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_webp.c
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_webp.c
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#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "Imaging.h"
#include "py3.h"
#include <webp/encode.h>
#include <webp/decode.h>
#include <webp/types.h>
#ifdef HAVE_WEBPMUX
#include <webp/mux.h>
#endif
PyObject* WebPEncode_wrapper(PyObject* self, PyObject* args)
{
int width;
int height;
int lossless;
float quality_factor;
uint8_t *rgb;
uint8_t *icc_bytes;
uint8_t *exif_bytes;
uint8_t *output;
char *mode;
Py_ssize_t size;
Py_ssize_t icc_size;
Py_ssize_t exif_size;
size_t ret_size;
if (!PyArg_ParseTuple(args, "s#iiifss#s#",
(char**)&rgb, &size, &width, &height, &lossless, &quality_factor, &mode,
&icc_bytes, &icc_size, &exif_bytes, &exif_size)) {
return NULL;
}
if (strcmp(mode, "RGBA")==0){
if (size < width * height * 4){
Py_RETURN_NONE;
}
#if WEBP_ENCODER_ABI_VERSION >= 0x0100
if (lossless) {
ret_size = WebPEncodeLosslessRGBA(rgb, width, height, 4* width, &output);
} else
#endif
{
ret_size = WebPEncodeRGBA(rgb, width, height, 4* width, quality_factor, &output);
}
} else if (strcmp(mode, "RGB")==0){
if (size < width * height * 3){
Py_RETURN_NONE;
}
#if WEBP_ENCODER_ABI_VERSION >= 0x0100
if (lossless) {
ret_size = WebPEncodeLosslessRGB(rgb, width, height, 3* width, &output);
} else
#endif
{
ret_size = WebPEncodeRGB(rgb, width, height, 3* width, quality_factor, &output);
}
} else {
Py_RETURN_NONE;
}
#ifndef HAVE_WEBPMUX
if (ret_size > 0) {
PyObject *ret = PyBytes_FromStringAndSize((char*)output, ret_size);
free(output);
return ret;
}
#else
{
/* I want to truncate the *_size items that get passed into webp
data. Pypy2.1.0 had some issues where the Py_ssize_t items had
data in the upper byte. (Not sure why, it shouldn't have been there)
*/
int i_icc_size = (int)icc_size;
int i_exif_size = (int)exif_size;
WebPData output_data = {0};
WebPData image = { output, ret_size };
WebPData icc_profile = { icc_bytes, i_icc_size };
WebPData exif = { exif_bytes, i_exif_size };
WebPMuxError err;
int dbg = 0;
int copy_data = 0; // value 1 indicates given data WILL be copied to the mux
// and value 0 indicates data will NOT be copied.
WebPMux* mux = WebPMuxNew();
WebPMuxSetImage(mux, &image, copy_data);
if (dbg) {
/* was getting %ld icc_size == 0, icc_size>0 was true */
fprintf(stderr, "icc size %d, %d \n", i_icc_size, i_icc_size > 0);
}
if (i_icc_size > 0) {
if (dbg) {
fprintf (stderr, "Adding ICC Profile\n");
}
err = WebPMuxSetChunk(mux, "ICCP", &icc_profile, copy_data);
if (dbg && err == WEBP_MUX_INVALID_ARGUMENT) {
fprintf(stderr, "Invalid ICC Argument\n");
} else if (dbg && err == WEBP_MUX_MEMORY_ERROR) {
fprintf(stderr, "ICC Memory Error\n");
}
}
if (dbg) {
fprintf(stderr, "exif size %d \n", i_exif_size);
}
if (i_exif_size > 0) {
if (dbg){
fprintf (stderr, "Adding Exif Data\n");
}
err = WebPMuxSetChunk(mux, "EXIF", &exif, copy_data);
if (dbg && err == WEBP_MUX_INVALID_ARGUMENT) {
fprintf(stderr, "Invalid Exif Argument\n");
} else if (dbg && err == WEBP_MUX_MEMORY_ERROR) {
fprintf(stderr, "Exif Memory Error\n");
}
}
WebPMuxAssemble(mux, &output_data);
WebPMuxDelete(mux);
free(output);
ret_size = output_data.size;
if (ret_size > 0) {
PyObject *ret = PyBytes_FromStringAndSize((char*)output_data.bytes, ret_size);
WebPDataClear(&output_data);
return ret;
}
}
#endif
Py_RETURN_NONE;
}
PyObject* WebPDecode_wrapper(PyObject* self, PyObject* args)
{
PyBytesObject *webp_string;
const uint8_t *webp;
Py_ssize_t size;
PyObject *ret = Py_None, *bytes = NULL, *pymode = NULL, *icc_profile = NULL, *exif = NULL;
WebPDecoderConfig config;
VP8StatusCode vp8_status_code = VP8_STATUS_OK;
char* mode = "RGB";
if (!PyArg_ParseTuple(args, "S", &webp_string)) {
return NULL;
}
if (!WebPInitDecoderConfig(&config)) {
Py_RETURN_NONE;
}
PyBytes_AsStringAndSize((PyObject *) webp_string, (char**)&webp, &size);
vp8_status_code = WebPGetFeatures(webp, size, &config.input);
if (vp8_status_code == VP8_STATUS_OK) {
// If we don't set it, we don't get alpha.
// Initialized to MODE_RGB
if (config.input.has_alpha) {
config.output.colorspace = MODE_RGBA;
mode = "RGBA";
}
#ifndef HAVE_WEBPMUX
vp8_status_code = WebPDecode(webp, size, &config);
#else
{
int copy_data = 0;
WebPData data = { webp, size };
WebPMuxFrameInfo image;
WebPData icc_profile_data = {0};
WebPData exif_data = {0};
WebPMux* mux = WebPMuxCreate(&data, copy_data);
if (NULL == mux)
goto end;
if (WEBP_MUX_OK != WebPMuxGetFrame(mux, 1, &image))
{
WebPMuxDelete(mux);
goto end;
}
webp = image.bitstream.bytes;
size = image.bitstream.size;
vp8_status_code = WebPDecode(webp, size, &config);
if (WEBP_MUX_OK == WebPMuxGetChunk(mux, "ICCP", &icc_profile_data))
icc_profile = PyBytes_FromStringAndSize((const char*)icc_profile_data.bytes, icc_profile_data.size);
if (WEBP_MUX_OK == WebPMuxGetChunk(mux, "EXIF", &exif_data))
exif = PyBytes_FromStringAndSize((const char*)exif_data.bytes, exif_data.size);
WebPDataClear(&image.bitstream);
WebPMuxDelete(mux);
}
#endif
}
if (vp8_status_code != VP8_STATUS_OK)
goto end;
if (config.output.colorspace < MODE_YUV) {
bytes = PyBytes_FromStringAndSize((char *)config.output.u.RGBA.rgba,
config.output.u.RGBA.size);
} else {
// Skipping YUV for now. Need Test Images.
// UNDONE -- unclear if we'll ever get here if we set mode_rgb*
bytes = PyBytes_FromStringAndSize((char *)config.output.u.YUVA.y,
config.output.u.YUVA.y_size);
}
#if PY_VERSION_HEX >= 0x03000000
pymode = PyUnicode_FromString(mode);
#else
pymode = PyString_FromString(mode);
#endif
ret = Py_BuildValue("SiiSSS", bytes, config.output.width,
config.output.height, pymode,
NULL == icc_profile ? Py_None : icc_profile,
NULL == exif ? Py_None : exif);
end:
WebPFreeDecBuffer(&config.output);
Py_XDECREF(bytes);
Py_XDECREF(pymode);
Py_XDECREF(icc_profile);
Py_XDECREF(exif);
if (Py_None == ret)
Py_RETURN_NONE;
return ret;
}
// Return the decoder's version number, packed in hexadecimal using 8bits for
// each of major/minor/revision. E.g: v2.5.7 is 0x020507.
PyObject* WebPDecoderVersion_wrapper(PyObject* self, PyObject* args){
return Py_BuildValue("i", WebPGetDecoderVersion());
}
/*
* The version of webp that ships with (0.1.3) Ubuntu 12.04 doesn't handle alpha well.
* Files that are valid with 0.3 are reported as being invalid.
*/
int WebPDecoderBuggyAlpha() {
return WebPGetDecoderVersion()==0x0103;
}
PyObject* WebPDecoderBuggyAlpha_wrapper(PyObject* self, PyObject* args){
return Py_BuildValue("i", WebPDecoderBuggyAlpha());
}
static PyMethodDef webpMethods[] =
{
{"WebPEncode", WebPEncode_wrapper, METH_VARARGS, "WebPEncode"},
{"WebPDecode", WebPDecode_wrapper, METH_VARARGS, "WebPDecode"},
{"WebPDecoderVersion", WebPDecoderVersion_wrapper, METH_VARARGS, "WebPVersion"},
{"WebPDecoderBuggyAlpha", WebPDecoderBuggyAlpha_wrapper, METH_VARARGS, "WebPDecoderBuggyAlpha"},
{NULL, NULL}
};
void addMuxFlagToModule(PyObject* m) {
#ifdef HAVE_WEBPMUX
PyModule_AddObject(m, "HAVE_WEBPMUX", Py_True);
#else
PyModule_AddObject(m, "HAVE_WEBPMUX", Py_False);
#endif
}
void addTransparencyFlagToModule(PyObject* m) {
PyModule_AddObject(m, "HAVE_TRANSPARENCY",
PyBool_FromLong(!WebPDecoderBuggyAlpha()));
}
#if PY_VERSION_HEX >= 0x03000000
PyMODINIT_FUNC
PyInit__webp(void) {
PyObject* m;
static PyModuleDef module_def = {
PyModuleDef_HEAD_INIT,
"_webp", /* m_name */
NULL, /* m_doc */
-1, /* m_size */
webpMethods, /* m_methods */
};
m = PyModule_Create(&module_def);
addMuxFlagToModule(m);
addTransparencyFlagToModule(m);
return m;
}
#else
PyMODINIT_FUNC
init_webp(void)
{
PyObject* m = Py_InitModule("_webp", webpMethods);
addMuxFlagToModule(m);
addTransparencyFlagToModule(m);
}
#endif