QGIS API Documentation 3.39.0-Master (bca3cdb6021)
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Implementation of threaded rendering for mesh layers. More...
#include <qgsmeshlayerrenderer.h>
Public Member Functions | |
QgsMeshLayerRenderer (QgsMeshLayer *layer, QgsRenderContext &context) | |
Ctor. | |
~QgsMeshLayerRenderer () override=default | |
QgsFeedback * | feedback () const override |
Access to feedback object of the layer renderer (may be nullptr ) | |
bool | forceRasterRender () const override |
Returns true if the renderer must be rendered to a raster paint device (e.g. | |
bool | render () override |
Do the rendering (based on data stored in the class). | |
Public Member Functions inherited from QgsMapLayerRenderer | |
QgsMapLayerRenderer (const QString &layerID, QgsRenderContext *context=nullptr) | |
Constructor for QgsMapLayerRenderer, with the associated layerID and render context. | |
virtual | ~QgsMapLayerRenderer () |
QStringList | errors () const |
Returns list of errors (problems) that happened during the rendering. | |
virtual Qgis::MapLayerRendererFlags | flags () const |
Returns flags which control how the map layer rendering behaves. | |
bool | isReadyToCompose () const |
Returns whether the renderer has already drawn (at least partially) some data. | |
QString | layerId () const |
Gets access to the ID of the layer rendered by this class. | |
QgsRenderContext * | renderContext () |
Returns the render context associated with the renderer. | |
const QgsRenderContext * | renderContext () const |
Returns the render context associated with the renderer. | |
virtual void | setLayerRenderingTimeHint (int time) |
Sets approximate render time (in ms) for the layer to render. | |
QList< QgsRenderedItemDetails * > | takeRenderedItemDetails () |
Takes the list of rendered item details from the renderer. | |
Additional Inherited Members | |
Protected Member Functions inherited from QgsMapLayerRenderer | |
void | appendRenderedItemDetails (QgsRenderedItemDetails *details) |
Appends the details of a rendered item to the renderer. | |
Static Protected Attributes inherited from QgsMapLayerRenderer | |
static constexpr int | MAX_TIME_TO_USE_CACHED_PREVIEW_IMAGE = 3000 |
Maximum time (in ms) to allow display of a previously cached preview image while rendering layers, before switching to a progressive rendering display. | |
Implementation of threaded rendering for mesh layers.
Definition at line 93 of file qgsmeshlayerrenderer.h.
QgsMeshLayerRenderer::QgsMeshLayerRenderer | ( | QgsMeshLayer * | layer, |
QgsRenderContext & | context | ||
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Ctor.
Definition at line 47 of file qgsmeshlayerrenderer.cpp.
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Access to feedback object of the layer renderer (may be nullptr
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Reimplemented from QgsMapLayerRenderer.
Definition at line 181 of file qgsmeshlayerrenderer.cpp.
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overridevirtual |
Returns true
if the renderer must be rendered to a raster paint device (e.g.
QImage).
Some layer settings require layers to be effectively "flattened" while rendering maps, which is achieved by first rendering the layer onto a raster paint device and then compositing the resultant image onto the final map render.
E.g. if a layer contains features with transparency or alternative blending modes, and the effects of these opacity or blending modes should be restricted to only affect other features within the SAME layer, then a flattened raster based render is required.
Subclasses should return true
whenever their corresponding layer settings require the layer to always be rendered using a raster paint device.
Reimplemented from QgsMapLayerRenderer.
Definition at line 412 of file qgsmeshlayerrenderer.cpp.
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overridevirtual |
Do the rendering (based on data stored in the class).
Returns true
if the layer was completely rendered successfully (i.e. the render was not canceled early).
Implements QgsMapLayerRenderer.
Definition at line 378 of file qgsmeshlayerrenderer.cpp.
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Definition at line 164 of file qgsmeshlayerrenderer.h.
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Definition at line 170 of file qgsmeshlayerrenderer.h.
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Definition at line 169 of file qgsmeshlayerrenderer.h.
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Definition at line 173 of file qgsmeshlayerrenderer.h.
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feedback class for cancellation
Definition at line 133 of file qgsmeshlayerrenderer.h.
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Definition at line 142 of file qgsmeshlayerrenderer.h.
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Definition at line 130 of file qgsmeshlayerrenderer.h.
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Definition at line 136 of file qgsmeshlayerrenderer.h.
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Definition at line 167 of file qgsmeshlayerrenderer.h.
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Definition at line 174 of file qgsmeshlayerrenderer.h.
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Definition at line 171 of file qgsmeshlayerrenderer.h.
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Definition at line 162 of file qgsmeshlayerrenderer.h.
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Definition at line 149 of file qgsmeshlayerrenderer.h.
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Definition at line 145 of file qgsmeshlayerrenderer.h.
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Definition at line 147 of file qgsmeshlayerrenderer.h.
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Definition at line 139 of file qgsmeshlayerrenderer.h.
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Definition at line 156 of file qgsmeshlayerrenderer.h.
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Definition at line 155 of file qgsmeshlayerrenderer.h.
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Definition at line 152 of file qgsmeshlayerrenderer.h.
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Definition at line 154 of file qgsmeshlayerrenderer.h.
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Definition at line 159 of file qgsmeshlayerrenderer.h.