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These rights are described in The Qt Company LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include "qplatformgraphicsbufferhelper.h" #include #include #include #include #include QT_BEGIN_NAMESPACE /*! Convenience function to both lock and bind the buffer to a texture. This function will first try and lock with texture read and texture write access. If this succeeds it will use the bindToTexture function to bind the content to the currently bound texture. If this fail it will try and lock with SWReadAccess and then use the bindSWToTexture convenience function. \a swizzle is suppose to be used by the caller to figure out if the Red and Blue color channels need to be swizzled when rendering. \a rect is the subrect which is desired to be bounded to the texture. This argument has a no less than semantic, meaning more (if not all) of the buffer can be bounded to the texture. An empty QRect is interpreted as entire buffer should be bound. The user should use the AccessTypes returned by isLocked to figure out what lock has been obtained. returns true if the buffer has successfully been bound to the currently bound texture, otherwise returns false. */ bool QPlatformGraphicsBufferHelper::lockAndBindToTexture(QPlatformGraphicsBuffer *graphicsBuffer, bool *swizzle, bool *premultiplied, const QRect &rect) { if (graphicsBuffer->lock(QPlatformGraphicsBuffer::TextureAccess)) { if (!graphicsBuffer->bindToTexture(rect)) { qWarning("Failed to bind %sgraphicsbuffer to texture", ""); return false; } if (swizzle) *swizzle = false; if (premultiplied) *premultiplied = false; } else if (graphicsBuffer->lock(QPlatformGraphicsBuffer::SWReadAccess)) { if (!bindSWToTexture(graphicsBuffer, swizzle, premultiplied, rect)) { qWarning("Failed to bind %sgraphicsbuffer to texture", "SW "); return false; } } else { qWarning("Failed to lock"); return false; } return true; } /*! Convenience function that uploads the current raster content to the currently bound texture. \a swizzleRandB is suppose to be used by the caller to figure out if the Red and Blue color channels need to be swizzled when rendering. This is an optimization. Qt often renders to software buffers interpreting pixels as unsigned ints. When these buffers are uploaded to textures and each color channel per pixel is interpreted as a byte (read sequentially), then the Red and Blue channels are swapped. Conveniently the Alpha buffer will be correct since Qt historically has had the alpha channel as the first channel, while OpenGL typically expects the alpha channel to be the last channel. \a subRect is the subrect which is desired to be bounded to the texture. This argument has a no less than semantic, meaning more (if not all) of the buffer can be bounded to the texture. An empty QRect is interpreted as entire buffer should be bound. This function fails for buffers not capable of locking to SWAccess. Returns true on success, otherwise false. */ bool QPlatformGraphicsBufferHelper::bindSWToTexture(const QPlatformGraphicsBuffer *graphicsBuffer, bool *swizzleRandB, bool *premultipliedB, const QRect &subRect) { #ifndef QT_NO_OPENGL if (!QOpenGLContext::currentContext()) return false; if (!(graphicsBuffer->isLocked() & QPlatformGraphicsBuffer::SWReadAccess)) return false; QSize size = graphicsBuffer->size(); Q_ASSERT(subRect.isEmpty() || QRect(QPoint(0,0), size).contains(subRect)); bool swizzle = false; bool premultiplied = false; QImage::Format imageformat = QImage::toImageFormat(graphicsBuffer->format()); QImage image(graphicsBuffer->data(), size.width(), size.height(), graphicsBuffer->bytesPerLine(), imageformat); if (graphicsBuffer->bytesPerLine() != (size.width() * 4)) { image = image.convertToFormat(QImage::Format_RGBA8888); } else { switch (imageformat) { case QImage::Format_ARGB32_Premultiplied: premultiplied = true; // no break case QImage::Format_RGB32: case QImage::Format_ARGB32: swizzle = true; break; case QImage::Format_RGBA8888_Premultiplied: premultiplied = true; // no break case QImage::Format_RGBX8888: case QImage::Format_RGBA8888: break; default: image = image.convertToFormat(QImage::Format_RGBA8888); break; } } QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions(); QRect rect = subRect; if (rect.isNull() || rect == QRect(QPoint(0,0),size)) { funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.width(), size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, image.constBits()); } else { #ifndef QT_OPENGL_ES_2 if (!QOpenGLContext::currentContext()->isOpenGLES()) { funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, image.width()); funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, image.constScanLine(rect.y()) + rect.x() * 4); funcs->glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); } else #endif { // if the rect is wide enough it's cheaper to just // extend it instead of doing an image copy if (rect.width() >= size.width() / 2) { rect.setX(0); rect.setWidth(size.width()); } // if the sub-rect is full-width we can pass the image data directly to // OpenGL instead of copying, since there's no gap between scanlines if (rect.width() == size.width()) { funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, image.constScanLine(rect.y())); } else { funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, image.copy(rect).constBits()); } } } if (swizzleRandB) *swizzleRandB = swizzle; if (premultipliedB) *premultipliedB = premultiplied; return true; #else Q_UNUSED(graphicsBuffer) Q_UNUSED(swizzleRandB) Q_UNUSED(subRect) return false; #endif // QT_NO_OPENGL } QT_END_NAMESPACE