api:dk11:delphi:fmx.gisframework.tgis_bitmapfmx.lockpixels_tgis_pixels_boolean_tgis_bitmapformat_tgis_bitmaplinesorder
Table of Contents
TGIS_BitmapFMX.LockPixels method
DK for Delphi | FMX.GisFramework.TGIS_BitmapFMX.LockPixels | Constructors | Fields | Methods | Properties
Prepare the bitmap for direct pixel access.
Syntax
Overrides TGIS_BitmapAbstract.LockPixels.
// Delphi public procedure LockPixels( var _pixels : TGIS_Pixels; const _writable : Boolean; const _format : TGIS_BitmapFormat; const _order : TGIS_BitmapLinesOrder ); override;
// C++ Builder public: virtual void LockPixels( TGIS_Pixels* &_pixels, const bool _writable, TGIS_BitmapFormat* const _format, TGIS_BitmapLinesOrder* const _order );
Parameters
| Name | Type | Description |
|---|---|---|
| _pixels | TGIS_Pixels | pixel buffer allocated and maintained between LockPixels and UnlockPixels |
| _writable | Boolean | True if the caller will modify pixel values |
| _format | TGIS_BitmapFormat | desired bitmap format of locked pixels; some platform operations require a format different from the native default |
| _order | TGIS_BitmapLinesOrder | desired bitmap lines order of locked pixels; some platform operations require an order different from the native default |
Remarks
Must be paired with UnlockPixels.
USAGE: Lock bitmap pixels before reading or modifying the buffer directly.
bitmap.LockPixels(pixels, True, format, order) pixels[index] = value bitmap.UnlockPixels()
2026/09/20 23:46