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Add growable buffer to support dynamic ktx file sizes.

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This commit is contained in:
Pavel Krajcevski 2014-01-29 14:04:08 -05:00
parent 95ec307380
commit aa7e73c4b3
1 changed files with 20 additions and 8 deletions
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28
IO/src/ImageWriterKTX.cpp
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@ -69,28 +69,39 @@ ImageWriterKTX::ImageWriterKTX(FasTC::Image<> &im)
class ByteWriter {
private:
uint8 *m_Base;
uint8 *m_Head;
uint32 m_BytesWritten;
uint32 m_BufferSz;
public:
ByteWriter(uint8 *dst) : m_Head(dst), m_BytesWritten(0) { }
ByteWriter(uint8 *dst, uint32 sz)
: m_Base(dst), m_Head(dst), m_BytesWritten(0), m_BufferSz(dst? sz : 0) { }
uint8 *GetBytes() const { return m_Base; }
uint32 GetBytesWritten() const { return m_BytesWritten; }
void Write(const uint32 v) {
memcpy(m_Head, &v, 4);
m_Head += 4;
m_BytesWritten += 4;
}
void Write(const void *src, const uint32 nBytes) {
while(m_BytesWritten + nBytes > m_BufferSz) {
m_BufferSz <<= 1;
uint8 *newBuffer = new uint8[m_BufferSz];
memcpy(newBuffer, m_Base, m_BytesWritten);
delete m_Base;
m_Base = newBuffer;
m_Head = m_Base + m_BytesWritten;
}
memcpy(m_Head, src, nBytes);
m_Head += nBytes;
m_BytesWritten += nBytes;
}
void Write(const uint32 v) {
Write(&v, 4);
}
};
bool ImageWriterKTX::WriteImage() {
ByteWriter wtr (m_RawFileData);
ByteWriter wtr (m_RawFileData, m_RawFileDataSz);
const uint8 kIdentifier[12] = {
0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A
@ -143,6 +154,7 @@ bool ImageWriterKTX::WriteImage() {
wtr.Write(m_Image.GetPixels(), kImageSize); // imagedata...
}
m_RawFileData = wtr.GetBytes();
m_RawFileDataSz = wtr.GetBytesWritten();
return true;
}