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Merge branch 'pcx' of https://github.com/wiredfool/Pillow into wiredfool-pcx

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This commit is contained in:
Alex Clark 2014-03-17 09:38:38 -04:00
commit c1d44980b8
6 changed files with 252 additions and 177 deletions
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2
CHANGES.rst
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@ -8,6 +8,8 @@ Changelog (Pillow)
[wiredfool] [wiredfool]
- Skip CFFI test earlier if it's not installed - Skip CFFI test earlier if it's not installed
- Fixed opening and saving odd sized .pcx files, fixes #523
[wiredfool] [wiredfool]
- Fixed saving mode P image as a PNG with transparency = palette color 0 - Fixed saving mode P image as a PNG with transparency = palette color 0

20
PIL/PcxImagePlugin.py
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@ -55,12 +55,18 @@ class PcxImageFile(ImageFile.ImageFile):
bbox = i16(s,4), i16(s,6), i16(s,8)+1, i16(s,10)+1 bbox = i16(s,4), i16(s,6), i16(s,8)+1, i16(s,10)+1
if bbox[2] <= bbox[0] or bbox[3] <= bbox[1]: if bbox[2] <= bbox[0] or bbox[3] <= bbox[1]:
raise SyntaxError("bad PCX image size") raise SyntaxError("bad PCX image size")
if Image.DEBUG:
print ("BBox: %s %s %s %s" % bbox)
# format # format
version = i8(s[1]) version = i8(s[1])
bits = i8(s[3]) bits = i8(s[3])
planes = i8(s[65]) planes = i8(s[65])
stride = i16(s,66) stride = i16(s,66)
if Image.DEBUG:
print ("PCX version %s, bits %s, planes %s, stride %s" %
(version, bits, planes, stride))
self.info["dpi"] = i16(s,12), i16(s,14) self.info["dpi"] = i16(s,12), i16(s,14)
@ -98,7 +104,9 @@ class PcxImageFile(ImageFile.ImageFile):
self.size = bbox[2]-bbox[0], bbox[3]-bbox[1] self.size = bbox[2]-bbox[0], bbox[3]-bbox[1]
bbox = (0, 0) + self.size bbox = (0, 0) + self.size
if Image.DEBUG:
print ("size: %sx%s" % self.size)
self.tile = [("pcx", bbox, self.fp.tell(), (rawmode, planes * stride))] self.tile = [("pcx", bbox, self.fp.tell(), (rawmode, planes * stride))]
# -------------------------------------------------------------------- # --------------------------------------------------------------------
@ -126,6 +134,16 @@ def _save(im, fp, filename, check=0):
# bytes per plane # bytes per plane
stride = (im.size[0] * bits + 7) // 8 stride = (im.size[0] * bits + 7) // 8
# stride should be even
stride = stride + (stride % 2)
# Stride needs to be kept in sync with the PcxEncode.c version.
# Ideally it should be passed in in the state, but the bytes value
# gets overwritten.
if Image.DEBUG:
print ("PcxImagePlugin._save: xwidth: %d, bits: %d, stride: %d" % (
im.size[0], bits, stride))
# under windows, we could determine the current screen size with # under windows, we could determine the current screen size with
# "Image.core.display_mode()[1]", but I think that's overkill... # "Image.core.display_mode()[1]", but I think that's overkill...

43
Tests/test_file_pcx.py
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@ -2,29 +2,30 @@ from tester import *
from PIL import Image from PIL import Image
def _roundtrip(im):
f = tempfile("temp.pcx")
im.save(f)
im2 = Image.open(f)
assert_equal(im2.mode, im.mode)
assert_equal(im2.size, im.size)
assert_equal(im2.format, "PCX")
assert_image_equal(im2, im)
def test_sanity(): def test_sanity():
for mode in ('1', 'L', 'P', 'RGB'):
_roundtrip(lena(mode))
file = tempfile("temp.pcx") def test_odd():
# see issue #523, odd sized images should have a stride that's even.
lena("1").save(file) # not that imagemagick or gimp write pcx that way.
# we were not handling properly.
im = Image.open(file) for mode in ('1', 'L', 'P', 'RGB'):
im.load() # larger, odd sized images are better here to ensure that
assert_equal(im.mode, "1") # we handle interrupted scan lines properly.
assert_equal(im.size, (128, 128)) _roundtrip(lena(mode).resize((511,511)))
assert_equal(im.format, "PCX")
lena("1").save(file)
im = Image.open(file)
lena("L").save(file)
im = Image.open(file)
lena("P").save(file)
im = Image.open(file)
lena("RGB").save(file)
im = Image.open(file)
def test_pil184(): def test_pil184():
# Check reading of files where xmin/xmax is not zero. # Check reading of files where xmin/xmax is not zero.

191
encode.c
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@ -33,13 +33,13 @@
#endif #endif
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* Common */ /* Common */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
typedef struct { typedef struct {
PyObject_HEAD PyObject_HEAD
int (*encode)(Imaging im, ImagingCodecState state, int (*encode)(Imaging im, ImagingCodecState state,
UINT8* buffer, int bytes); UINT8* buffer, int bytes);
struct ImagingCodecStateInstance state; struct ImagingCodecStateInstance state;
Imaging im; Imaging im;
PyObject* lock; PyObject* lock;
@ -58,21 +58,21 @@ PyImaging_EncoderNew(int contextsize)
encoder = PyObject_New(ImagingEncoderObject, &ImagingEncoderType); encoder = PyObject_New(ImagingEncoderObject, &ImagingEncoderType);
if (encoder == NULL) if (encoder == NULL)
return NULL; return NULL;
/* Clear the encoder state */ /* Clear the encoder state */
memset(&encoder->state, 0, sizeof(encoder->state)); memset(&encoder->state, 0, sizeof(encoder->state));
/* Allocate encoder context */ /* Allocate encoder context */
if (contextsize > 0) { if (contextsize > 0) {
context = (void*) calloc(1, contextsize); context = (void*) calloc(1, contextsize);
if (!context) { if (!context) {
Py_DECREF(encoder); Py_DECREF(encoder);
(void) PyErr_NoMemory(); (void) PyErr_NoMemory();
return NULL; return NULL;
} }
} else } else
context = 0; context = 0;
/* Initialize encoder context */ /* Initialize encoder context */
encoder->state.context = context; encoder->state.context = context;
@ -105,14 +105,14 @@ _encode(ImagingEncoderObject* encoder, PyObject* args)
int bufsize = 16384; int bufsize = 16384;
if (!PyArg_ParseTuple(args, "|i", &bufsize)) if (!PyArg_ParseTuple(args, "|i", &bufsize))
return NULL; return NULL;
buf = PyBytes_FromStringAndSize(NULL, bufsize); buf = PyBytes_FromStringAndSize(NULL, bufsize);
if (!buf) if (!buf)
return NULL; return NULL;
status = encoder->encode(encoder->im, &encoder->state, status = encoder->encode(encoder->im, &encoder->state,
(UINT8*) PyBytes_AsString(buf), bufsize); (UINT8*) PyBytes_AsString(buf), bufsize);
/* adjust string length to avoid slicing in encoder */ /* adjust string length to avoid slicing in encoder */
if (_PyBytes_Resize(&buf, (status > 0) ? status : 0) < 0) if (_PyBytes_Resize(&buf, (status > 0) ? status : 0) < 0)
@ -138,28 +138,28 @@ _encode_to_file(ImagingEncoderObject* encoder, PyObject* args)
int bufsize = 16384; int bufsize = 16384;
if (!PyArg_ParseTuple(args, "i|i", &fh, &bufsize)) if (!PyArg_ParseTuple(args, "i|i", &fh, &bufsize))
return NULL; return NULL;
/* Allocate an encoder buffer */ /* Allocate an encoder buffer */
buf = (UINT8*) malloc(bufsize); buf = (UINT8*) malloc(bufsize);
if (!buf) if (!buf)
return PyErr_NoMemory(); return PyErr_NoMemory();
ImagingSectionEnter(&cookie); ImagingSectionEnter(&cookie);
do { do {
/* This replaces the inner loop in the ImageFile _save /* This replaces the inner loop in the ImageFile _save
function. */ function. */
status = encoder->encode(encoder->im, &encoder->state, buf, bufsize); status = encoder->encode(encoder->im, &encoder->state, buf, bufsize);
if (status > 0) if (status > 0)
if (write(fh, buf, status) < 0) { if (write(fh, buf, status) < 0) {
ImagingSectionLeave(&cookie); ImagingSectionLeave(&cookie);
free(buf); free(buf);
return PyErr_SetFromErrno(PyExc_IOError); return PyErr_SetFromErrno(PyExc_IOError);
} }
} while (encoder->state.errcode == 0); } while (encoder->state.errcode == 0);
@ -186,39 +186,39 @@ _setimage(ImagingEncoderObject* encoder, PyObject* args)
/* FIXME: should publish the ImagingType descriptor */ /* FIXME: should publish the ImagingType descriptor */
if (!PyArg_ParseTuple(args, "O|(iiii)", &op, &x0, &y0, &x1, &y1)) if (!PyArg_ParseTuple(args, "O|(iiii)", &op, &x0, &y0, &x1, &y1))
return NULL; return NULL;
im = PyImaging_AsImaging(op); im = PyImaging_AsImaging(op);
if (!im) if (!im)
return NULL; return NULL;
encoder->im = im; encoder->im = im;
state = &encoder->state; state = &encoder->state;
if (x0 == 0 && x1 == 0) { if (x0 == 0 && x1 == 0) {
state->xsize = im->xsize; state->xsize = im->xsize;
state->ysize = im->ysize; state->ysize = im->ysize;
} else { } else {
state->xoff = x0; state->xoff = x0;
state->yoff = y0; state->yoff = y0;
state->xsize = x1 - x0; state->xsize = x1 - x0;
state->ysize = y1 - y0; state->ysize = y1 - y0;
} }
if (state->xsize <= 0 || if (state->xsize <= 0 ||
state->xsize + state->xoff > im->xsize || state->xsize + state->xoff > im->xsize ||
state->ysize <= 0 || state->ysize <= 0 ||
state->ysize + state->yoff > im->ysize) { state->ysize + state->yoff > im->ysize) {
PyErr_SetString(PyExc_SystemError, "tile cannot extend outside image"); PyErr_SetString(PyExc_SystemError, "tile cannot extend outside image");
return NULL; return NULL;
} }
/* Allocate memory buffer (if bits field is set) */ /* Allocate memory buffer (if bits field is set) */
if (state->bits > 0) { if (state->bits > 0) {
state->bytes = (state->bits * state->xsize+7)/8; state->bytes = (state->bits * state->xsize+7)/8;
state->buffer = (UINT8*) malloc(state->bytes); state->buffer = (UINT8*) malloc(state->bytes);
if (!state->buffer) if (!state->buffer)
return PyErr_NoMemory(); return PyErr_NoMemory();
} }
/* Keep a reference to the image object, to make sure it doesn't /* Keep a reference to the image object, to make sure it doesn't
@ -239,13 +239,13 @@ static struct PyMethodDef methods[] = {
}; };
static PyTypeObject ImagingEncoderType = { static PyTypeObject ImagingEncoderType = {
PyVarObject_HEAD_INIT(NULL, 0) PyVarObject_HEAD_INIT(NULL, 0)
"ImagingEncoder", /*tp_name*/ "ImagingEncoder", /*tp_name*/
sizeof(ImagingEncoderObject), /*tp_size*/ sizeof(ImagingEncoderObject), /*tp_size*/
0, /*tp_itemsize*/ 0, /*tp_itemsize*/
/* methods */ /* methods */
(destructor)_dealloc, /*tp_dealloc*/ (destructor)_dealloc, /*tp_dealloc*/
0, /*tp_print*/ 0, /*tp_print*/
0, /*tp_getattr*/ 0, /*tp_getattr*/
0, /*tp_setattr*/ 0, /*tp_setattr*/
0, /*tp_compare*/ 0, /*tp_compare*/
@ -283,9 +283,9 @@ get_packer(ImagingEncoderObject* encoder, const char* mode,
pack = ImagingFindPacker(mode, rawmode, &bits); pack = ImagingFindPacker(mode, rawmode, &bits);
if (!pack) { if (!pack) {
Py_DECREF(encoder); Py_DECREF(encoder);
PyErr_SetString(PyExc_SystemError, "unknown raw mode"); PyErr_SetString(PyExc_SystemError, "unknown raw mode");
return -1; return -1;
} }
encoder->state.shuffle = pack; encoder->state.shuffle = pack;
@ -296,7 +296,7 @@ get_packer(ImagingEncoderObject* encoder, const char* mode,
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* EPS */ /* EPS */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
PyObject* PyObject*
@ -306,7 +306,7 @@ PyImaging_EpsEncoderNew(PyObject* self, PyObject* args)
encoder = PyImaging_EncoderNew(0); encoder = PyImaging_EncoderNew(0);
if (encoder == NULL) if (encoder == NULL)
return NULL; return NULL;
encoder->encode = ImagingEpsEncode; encoder->encode = ImagingEpsEncode;
@ -315,7 +315,7 @@ PyImaging_EpsEncoderNew(PyObject* self, PyObject* args)
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* GIF */ /* GIF */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
PyObject* PyObject*
@ -328,14 +328,14 @@ PyImaging_GifEncoderNew(PyObject* self, PyObject* args)
int bits = 8; int bits = 8;
int interlace = 0; int interlace = 0;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &bits, &interlace)) if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &bits, &interlace))
return NULL; return NULL;
encoder = PyImaging_EncoderNew(sizeof(GIFENCODERSTATE)); encoder = PyImaging_EncoderNew(sizeof(GIFENCODERSTATE));
if (encoder == NULL) if (encoder == NULL)
return NULL; return NULL;
if (get_packer(encoder, mode, rawmode) < 0) if (get_packer(encoder, mode, rawmode) < 0)
return NULL; return NULL;
encoder->encode = ImagingGifEncode; encoder->encode = ImagingGifEncode;
@ -347,7 +347,7 @@ PyImaging_GifEncoderNew(PyObject* self, PyObject* args)
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* PCX */ /* PCX */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
PyObject* PyObject*
@ -358,15 +358,19 @@ PyImaging_PcxEncoderNew(PyObject* self, PyObject* args)
char *mode; char *mode;
char *rawmode; char *rawmode;
int bits = 8; int bits = 8;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &bits))
return NULL; if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &bits)) {
return NULL;
}
encoder = PyImaging_EncoderNew(0); encoder = PyImaging_EncoderNew(0);
if (encoder == NULL) if (encoder == NULL) {
return NULL; return NULL;
}
if (get_packer(encoder, mode, rawmode) < 0) if (get_packer(encoder, mode, rawmode) < 0) {
return NULL; return NULL;
}
encoder->encode = ImagingPcxEncode; encoder->encode = ImagingPcxEncode;
@ -375,7 +379,7 @@ PyImaging_PcxEncoderNew(PyObject* self, PyObject* args)
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* RAW */ /* RAW */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
PyObject* PyObject*
@ -389,14 +393,14 @@ PyImaging_RawEncoderNew(PyObject* self, PyObject* args)
int ystep = 1; int ystep = 1;
if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &stride, &ystep)) if (!PyArg_ParseTuple(args, "ss|ii", &mode, &rawmode, &stride, &ystep))
return NULL; return NULL;
encoder = PyImaging_EncoderNew(0); encoder = PyImaging_EncoderNew(0);
if (encoder == NULL) if (encoder == NULL)
return NULL; return NULL;
if (get_packer(encoder, mode, rawmode) < 0) if (get_packer(encoder, mode, rawmode) < 0)
return NULL; return NULL;
encoder->encode = ImagingRawEncode; encoder->encode = ImagingRawEncode;
@ -408,7 +412,7 @@ PyImaging_RawEncoderNew(PyObject* self, PyObject* args)
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* XBM */ /* XBM */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
PyObject* PyObject*
@ -418,10 +422,10 @@ PyImaging_XbmEncoderNew(PyObject* self, PyObject* args)
encoder = PyImaging_EncoderNew(0); encoder = PyImaging_EncoderNew(0);
if (encoder == NULL) if (encoder == NULL)
return NULL; return NULL;
if (get_packer(encoder, "1", "1;R") < 0) if (get_packer(encoder, "1", "1;R") < 0)
return NULL; return NULL;
encoder->encode = ImagingXbmEncode; encoder->encode = ImagingXbmEncode;
@ -430,7 +434,7 @@ PyImaging_XbmEncoderNew(PyObject* self, PyObject* args)
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* ZIP */ /* ZIP */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
#ifdef HAVE_LIBZ #ifdef HAVE_LIBZ
@ -469,16 +473,16 @@ PyImaging_ZipEncoderNew(PyObject* self, PyObject* args)
encoder = PyImaging_EncoderNew(sizeof(ZIPSTATE)); encoder = PyImaging_EncoderNew(sizeof(ZIPSTATE));
if (encoder == NULL) if (encoder == NULL)
return NULL; return NULL;
if (get_packer(encoder, mode, rawmode) < 0) if (get_packer(encoder, mode, rawmode) < 0)
return NULL; return NULL;
encoder->encode = ImagingZipEncode; encoder->encode = ImagingZipEncode;
if (rawmode[0] == 'P') if (rawmode[0] == 'P')
/* disable filtering */ /* disable filtering */
((ZIPSTATE*)encoder->state.context)->mode = ZIP_PNG_PALETTE; ((ZIPSTATE*)encoder->state.context)->mode = ZIP_PNG_PALETTE;
((ZIPSTATE*)encoder->state.context)->optimize = optimize; ((ZIPSTATE*)encoder->state.context)->optimize = optimize;
((ZIPSTATE*)encoder->state.context)->compress_level = compress_level; ((ZIPSTATE*)encoder->state.context)->compress_level = compress_level;
@ -492,7 +496,7 @@ PyImaging_ZipEncoderNew(PyObject* self, PyObject* args)
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
/* JPEG */ /* JPEG */
/* -------------------------------------------------------------------- */ /* -------------------------------------------------------------------- */
#ifdef HAVE_LIBJPEG #ifdef HAVE_LIBJPEG
@ -500,15 +504,15 @@ PyImaging_ZipEncoderNew(PyObject* self, PyObject* args)
/* We better define this encoder last in this file, so the following /* We better define this encoder last in this file, so the following
undef's won't mess things up for the Imaging library proper. */ undef's won't mess things up for the Imaging library proper. */
#undef HAVE_PROTOTYPES #undef HAVE_PROTOTYPES
#undef HAVE_STDDEF_H #undef HAVE_STDDEF_H
#undef HAVE_STDLIB_H #undef HAVE_STDLIB_H
#undef UINT8 #undef UINT8
#undef UINT16 #undef UINT16
#undef UINT32 #undef UINT32
#undef INT8 #undef INT8
#undef INT16 #undef INT16
#undef INT32 #undef INT32
#include "Jpeg.h" #include "Jpeg.h"
@ -601,14 +605,14 @@ PyImaging_JpegEncoderNew(PyObject* self, PyObject* args)
&progressive, &smooth, &optimize, &streamtype, &progressive, &smooth, &optimize, &streamtype,
&xdpi, &ydpi, &subsampling, &qtables, &extra, &extra_size, &xdpi, &ydpi, &subsampling, &qtables, &extra, &extra_size,
&rawExif, &rawExifLen)) &rawExif, &rawExifLen))
return NULL; return NULL;
encoder = PyImaging_EncoderNew(sizeof(JPEGENCODERSTATE)); encoder = PyImaging_EncoderNew(sizeof(JPEGENCODERSTATE));
if (encoder == NULL) if (encoder == NULL)
return NULL; return NULL;
if (get_packer(encoder, mode, rawmode) < 0) if (get_packer(encoder, mode, rawmode) < 0)
return NULL; return NULL;
qarrays = get_qtables_arrays(qtables); qarrays = get_qtables_arrays(qtables);
@ -718,11 +722,11 @@ PyImaging_LibTiffEncoderNew(PyObject* self, PyObject* args)
return NULL; return NULL;
} }
// While failes on 64 bit machines, complains that pos is an int instead of a Py_ssize_t // While failes on 64 bit machines, complains that pos is an int instead of a Py_ssize_t
// while (PyDict_Next(dir, &pos, &key, &value)) { // while (PyDict_Next(dir, &pos, &key, &value)) {
for (pos=0;pos<d_size;pos++){ for (pos=0;pos<d_size;pos++){
key = PyList_GetItem(keys,pos); key = PyList_GetItem(keys,pos);
value = PyList_GetItem(values,pos); value = PyList_GetItem(values,pos);
status = 0; status = 0;
TRACE(("Attempting to set key: %d\n", (int)PyInt_AsLong(key))); TRACE(("Attempting to set key: %d\n", (int)PyInt_AsLong(key)));
if (PyInt_Check(value)) { if (PyInt_Check(value)) {
@ -793,3 +797,4 @@ PyImaging_LibTiffEncoderNew(PyObject* self, PyObject* args)
#endif #endif

11
libImaging/PcxDecode.c
View File

@ -57,7 +57,16 @@ ImagingPcxDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
} }
if (state->x >= state->bytes) { if (state->x >= state->bytes) {
if (state->bytes % state->xsize && state->bytes > state->xsize) {
int bands = state->bytes / state->xsize;
int stride = state->bytes / bands;
int i;
for (i=1; i< bands; i++) { // note -- skipping first band
memmove(&state->buffer[i*state->xsize],
&state->buffer[i*stride],
state->xsize);
}
}
/* Got a full line, unpack it */ /* Got a full line, unpack it */
state->shuffle((UINT8*) im->image[state->y + state->yoff] + state->shuffle((UINT8*) im->image[state->y + state->yoff] +
state->xoff * im->pixelsize, state->buffer, state->xoff * im->pixelsize, state->buffer,

162
libImaging/PcxEncode.c
View File

@ -5,7 +5,7 @@
* encoder for PCX data * encoder for PCX data
* *
* history: * history:
* 99-02-07 fl created * 99-02-07 fl created
* *
* Copyright (c) Fredrik Lundh 1999. * Copyright (c) Fredrik Lundh 1999.
* Copyright (c) Secret Labs AB 1999. * Copyright (c) Secret Labs AB 1999.
@ -26,23 +26,41 @@ ImagingPcxEncode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
{ {
UINT8* ptr; UINT8* ptr;
int this; int this;
int bytes_per_line = 0;
int padding = 0;
int stride = 0;
int bpp = 0;
int planes = 1;
int i;
ptr = buf; ptr = buf;
if (!state->state) { if (!state->state) {
/* sanity check */ /* sanity check */
if (state->xsize <= 0 || state->ysize <= 0) { if (state->xsize <= 0 || state->ysize <= 0) {
state->errcode = IMAGING_CODEC_END; state->errcode = IMAGING_CODEC_END;
return 0; return 0;
} }
state->bytes = (state->xsize*state->bits + 7) / 8;
state->state = FETCH; state->state = FETCH;
} }
for (;;) bpp = state->bits;
if (state->bits == 24){
planes = 3;
bpp = 8;
}
bytes_per_line = (state->xsize*bpp + 7) / 8;
/* The stride here needs to be kept in sync with the version in
PcxImagePlugin.py. If it's not, the header and the body of the
image will be out of sync and bad things will happen on decode.
*/
stride = bytes_per_line + (bytes_per_line % 2);
padding = stride - bytes_per_line;
for (;;) {
switch (state->state) { switch (state->state) {
case FETCH: case FETCH:
@ -68,81 +86,103 @@ ImagingPcxEncode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
/* fall through */ /* fall through */
case ENCODE: case ENCODE:
/* compress this line */ /* compress this line */
/* when we arrive here, "count" contains the number of /* when we arrive here, "count" contains the number of
bytes having the value of "LAST" that we've already bytes having the value of "LAST" that we've already
seen */ seen */
while (state->x < planes * bytes_per_line) {
/* If we're encoding an odd width file, and we've
got more than one plane, we need to pad each
color row with padding bytes at the end. Since
The pixels are stored RRRRRGGGGGBBBBB, so we need
to have the padding be RRRRRPGGGGGPBBBBBP. Hence
the double loop
*/
while (state->x % bytes_per_line) {
while (state->x < state->bytes) { if (state->count == 63) {
/* this run is full; flush it */
if (state->count == 63) { if (bytes < 2)
/* this run is full; flush it */
if (bytes < 2)
return ptr - buf;
*ptr++ = 0xff;
*ptr++ = state->LAST;
bytes -= 2;
state->count = 0;
}
this = state->buffer[state->x];
if (this == state->LAST) {
/* extend the current run */
state->x++;
state->count++;
} else {
/* start a new run */
if (state->count == 1 && (state->LAST < 0xc0)) {
if (bytes < 1)
return ptr - buf; return ptr - buf;
*ptr++ = 0xff;
*ptr++ = state->LAST; *ptr++ = state->LAST;
bytes--; bytes -= 2;
} else {
if (state->count > 0) { state->count = 0;
if (bytes < 2)
return ptr - buf;
*ptr++ = 0xc0 | state->count;
*ptr++ = state->LAST;
bytes -= 2;
}
} }
state->LAST = this; this = state->buffer[state->x];
state->count = 1;
state->x++; if (this == state->LAST) {
/* extend the current run */
state->x++;
state->count++;
} else {
/* start a new run */
if (state->count == 1 && (state->LAST < 0xc0)) {
if (bytes < 1) {
return ptr - buf;
}
*ptr++ = state->LAST;
bytes--;
} else {
if (state->count > 0) {
if (bytes < 2) {
return ptr - buf;
}
*ptr++ = 0xc0 | state->count;
*ptr++ = state->LAST;
bytes -= 2;
}
}
state->LAST = this;
state->count = 1;
state->x++;
}
} }
}
/* end of line; flush the current run */ /* end of line; flush the current run */
if (state->count == 1 && (state->LAST < 0xc0)) { if (state->count == 1 && (state->LAST < 0xc0)) {
if (bytes < 1) if (bytes < 1 + padding) {
return ptr - buf;
*ptr++ = state->LAST;
bytes--;
} else {
if (state->count > 0) {
if (bytes < 2)
return ptr - buf; return ptr - buf;
*ptr++ = 0xc0 | state->count; }
*ptr++ = state->LAST; *ptr++ = state->LAST;
bytes -= 2; bytes--;
} else {
if (state->count > 0) {
if (bytes < 2 + padding) {
return ptr - buf;
}
*ptr++ = 0xc0 | state->count;
*ptr++ = state->LAST;
bytes -= 2;
}
}
if (bytes < padding) {
return ptr - buf;
}
/* add the padding */
for (i=0;i<padding;i++){
*ptr++=0;
bytes--;
}
/* reset for the next color plane. */
if (state->x < planes * bytes_per_line) {
state->count = 1;
state->LAST = state->buffer[state->x];
state->x++;
} }
} }
/* read next line */ /* read next line */
state->state = FETCH; state->state = FETCH;
break; break;
} }
}
} }