diff -r 89d6a7a84779 -r 25a17d01db0c Symbian3/PDK/Source/GUID-936A024F-FFBA-530E-A2C6-C835B71633F7.dita --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Symbian3/PDK/Source/GUID-936A024F-FFBA-530E-A2C6-C835B71633F7.dita Fri Jan 22 18:26:19 2010 +0000 @@ -0,0 +1,86 @@ + + + + + +DirectGDI +Library Overview The DirectGDI library provides the key elements of the DirectGDI +component—driver, resources and drawing context. +

Target audience: Device creators.

+DirectGDI is deprecated in Symbian^3. +

The following table identifies the Dynamic Link Library (DLL) that provides +the core DirectGDI functionality.

+ + + + +DLL +LIB +Short Description + + + + +

directgdi.dll

+

directgdi.lib

+

This DLL provides the key elements of DirectGDI—driver, resources +and drawing context.

+
+ + +
+
Key classes

The following table provides a summary +of the key classes that make up the DirectGDI API library.

+ + + +Class +Description + + + + +

CDirectGdiDriver

+

This class defines the API which is used by DirectGDI client applications. +It is implemented using the handle/body idiom. The handle part forms the public +and private API that is used by DirectGDI client applications and other DirectGDI +generic parts. The body part defines the HAI that needs to be implemented +by an adaptation. The implementation of the handle part is generic for all +adaptations. The implementation of the body part is adaptation specific and +provides interfaces for initialization, termination, construction of the concrete +drawing engine and the creation of source or target rendering. This class +is a singleton within a thread. It delegates to an adaptation-specific implementation +that provides a platform-specific mechanism. See DirectGDI +Interface Component Overview for more information.

+
+ +

CDirectGdiContext

+

This class is the new drawing context intended for hardware accelerated +rendering. It defines an API that is very similar to that provided by CFbsBitGc but +which enables hardware accelerated rendering when it is available. A software +implementation can be used on devices where hardware acceleration is not available. +In addition it provides new APIs for drawing using DirectGDI drawable sources. +This class is part of the generic layer and forwards drawing requests to the +adaptation-specific drawing engine to execute.

+
+ +

CDirectGdiFont

+

This class is very similar to the CFbsBitGcFont class. +The major portion of text rendering (for example, font rasterization, layout +and glyph shaping) is done at the generic layer.

+
+ + +
+
+DirectGDI +Component Overview +Off-Screen +Rendering with DirectGDI Tutorial +
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