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102 lines
4.5 KiB
Plaintext
102 lines
4.5 KiB
Plaintext
/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsimagecache.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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class QgsImageCache : QgsAbstractContentCacheBase
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{
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%Docstring(signature="appended")
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A cache for images derived from raster files.
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:py:class:`QgsImageCache` stores pre-rendered resampled versions of raster image files, allowing efficient
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reuse without incurring the cost of resampling on every render.
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:py:class:`QgsImageCache` is not usually directly created, but rather accessed through
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:py:func:`QgsApplication.imageCache()`.
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.. versionadded:: 3.6
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%End
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%TypeHeaderCode
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#include "qgsimagecache.h"
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%End
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public:
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QgsImageCache( QObject *parent /TransferThis/ = 0 );
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%Docstring
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Constructor for QgsImageCache, with the specified ``parent`` object.
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%End
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QImage pathAsImage( const QString &path, const QSize size, const bool keepAspectRatio, const double opacity, bool &fitsInCache /Out/, bool blocking = false, double targetDpi = 96 );
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%Docstring
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Returns the specified ``path`` rendered as an image. If possible, a pre-existing cached
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version of the image will be used. If not, the image is fetched and resampled to the desired
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size, and then the result cached for subsequent lookups.
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``path`` may be a local file, remote (HTTP) url, or a base 64 encoded string (with a "base64:" prefix).
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The ``size`` parameter dictates the target size of the image. An invalid size indicates the
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original raster image size (with no resampling). A size in which the width or height is
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set to zero will have the zeroed value automatically computed when keepAspectRatio is ``True``.
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If ``keepAspectRatio`` is ``True``, then the original raster aspect ratio will be maintained during
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any resampling operations.
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An ``opacity`` parameter dictates the opacity of the image.
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If the resultant raster was of a sufficiently small size to store in the cache, then ``fitsInCache``
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will be set to ``True``.
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The ``blocking`` boolean forces to wait for loading before returning image. The content is loaded
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in the same thread to ensure provided the image. WARNING: the ``blocking`` parameter must NEVER
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be ``True`` from GUI based applications (like the main QGIS application) or crashes will result. Only for
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use in external scripts or QGIS server.
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Since QGIS 3.22 the ``targetDpi`` argument can be used to specify an explicit DPI to render the image
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at. This is used for some image formats (e.g. PDF) to ensure that content is rendered at the desired
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DPI. This argument is only used when an invalid ``size`` argument is specified. If a valid ``size`` is
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specified then the image will always be rendered at this size, regardless of the ``targetDpi``.
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%End
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QSize originalSize( const QString &path, bool blocking = false ) const;
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%Docstring
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Returns the original size (in pixels) of the image at the specified ``path``.
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``path`` may be a local file, remote (HTTP) url, or a base 64 encoded string (with a "base64:" prefix).
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If ``path`` is a remote file, then an invalid size may be returned while the image is in the process
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of being fetched.
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The ``blocking`` boolean forces to wait for loading before returning the original size. The content is loaded
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in the same thread to ensure provided the original size. WARNING: the ``blocking`` parameter must NEVER
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be ``True`` from GUI based applications (like the main QGIS application) or crashes will result. Only for
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use in external scripts or QGIS server.
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If the image could not be read then an invalid QSize is returned.
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%End
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signals:
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void remoteImageFetched( const QString &url );
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%Docstring
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Emitted when the cache has finished retrieving an image file from a remote ``url``.
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%End
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};
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/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsimagecache.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.pl again *
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************************************************************************/
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