I don't know how to use the method (PDDrawPageOrCosObjectToBuffer) in the Mac environment.

Use the method of PDDrawPageOrCosObjectToBuffer of Acrobat SDK from DC () in the Mac environment,

I want to get a screenshot of the PDF in the bitmap to the screen.

A description of PDDrawPageOrCosObjectToBuffer () in Acrobat DC SDK API references, but I do not understand how to use the method.

Please tell me this use.

If there is a code example using PDDrawPageOrCosObjectToBuffer (), I'm happy.

Hello

My code is finally working with PDDrawPageOrCosObjectToBuffer. I hope it helps someone:

void releaseBufferForCG (void * / * info * /, const void * data, size_t / * size * /)

{

Free ((void*) Data);

}

CGImageRef CAcrobatBitmapCreator::ConvertToBitmap (const PDPage & i_rPDPage,

ASFixedMatrix & i_rTransform,

int & i_rBitmapWidth,

int & i_rBitmapHeight)

{

Get the rect in user-space coordinates update

ASRealRect updateRectReal = {0,0,0,0};

ASFixedRect boxFixed;

PDPageGetBBox (i_rPDPage & boxFixed);

updateRectReal.top = ASFixedToFloat (boxFixed.top);

updateRectReal.left = ASFixedToFloat (boxFixed.left);

updateRectReal.right = ASFixedToFloat (boxFixed.right);

updateRectReal.bottom = ASFixedToFloat (boxFixed.bottom);

Convert the fixed transformation matrix to real

ASRealMatrix transformReal = {0, 0, 0, 0, 0, 0};

transformReal.a = ASFixedToFloat (i_rTransform.a);

transformReal.b = ASFixedToFloat (i_rTransform.b);

transformReal.c = ASFixedToFloat (i_rTransform.c);

transformReal.d = ASFixedToFloat (i_rTransform.d);

transformReal.tx = ASFixedToFloat (i_rTransform.h);

transformReal.ty = ASFixedToFloat (i_rTransform.v);

ASRealRect destRectReal = {0, i_rBitmapHeight, i_rBitmapWidth, 0}; l, r, t, b

Prepare the buffer for drawing https://forums.adobe.com/thread/1850089

This first call to PDDrawPageOrCosObjectToBuffer is only used to get the size of the buffer.

ASCab flags = ASCabNew();

ASInt32 bitsPerChannel = 8;

ASUns32 bufferSize = PDDrawPageOrCosObjectToBuffer (i_rPDPage,

CosNewNull(),

ASAtomFromString ("DeviceRGB"),

NULL,

NULL,

bitsPerChannel,

flags,

9,

NULL,

& transformReal,

& destRectReal,

& updateRectReal,

NULL,

0,

(NULL);

char buffer = (char *) malloc (bufferSize);

Memset (buffer, 0xff, bufferSize);

Draw in the buffer

ASCabPutBool (flags, kPDPageUseAnnotFacesStr, true);

ASCabPutBool (flags, kPDPageDrawSmoothTextStr, true);

ASCabPutBool (flags, kPDPageDrawSmoothLineArtStr, true);

ASCabPutBool (flags, kPDPageDrawSmoothImageStr, true);

bufferSize = PDDrawPageOrCosObjectToBuffer (i_rPDPage,

CosNewNull(),

ASAtomFromString ("DeviceRGB"),

NULL,

NULL,

bitsPerChannel,

flags,

9,

NULL,

& transformReal,

& destRectReal,

& updateRectReal,

buffer,

bufferSize,

(NULL);

Convert buffer CGImage

// 1. Remove the 4 bytes of padding at the end, in a new buffer.

size_t bytesPerRow = (i_rBitmapWidth * 3);

bytesPerRow = (bytesPerRow % 4 == 0? bytesPerRow: bytesPerRow + (4-(bytesPerRow % 4)));

size_t bytesPerRowForGC = i_rBitmapWidth * 3;

size_t bufferCGSize = bytesPerRowForGC * i_rBitmapHeight;

char * bufferForGC = (char *) malloc (bufferCGSize);

Memset (bufferForGC, 0xff, bufferCGSize);

for (int lineIndex = 0; lineIndex)< i_rbitmapheight;="">

{

char * destGCPtr = bufferForGC + (lineIndex * bytesPerRowForGC);

char * srcPtr = buffer + (lineIndex * bytesPerRow);

If ((srcPtr + bytesPerRowForGC)<= (buffer="" +="" buffersize)="" &&="" (destgcptr="" +="" bytesperrowforgc)=""><= (bufferforgc="" +="" buffercgsize)="">

{

memcpy (destGCPtr, srcPtr, bytesPerRowForGC);

}

on the other

{

break;

}

}

// 2. Create a CGImage using the new buffer.

CGDataProviderRef provider = CGDataProviderCreateWithData (NULL,

bufferForGC,

bufferCGSize,

releaseBufferForCG); Buffer are ions released this reminder

Space color CGColorSpaceRef = CGColorSpaceCreateDeviceRGB();

CGImageRef finalImage = CGImageCreate (i_rBitmapWidth,

i_rBitmapHeight,

bitsPerChannel,

bitsPerChannel * 3.

bytesPerRowForGC,

color, space

kCGImageAlphaNone,

provider,

NULL, / / decode (of remapping the colors)

true, / / interpolate (pixel smoothing)

kCGRenderingIntentDefault);

CGColorSpaceRelease (colorspace);

CGDataProviderRelease (provider);

Free (buffer);

FinalImage return;

}

David

Tags: Acrobat

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