GIFLoader (InputStream& in)
: input (in),
dataBlockIsZero (false), fresh (false), finished (false),
currentBit (0), lastBit (0), lastByteIndex (0),
codeSize (0), setCodeSize (0), maxCode (0), maxCodeSize (0),
firstcode (0), oldcode (0), clearCode (0), endCode (0)
{
int imageWidth, imageHeight;
if (! getSizeFromHeader (imageWidth, imageHeight))
return;
uint8 buf [16];
if (in.read (buf, 3) != 3)
return;
int numColours = 2 << (buf[0] & 7);
int transparent = -1;
if ((buf[0] & 0x80) != 0)
readPalette (numColours);
for (;;)
{
if (input.read (buf, 1) != 1 || buf[0] == ';')
break;
if (buf[0] == '!')
{
if (readExtension (transparent))
continue;
break;
}
if (buf[0] != ',')
continue;
if (input.read (buf, 9) == 9)
{
imageWidth = (int) ByteOrder::littleEndianShort (buf + 4);
imageHeight = (int) ByteOrder::littleEndianShort (buf + 6);
numColours = 2 << (buf[8] & 7);
if ((buf[8] & 0x80) != 0)
if (! readPalette (numColours))
break;
image = Image (transparent >= 0 ? Image::ARGB : Image::RGB,
imageWidth, imageHeight, transparent >= 0);
image.getProperties()->set ("originalImageHadAlpha", transparent >= 0);
readImage ((buf[8] & 0x40) != 0, transparent);
}
break;
}
}
/*
* Class: org_apache_harmony_awt_gl_image_GifDecoder
* Method: decode
* Signature: ([BIJLorg/apache/harmony/awt/gl/image/GifDecoder$GifDataStream;Lorg/apache/harmony/awt/gl/image/GifDecoder$GifGraphicBlock;)I
*/
JNIEXPORT jint JNICALL Java_org_apache_harmony_awt_gl_image_GifDecoder_decode
(JNIEnv *env,
jobject obj,
jbyteArray jInput,
jint bytesInBuffer,
jlong hDecoder,
jobject dataStream,
jobject currBlock) {
GIF_RETVAL retval = STATUS_OK;
GifDecoder *decoder = getDecoder(env, obj, dataStream, (GifDecoder*) ((IDATA)hDecoder));
int scanlinesDecoded;
decoder->input = decoder->inputPtr =
(*env)->GetPrimitiveArrayCritical(env, jInput, 0);
decoder->bytesInBuffer += bytesInBuffer;
bytesInBuffer = decoder->bytesInBuffer;
while(retval == STATUS_OK && decoder->bytesInBuffer > 0) {
switch(decoder->state) {
case STATE_INIT: {
retval = readHeader(env, decoder);
break;
}
case STATE_AT_GLOBAL_COLOR_TABLE: {
retval = loadColorTable(env, decoder->jGlobalColorTable, decoder);
break;
}
case STATE_AT_LOCAL_COLOR_TABLE: {
retval = loadColorTable(env, NULL, decoder);
break;
}
case STATE_BLOCK_BEGINNING: {
unsigned char blockLabel = *(decoder->inputPtr);
switch(blockLabel) {
case EXTENSION_INTRODUCER:
retval = readExtension(env, decoder, currBlock);
break;
case IMAGE_SEPARATOR:
retval = readImageDescriptor(env, currBlock, decoder);
break;
case GIF_TRAILER:
retval = STATUS_EOF;
break;
}
break;
}
case STATE_STARTING_DECOMPRESSION: {
retval = initDecompression(env, decoder, currBlock);
break;
}
case STATE_DECOMPRESSING: {
if(!decoder->interlace)
retval = decompress(env, currBlock, decoder);
else
retval = decompressInterlaced(env, currBlock, decoder);
break;
}
case STATE_READING_COMMENT: {
retval = readComment(env, decoder);
break;
}
case STATE_SKIPPING_BLOCKS: {
retval = skipData(decoder);
break;
}
default:
// Should never execute this!
break;
}
}
// Copy unconsumed data to the start of the input buffer
if(decoder->bytesInBuffer > 0) {
memmove(decoder->input, decoder->inputPtr, decoder->bytesInBuffer);
}
(*env)->ReleasePrimitiveArrayCritical(env, jInput, decoder->input, 0);
(*env)->SetIntField(
env,
obj,
img_GIF_bytesConsumedID,
bytesInBuffer - decoder->bytesInBuffer
);
if(decoder->stateVars.imageDataStarted) {
if(!decoder->interlace) {
scanlinesDecoded = decoder->pixelsDecoded / decoder->currentWidth -
decoder->oldPixelsDecoded / decoder->currentWidth;
decoder->oldPixelsDecoded = decoder->pixelsDecoded;
} else {
if(retval == STATUS_LINE_COMPLETED && decoder->pass < MAX_PASS) {
scanlinesDecoded = 1;
if(decoder->currScanline >= 0)
(*env)->SetIntField(env, currBlock, img_GIF_gb_currYID, decoder->currScanline);
decoder->scanlineOffset = 0;
} else {
scanlinesDecoded = 0;
}
}
} else {
scanlinesDecoded = 0;
}
if(retval == STATUS_FRAME_COMPLETED) {
decoder->oldPixelsDecoded = decoder->pixelsDecoded = 0;
}
// Free the decoder if decoding is finished
if(retval == STATUS_EOF) {
free(decoder);
decoder = NULL;
}
(*env)->SetLongField(env, obj, img_GIF_hNativeDecoderID, (jlong) ((IDATA)decoder));
return scanlinesDecoded;
}
