alphablend.c File Reference

#include <windows.h>
#include <wingdi.h>
#include "rosperf.h"

Include dependency graph for alphablend.c:

Go to the source code of this file.

Classes
struct	_ALPHABLEND_CONTEXT

Typedefs
typedef struct _ALPHABLEND_CONTEXT	ALPHABLEND_CONTEXT
typedef struct _ALPHABLEND_CONTEXT *	PALPHABLEND_CONTEXT

Functions
unsigned	AlphaBlendInit (void **Context, PPERF_INFO PerfInfo, unsigned Reps)
void	AlphaBlendCleanup (void *Context, PPERF_INFO PerfInfo)
ULONG	DbgPrint (IN PCSTR Format, IN ...)
void	AlphaBlendProc (void *Context, PPERF_INFO PerfInfo, unsigned Reps)

Typedef Documentation

ALPHABLEND_CONTEXT

typedef struct _ALPHABLEND_CONTEXT ALPHABLEND_CONTEXT

PALPHABLEND_CONTEXT

typedef struct _ALPHABLEND_CONTEXT * PALPHABLEND_CONTEXT

Function Documentation

AlphaBlendCleanup()

void AlphaBlendCleanup	(	void *	Context,
		PPERF_INFO	PerfInfo
	)

Definition at line 52 of file alphablend.c.

{
  PALPHABLEND_CONTEXT ctx = Context;
  DeleteDC(ctx->BitmapDc);
  DeleteObject(ctx->Bitmap);
  HeapFree(GetProcessHeap(), 0, ctx);
}

AlphaBlendInit()

unsigned AlphaBlendInit	(	void **	Context,
		PPERF_INFO	PerfInfo,
		unsigned	Reps
	)

Definition at line 29 of file alphablend.c.

{
  PALPHABLEND_CONTEXT ctx = HeapAlloc(GetProcessHeap(), 0, sizeof (ALPHABLEND_CONTEXT));
  INT x, y;
 
  ctx->BitmapDc = CreateCompatibleDC(PerfInfo->BackgroundDc);
  ctx->Bitmap = CreateCompatibleBitmap(PerfInfo->BackgroundDc, PerfInfo->WndWidth, PerfInfo->WndHeight);
  SelectObject(ctx->BitmapDc, ctx->Bitmap);
 
  for (y = 0; y < PerfInfo->WndHeight; y++)
    {
      for (x = 0; x < PerfInfo->WndWidth; x++)
        {
          SetPixel(ctx->BitmapDc, x, y, RGB(0xff, 0x00, 0x00));
        }
    }
 
  *Context = ctx;
 
  return Reps;
}

AlphaBlendProc()

void AlphaBlendProc	(	void *	Context,
		PPERF_INFO	PerfInfo,
		unsigned	Reps
	)

Definition at line 67 of file alphablend.c.

{
  PALPHABLEND_CONTEXT ctx = Context;
  unsigned Rep;
  BLENDFUNCTION BlendFunc = { AC_SRC_OVER, 0, 0, 0 };
 
  for (Rep = 0; Rep < Reps; Rep++)
    {
      BlendFunc.SourceConstantAlpha = 255 * Rep / Reps;
#if 0
      PatBlt(PerfInfo->BackgroundDc, 0, 0, PerfInfo->WndWidth, PerfInfo->WndHeight, PATCOPY);
#endif
      if (!AlphaBlend(PerfInfo->BackgroundDc, 0, 0, PerfInfo->WndWidth, PerfInfo->WndHeight,
                      ctx->BitmapDc, 0, 0, PerfInfo->WndWidth, PerfInfo->WndHeight,
                      BlendFunc))
        {
          DbgPrint("AlphaBlend failed (0x%lx)\n", GetLastError());
        }
    }
}

DbgPrint()

ULONG DbgPrint	(	IN PCSTR	Format,
		IN ...
	)