TImage blink on fade - C++ Builder (Graphics)

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TImage blink on fade

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irlemos
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Posted: Fri Apr 27, 2007 11:56 pm Post subject: TImage blink on fade

Hi,

I'm using BCB5...

I wrote this code based on: http://homepages.borland.com/efg2lab/ImageProcessing/Tween.htm
The code works 100% but during transition the TImage blink...
What can I do to draw without having the image to blink?

void __fastcall TForm1::Fade(int Alpha)
{
img1->Picture->Bitmap->PixelFormat = pf24bit;
img2->Picture->Bitmap->PixelFormat = pf24bit;
img3->Picture->Bitmap->PixelFormat = pf24bit;
//img2->Picture->Bitmap = NULL;
dc = CreateTweenBitmap(img1->Picture->Bitmap,100-Alpha,img3-

Quote:

Picture->Bitmap,Alpha);
}

//---------------------------------------------------------------------------

unsigned char __fastcall TForm1::WeightPixels(unsigned long WeightA,
unsigned long pixelA,
unsigned long WeightB,
unsigned long pixelB,
unsigned long
SumWeights)
{
unsigned char result;

result = (unsigned char)floor((WeightA * pixelA + WeightB *
pixelB) / SumWeights);

return result;
}
//---------------------------------------------------------------------------

Graphics::TBitmap * __fastcall
TForm1::CreateTweenBitmap(Graphics::TBitmap *BitmapA, unsigned long
WeightA,

Graphics::TBitmap *BitmapB, unsigned long WeightB)
{
Graphics::TBitmap *result = new Graphics::TBitmap();
const MaxPixelCount = 65536;

typedef TRGBTriple TRGBArray[MaxPixelCount];
typedef TRGBArray *pRGBArray;

TRGBTriple *RowA;
TRGBTriple *RowB;
TRGBTriple *RowTween;

int i;
int j;
unsigned long SumWeights;

SumWeights = WeightA + WeightB;

result->Width = BitmapA->Width;
result->Height = BitmapA->Height;
result->PixelFormat = pf24bit;

// If SumWeights is 0, just return a "empty" white image
i=0; j=0;
if(SumWeights > 0)
{
for(j=0; j<result->Height; j++)
{
RowA = (TRGBTriple*)BitmapA->ScanLine[j];
RowB = (TRGBTriple*)BitmapB->ScanLine[j];
RowTween = (TRGBTriple*)result->ScanLine[j];

for(i=0; i<result->Width; i++ )
{
RowTween[i].rgbtRed = WeightPixels(WeightA,
RowA[i].rgbtRed , WeightB, RowB[i].rgbtRed , SumWeights);
RowTween[i].rgbtGreen = WeightPixels(WeightA,
RowA[i].rgbtGreen, WeightB, RowB[i].rgbtGreen, SumWeights);
RowTween[i].rgbtBlue = WeightPixels(WeightA,
RowA[i].rgbtBlue , WeightB, RowB[i].rgbtBlue , SumWeights);
}//for
}//for
}//if

return result;
}
//---------------------------------------------------------------------------

void __fastcall TForm1::tmr1Timer(TObject *Sender)
{
static iAlpha = 0;

Fade(iAlpha);

if(iAlpha >= 90)
{
tmr1->Enabled = false;
iAlpha = 0;
}
else
{
iAlpha += 10;
}
}
//---------------------------------------------------------------------------

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