / m_textureSize.width(), 0.0); - else - program->setUniformValue("delta", 0.0, 1.0 / m_textureSize.height()); - } else { - qreal blur = radius() / qreal(m_cachedRadius); - - if (m_singlePass) - program->setUniformValue("delta", blur / m_textureSize.width(), blur / m_textureSize.height()); - else if (m_horizontalBlur) - program->setUniformValue("delta", blur / m_textureSize.width(), 0.0); - else - program->setUniformValue("delta", 0.0, blur / m_textureSize.height()); - } -} -static inline qreal gaussian(qreal dx, qreal sigma) +QGLPixmapDropShadowFilter::QGLPixmapDropShadowFilter() { - return exp(-dx * dx / (2 * sigma * sigma)) / (Q_2PI * sigma * sigma); + setSource(qt_gl_drop_shadow_filter); } -QByteArray QGLPixmapBlurFilter::generateGaussianShader(int radius, bool singlePass, bool dropShadow) +bool QGLPixmapDropShadowFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const { - Q_ASSERT(radius >= 1); - - radius = qMin(127, radius); - - static QCache<uint, QByteArray> shaderSourceCache; - uint key = radius | (int(singlePass) << 7) | (int(dropShadow) << 8); - QByteArray *cached = shaderSourceCache.object(key); - if (cached) - return *cached; - - QByteArray source; - source.reserve(1000); - source.append(qt_gl_texture_sampling_helper); - - source.append("uniform highp vec2 delta;\n"); - if (dropShadow) - source.append("uniform mediump vec4 shadowColor;\n"); - source.append("lowp vec4 customShader(lowp sampler2D src, highp vec2 srcCoords) {\n"); - - QVector<qreal> sampleOffsets; - QVector<qreal> weights; - - QVector<qreal> gaussianComponents; - - qreal sigma = radius / 1.65; - - qreal sum = 0; - for (int i = -radius; i < radius; ++i) { - float value = gaussian(i, sigma); - gaussianComponents << value; - sum += value; - } - - // normalize - for (int i = 0; i < gaussianComponents.size(); ++i) - gaussianComponents[i] /= sum; - - for (int i = 0; i < gaussianComponents.size() - 1; i += 2) { - qreal weight = gaussianComponents.at(i) + gaussianComponents.at(i + 1); - qreal offset = i - radius + gaussianComponents.at(i + 1) / weight; - - sampleOffsets << offset; - weights << weight; - } - - int limit = sampleOffsets.size(); - if (singlePass) - limit *= limit; - - QByteArray baseCoordinate = "srcCoords"; - - for (int i = 0; i < limit; ++i) { - QByteArray coordinate = baseCoordinate; - - qreal weight; - if (singlePass) { - const int xIndex = i % sampleOffsets.size(); - const int yIndex = i / sampleOffsets.size(); - - const qreal deltaX = sampleOffsets.at(xIndex); - const qreal deltaY = sampleOffsets.at(yIndex); - weight = weights.at(xIndex) * weights.at(yIndex); - - if (!qFuzzyCompare(deltaX, deltaY)) { - coordinate.append(" + vec2(delta.x * float("); - coordinate.append(QByteArray::number(deltaX)); - coordinate.append("), delta.y * float("); - coordinate.append(QByteArray::number(deltaY)); - coordinate.append("))"); - } else if (!qFuzzyIsNull(deltaX)) { - coordinate.append(" + delta * float("); - coordinate.append(QByteArray::number(deltaX)); - coordinate.append(")"); - } - } else { - const qreal delta = sampleOffsets.at(i); - weight = weights.at(i); - if (!qFuzzyIsNull(delta)) { - coordinate.append(" + delta * float("); - coordinate.append(QByteArray::number(delta)); - coordinate.append(")"); - } - } - - if (i == 0) { - if (dropShadow) - source.append(" mediump float sample = "); - else - source.append(" mediump vec4 sample = "); - } else { - if (dropShadow) - source.append(" sample += "); - else - source.append(" sample += "); - } + QGLPixmapDropShadowFilter *filter = const_cast<QGLPixmapDropShadowFilter *>(this); - source.append("texture2D(src, "); - source.append(coordinate); - source.append(")"); + qreal r = blurRadius(); + QRectF targetRectUnaligned = QRectF(src.rect()).translated(pos + offset()).adjusted(-r, -r, r, r); + QRect targetRect = targetRectUnaligned.toAlignedRect(); - if (dropShadow) - source.append(".a"); + // ensure even dimensions (going to divide by two) + targetRect.setWidth((targetRect.width() + 1) & ~1); + targetRect.setHeight((targetRect.height() + 1) & ~1); - if (!qFuzzyCompare(weight, qreal(1))) { - source.append(" * float("); - source.append(QByteArray::number(weight)); - source.append(");\n"); - } else { - source.append(";\n"); - } - } + QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); + QGLBlurTextureCache *blurTextureCache = QGLBlurTextureCache::cacheForContext(ctx); - source.append(" return "); - if (dropShadow) - source.append("shadowColor * "); - source.append("sample;\n"); - source.append("}\n"); + QGLBlurTextureInfo *info = blurTextureCache->takeBlurTextureInfo(src); + if (!info || info->radius() != r) { + QImage half = qt_halfScaled(src.toImage().alphaChannel()); - cached = new QByteArray(source); - shaderSourceCache.insert(key, cached); + qreal rx = r + targetRect.left() - targetRectUnaligned.left(); + qreal ry = r + targetRect.top() - targetRectUnaligned.top(); - return source; -} + QImage image = QImage(targetRect.size() / 2, QImage::Format_Indexed8); + image.setColorTable(half.colorTable()); + image.fill(0); + int dx = qRound(rx * qreal(0.5)); + int dy = qRound(ry * qreal(0.5)); + qt_rectcopy(image.bits(), half.bits(), dx, dy, + half.width(), half.height(), + image.bytesPerLine(), half.bytesPerLine()); -QGLPixmapDropShadowFilter::QGLPixmapDropShadowFilter(QGraphicsBlurEffect::BlurHints hints) - : m_haveCached(false) - , m_cachedRadius(0) - , m_hints(hints) -{ -} + qt_blurImage(image, r * qreal(0.5), false, 1); -bool QGLPixmapDropShadowFilter::processGL(QPainter *painter, const QPointF &pos, const QPixmap &src, const QRectF &srcRect) const -{ - QGLPixmapDropShadowFilter *filter = const_cast<QGLPixmapDropShadowFilter *>(this); + GLuint texture = generateBlurTexture(image.size(), GL_ALPHA); - int actualRadius = qRound(blurRadius()); - int filterRadius = actualRadius; - m_singlePass = filterRadius <= 3; + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, image.width(), image.height(), GL_ALPHA, + GL_UNSIGNED_BYTE, image.bits()); - if (!m_haveCached || filterRadius != m_cachedRadius) { - // Only regenerate the shader from source if parameters have changed. - m_haveCached = true; - m_cachedRadius = filterRadius; - QByteArray source = QGLPixmapBlurFilter::generateGaussianShader(filterRadius, m_singlePass, true); - filter->setSource(source); + info = new QGLBlurTextureInfo(image, texture, r); } - QRect targetRect = QRectF(src.rect()).translated(pos + offset()).adjusted(-actualRadius, -actualRadius, actualRadius, actualRadius).toAlignedRect(); - - if (m_singlePass) { - // prepare for updateUniforms - m_textureSize = src.size(); - - painter->save(); - // ensure GL_LINEAR filtering is used - painter->setRenderHint(QPainter::SmoothPixmapTransform); - filter->setOnPainter(painter); - QBrush pixmapBrush = src; - pixmapBrush.setTransform(QTransform::fromTranslate(pos.x() + offset().x(), pos.y() + offset().y())); - painter->fillRect(targetRect, pixmapBrush); - filter->removeFromPainter(painter); - painter->restore(); - } else { - QGLFramebufferObjectFormat format; - format.setInternalTextureFormat(GLenum(src.hasAlphaChannel() ? GL_RGBA : GL_RGB)); - QGLFramebufferObject *fbo = qgl_fbo_pool()->acquire(targetRect.size(), format); - - if (!fbo) - return false; - - // prepare for updateUniforms - m_textureSize = src.size(); - - // horizontal pass, to pixmap - m_horizontalBlur = true; - - QPainter fboPainter(fbo); + GLuint texture = info->texture(); - glClearColor(0, 0, 0, 0); - glClear(GL_COLOR_BUFFER_BIT); - - // ensure GL_LINEAR filtering is used - fboPainter.setRenderHint(QPainter::SmoothPixmapTransform); - fboPainter.setCompositionMode(QPainter::CompositionMode_Source); - filter->setOnPainter(&fboPainter); - QBrush pixmapBrush = src; - pixmapBrush.setTransform(QTransform::fromTranslate(actualRadius, actualRadius)); - fboPainter.fillRect(QRect(0, 0, targetRect.width(), targetRect.height()), pixmapBrush); - filter->removeFromPainter(&fboPainter); - fboPainter.end(); - - QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine()); + filter->setOnPainter(painter); - // vertical pass, to painter - m_horizontalBlur = false; - m_textureSize = fbo->size(); + QGL2PaintEngineEx *engine = static_cast<QGL2PaintEngineEx *>(painter->paintEngine()); + painter->setRenderHint(QPainter::SmoothPixmapTransform); - painter->save(); - // ensure GL_LINEAR filtering is used - painter->setRenderHint(QPainter::SmoothPixmapTransform); - filter->setOnPainter(painter); - engine->drawTexture(targetRect, fbo->texture(), fbo->size(), QRectF(0, fbo->height() - targetRect.height(), targetRect.width(), targetRect.height())); - filter->removeFromPainter(painter); - painter->restore(); + engine->drawTexture(targetRect, texture, info->paddedImage().size(), info->paddedImage().rect()); - qgl_fbo_pool()->release(fbo); - } + filter->removeFromPainter(painter); // Now draw the actual pixmap over the top. painter->drawPixmap(pos, src, srcRect); + blurTextureCache->insertBlurTextureInfo(src, info); + return true; } void QGLPixmapDropShadowFilter::setUniforms(QGLShaderProgram *program) { - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); - glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); - QColor col = color(); - if (m_horizontalBlur && !m_singlePass) { - program->setUniformValue("shadowColor", 1.0f, 1.0f, 1.0f, 1.0f); - } else { - qreal alpha = col.alphaF(); - program->setUniformValue("shadowColor", col.redF() * alpha, - col.greenF() * alpha, - col.blueF() * alpha, - alpha); - } - - if (m_hints & QGraphicsBlurEffect::QualityHint) { - if (m_singlePass) - program->setUniformValue("delta", 1.0 / m_textureSize.width(), 1.0 / m_textureSize.height()); - else if (m_horizontalBlur) - program->setUniformValue("delta", 1.0 / m_textureSize.width(), 0.0); - else - program->setUniformValue("delta", 0.0, 1.0 / m_textureSize.height()); - } else { - qreal blur = blurRadius() / qreal(m_cachedRadius); - - if (m_singlePass) - program->setUniformValue("delta", blur / m_textureSize.width(), blur / m_textureSize.height()); - else if (m_horizontalBlur) - program->setUniformValue("delta", blur / m_textureSize.width(), 0.0); - else - program->setUniformValue("delta", 0.0, blur / m_textureSize.height()); - } + qreal alpha = col.alphaF(); + program->setUniformValue("shadowColor", col.redF() * alpha, + col.greenF() * alpha, + col.blueF() * alpha, + alpha); } QT_END_NAMESPACE |