Lines Matching refs:Pixels
9 <title>ImageMagick: MagickCore, C API for ImageMagick: Get or Set Image Pixels</title>
15 <meta name="keywords" content="magickcore, c, api, for, imagemagick:, get, or, set, image, pixels, ImageMagick, PerlMagick, image processing, image, photo, software, Magick++, OpenMP, convert"/>
81 <p>GetAuthenticMetacontent() returns the authentic metacontent corresponding with the last call to QueueAuthenticPixels() or GetVirtualPixels(). NULL is returned if the associated pixels are not available.</p>
103 <p>GetAuthenticPixelQueue() returns the authentic pixels associated corresponding with the last call to QueueAuthenticPixels() or GetAuthenticPixels().</p>
127 <p>The returned pointer may point to a temporary working copy of the pixels or it may point to the original pixels in memory. Performance is maximized if the selected region is part of one row, or one or more full rows, since then there is opportunity to access the pixels in-place (without a copy) if the image is in memory, or in a memory-mapped file. The returned pointer must *never* be deallocated by the user.</p>
129 <p>Pixels accessed via the returned pointer represent a simple array of type Quantum. If the image has corresponding metacontent,call GetAuthenticMetacontent() after invoking GetAuthenticPixels() to obtain the meta-content corresponding to the region. Once the Quantum array has been updated, the changes must be saved back to the underlying image using SyncAuthenticPixels() or they may be lost.</p>
151 <dd> These values define the perimeter of a region of pixels. </dd>
293 <p>GetVirtualPixelQueue() returns the virtual pixels associated corresponding with the last call to QueueAuthenticPixels() or GetVirtualPixels().</p>
315 <p>GetVirtualPixels() returns an immutable pixel region. If the region is successfully accessed, a pointer to it is returned, otherwise NULL is returned. The returned pointer may point to a temporary working copy of the pixels or it may point to the original pixels in memory. Performance is maximized if the selected region is part of one row, or one or more full rows, since there is opportunity to access the pixels in-place (without a copy) if the image is in memory, or in a memory-mapped file. The returned pointer must *never* be deallocated by the user.</p>
317 <p>Pixels accessed via the returned pointer represent a simple array of type Quantum. If the image type is CMYK or the storage class is PseudoClass, call GetAuthenticMetacontent() after invoking GetAuthenticPixels() to access the meta-content (of type void) corresponding to the the region.</p>
319 <p>If you plan to modify the pixels, use GetAuthenticPixels() instead.</p>
343 <dd> These values define the perimeter of a region of pixels. </dd>
353 <p>QueueAuthenticPixels() queues a mutable pixel region. If the region is successfully initialized a pointer to a Quantum array representing the region is returned, otherwise NULL is returned. The returned pointer may point to a temporary working buffer for the pixels or it may point to the final location of the pixels in memory.</p>
357 <p>Performance is maximized if the selected region is part of one row, or one or more full rows, since then there is opportunity to access the pixels in-place (without a copy) if the image is in memory, or in a memory-mapped file. The returned pointer must *never* be deallocated by the user.</p>
359 <p>Pixels accessed via the returned pointer represent a simple array of type Quantum. If the image type is CMYK or the storage class is PseudoClass, call GetAuthenticMetacontent() after invoking GetAuthenticPixels() to obtain the meta-content (of type void) corresponding to the region. Once the Quantum (and/or Quantum) array has been updated, the changes must be saved back to the underlying image using SyncAuthenticPixels() or they may be lost.</p>
381 <dd> These values define the perimeter of a region of pixels. </dd>
391 <p>SetPixelCacheVirtualMethod() sets the "virtual pixels" method for the pixel cache and returns the previous setting. A virtual pixel is any pixel access that is outside the boundaries of the image cache.</p>
422 <p>SyncAuthenticPixels() saves the image pixels to the in-memory or disk cache. The method returns MagickTrue if the pixel region is flushed, otherwise MagickFalse.</p>
