Is this issue fixable within our format plugin code, or is it a photoshop limitation?
I am new to Photoshop & Photoshop Plugins. I have reviewed the sdk photoshop documentation & searched web on this subject.
I am working with a photoshop format plugin written by my predecessor who is no longer here.
The plugin is modeled after the simpleFormat plugin.
The plugin is being used on systems running Photoshop CS6 & CC on 64bit Windows 7 with 8GB or more memory.
The plugin allows a file of our format to be opened, read and written.
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ISSUE:
The plugin works fine reading files < 2GB or > 4GB. For files between 2GB and 4GB, the call to allocate memory fails.
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In the plugin's PIPL structure: the FormatMaxSize {32767, 32767} and PluginMaxSize {PlugInMaxSize { 2147483647, 2147483647 }
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In the plugin code; the DoReadStart() method opens the file and reads the file header information. This works fine.
Next, in the DoReadContinue() method: SPsBuffer->New(&bufferSize, buffersize) is returning NULL. see below.
void PluginMain (const int16 selector,
FormatRecordPtr formatParamBlock,
intptr_t * data,
int16 * result)
{
...
gFormatRecord = reinterpret_cast<FormatRecordPtr>(formatParamBlock);
gPluginRef = reinterpret_cast<SPPluginRef>(gFormatRecord->plugInRef);
gResult = result;
gDataHandle = data;
...
| sSPBasic = ((FormatRecordPtr)formatParamBlock)->sSPBasic; |
...
| if (gCountResources == NULL || |
gGetResources == NULL ||
gAddResource == NULL ||
| gFormatRecord->advanceState == NULL) | |||
| { | |||
| *gResult = errPlugInHostInsufficient; | |||
| return; | |||
| } |
| // new for Photoshop 8, big documents, rows and columns are now > 30000 pixels | |||
| if (gFormatRecord->HostSupports32BitCoordinates) | |||
gFormatRecord->PluginUsing32BitCoordinates = true; |
|
...
}
static void DoReadPrepare()
{
gFormatRecord->maxData = 0
}
static void DoReadContinue (void)
{
int32 done;
int32 total;
int32 row;
VPoint imageSize = GetFormatImageSize();
/* Set up the buffer & progress variables. */
done = 0;
total = imageSize.v;
Ptr pixelData = NULL;
Ptr rawData = NULL;
Ptr uncompressedData = NULL;
int64* offsetTable = NULL;
/* allocate the pixel buffer. */
unsigned32 bufferSize = gFormatRecord->planes * imageSize.v * imageSize.h;
pixelData = sPSBuffer->New( &bufferSize, bufferSize ); <====== This allocation fails for file sizes > 2GB & < 4GB.
if (pixelData == NULL)
{
*gResult = memFullErr;
//return;
if(*gResult == memFullErr) { goto ReadContinueCleanUp; }
}