Platform Package reference: Function EwBeginUpdateArea()

Welcome to Embedded Wizard

Quick Tour - a Tutorial

Working with Embedded Wizard

Build Environments

Embedded Wizard Studio

Programming language Chora

Framework Mosaic

Platform Integration Aspects

Framebuffer Concepts

Memory Footprint

Extern Bitmap interface

Integrating an External Application

Implementing Prototyper intrinsics

Certification Aspects

Platform Package reference

Function EwAlloc()

Function EwAddHeapMemoryPool()

Function EwAllocUserColor()

Function EwAnyPendingSignals()

Function EwBeginUpdate()

Function EwBeginUpdateArea()

Function EwColorToIndex()

Function EwCompString()

Function EwConfigViewport()

Function EwCreateBitmap()

Function EwDoneGraphicsEngine()

Function EwDoneHeap()

Function EwDoneViewport()

Function EwDumpHeap()

Function EwEnableGfxTaskTracing()

Function EwEndUpdate()

Function EwFindUserColor()

Function EwFree()

Function EwFreeBitmap()

Function EwFreeUserColor()

Function EwGetAutoObject()

Function EwGetHeapInfo()

Function EwGetLanguage()

Function EwGetStringLength()

Function EwGetUtf8StringLength()

Function EwGetStyles()

Function EwIndexToColor()

Function EwInitGraphicsEngine()

Function EwInitHeap()

Function EwInitViewport()

Function EwLockBitmap()

Function EwLockObject()

Function EwModifyBitmapPalette()

Function EwNewColor()

Function EwNewObject()

Function EwNewObjectIndirect()

Function EwNewPoint()

Function EwNewRect()

Function EwNewString()

Function EwNewStringAnsi()

Function EwNewStringChar()

Function EwNewStringUtf8()

Function EwNextTimerExpiration()

Function EwPrintPerfCounters()

Function EwPrintProfilerStatistic()

Function EwProcessSignals()

Function EwProcessTimers()

Function EwReclaimMemory()

Function EwRegisterFlashAreaReader()

Function EwResetPerfCounters()

Function EwSetLanguage()

Function EwSetStackBaseAddress()

Function EwSetStyles()

Function EwSetUserColor()

Function EwStringToAnsi()

Function EwStringToUtf8()

Function EwUnlockBitmap()

Function EwUnlockObject()

Function EwVerifyHeap()

Basic Data Type Definitions

Type XBitmapLock

Type XViewportProc

Error and Warning Codes

Platform Package reference: Function EwBeginUpdateArea()

Description of the function EwBeginUpdateArea() available in all Platform Packages for C compatible target systems. This function is intended to be used when integrating the Embedded Wizard created GUI application with the underlying graphics subsystem, graphics hardware or other external GUI applications coexisting on the same system.

Declaration

XBitmap* EwBeginUpdateArea( XViewport* aViewport, XRect aArea )

Parameters

aViewport

Viewport to begin the drawing operations.

aArea

Area affected by the drawing operations relative to the top-left corner of the viewport.

Discussion

The function EwBeginUpdateArea() initiates the screen update cycle for the given viewport and provides access to the specified area of its framebuffer via the returned temporary bitmap. The returned bitmap covers the area of the framebuffer and can serve as the destination in all drawing operations until the function EwEndUpdate() is called. Due to the platform specific framebuffer limitations the returned bitmap may not be used as source in the drawing operations.

If successful, the function returns a temporary bitmap providing the access to the framebuffer of the viewport.