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tessbridge.cpp
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tessbridge.cpp
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#if __FreeBSD__ >= 10
#include "/usr/local/include/leptonica/allheaders.h"
#include "/usr/local/include/tesseract/baseapi.h"
#else
#include <leptonica/allheaders.h>
#include <tesseract/baseapi.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include "tessbridge.h"
TessBaseAPI Create() {
tesseract::TessBaseAPI* api = new tesseract::TessBaseAPI();
return (void*)api;
}
void Free(TessBaseAPI a) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
api->End();
delete api;
}
void Clear(TessBaseAPI a) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
api->Clear();
}
void ClearPersistentCache(TessBaseAPI a) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
api->ClearPersistentCache();
}
int Init(TessBaseAPI a, char* tessdataprefix, char* languages) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
return api->Init(tessdataprefix, languages);
}
int Init(TessBaseAPI a, char* tessdataprefix, char* languages, char* configfilepath, char* errbuf) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
// {{{ Redirect STDERR to given buffer
fflush(stderr);
int original_stderr;
original_stderr = dup(STDERR_FILENO);
(void)freopen("/dev/null", "a", stderr);
setbuf(stderr, errbuf);
// }}}
int ret;
if (configfilepath != NULL) {
char* configs[] = {configfilepath};
int configs_size = 1;
ret = api->Init(tessdataprefix, languages, tesseract::OEM_DEFAULT, configs, configs_size, NULL, NULL, false);
} else {
ret = api->Init(tessdataprefix, languages);
}
// {{{ Restore default stderr
(void)freopen("/dev/null", "a", stderr);
dup2(original_stderr, STDERR_FILENO);
setbuf(stderr, NULL);
// }}}
return ret;
}
bool SetVariable(TessBaseAPI a, char* name, char* value) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
return api->SetVariable(name, value);
}
void SetPixImage(TessBaseAPI a, PixImage pix) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
Pix* image = (Pix*)pix;
api->SetImage(image);
if (api->GetSourceYResolution() < 70) {
api->SetSourceResolution(70);
}
}
void SetSourceResolution(TessBaseAPI a, int res) {
tesseract::TessBaseAPI * api = (tesseract::TessBaseAPI*)a;
api->SetSourceResolution(res);
}
void SetPageSegMode(TessBaseAPI a, int m) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
tesseract::PageSegMode mode = (tesseract::PageSegMode)m;
api->SetPageSegMode(mode);
}
int GetPageSegMode(TessBaseAPI a) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
return api->GetPageSegMode();
}
char* UTF8Text(TessBaseAPI a) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
return api->GetUTF8Text();
}
char* HOCRText(TessBaseAPI a) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
return api->GetHOCRText(0);
}
bounding_boxes* GetBoundingBoxesVerbose(TessBaseAPI a) {
using namespace tesseract;
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
struct bounding_boxes* box_array;
box_array = (bounding_boxes*)malloc(sizeof(bounding_boxes));
// linearly resize boxes array
int realloc_threshold = 900;
int realloc_raise = 1000;
int capacity = 1000;
box_array->boxes = (bounding_box*)malloc(capacity * sizeof(bounding_box));
box_array->length = 0;
api->Recognize(NULL);
int block_num = 0;
int par_num = 0;
int line_num = 0;
int word_num = 0;
ResultIterator* res_it = api->GetIterator();
while (!res_it->Empty(RIL_BLOCK)) {
if (res_it->Empty(RIL_WORD)) {
res_it->Next(RIL_WORD);
continue;
}
// Add rows for any new block/paragraph/textline.
if (res_it->IsAtBeginningOf(RIL_BLOCK)) {
block_num++;
par_num = 0;
line_num = 0;
word_num = 0;
}
if (res_it->IsAtBeginningOf(RIL_PARA)) {
par_num++;
line_num = 0;
word_num = 0;
}
if (res_it->IsAtBeginningOf(RIL_TEXTLINE)) {
line_num++;
word_num = 0;
}
word_num++;
if (box_array->length >= realloc_threshold) {
capacity += realloc_raise;
box_array->boxes = (bounding_box*)realloc(box_array->boxes, capacity * sizeof(bounding_box));
realloc_threshold += realloc_raise;
}
box_array->boxes[box_array->length].word = res_it->GetUTF8Text(RIL_WORD);
box_array->boxes[box_array->length].confidence = res_it->Confidence(RIL_WORD);
res_it->BoundingBox(RIL_WORD, &box_array->boxes[box_array->length].x1, &box_array->boxes[box_array->length].y1,
&box_array->boxes[box_array->length].x2, &box_array->boxes[box_array->length].y2);
// block, para, line, word numbers
box_array->boxes[box_array->length].block_num = block_num;
box_array->boxes[box_array->length].par_num = par_num;
box_array->boxes[box_array->length].line_num = line_num;
box_array->boxes[box_array->length].word_num = word_num;
box_array->length++;
res_it->Next(RIL_WORD);
}
return box_array;
}
orient_result* DetectOrientationScript(TessBaseAPI a) {
tesseract::TessBaseAPI * api = (tesseract::TessBaseAPI*)a;
struct orient_result* result;
result = (orient_result*)malloc(sizeof(orient_result));
result->script_name = (char*)malloc(sizeof(char));
result->success = api->DetectOrientationScript(
&result->orient_deg,
&result->orient_conf,
(const char**)&result->script_name,
&result->script_conf);
return result;
}
bounding_boxes* GetBoundingBoxes(TessBaseAPI a, int pageIteratorLevel) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
struct bounding_boxes* box_array;
box_array = (bounding_boxes*)malloc(sizeof(bounding_boxes));
// linearly resize boxes array
int realloc_threshold = 900;
int realloc_raise = 1000;
int capacity = 1000;
box_array->boxes = (bounding_box*)malloc(capacity * sizeof(bounding_box));
box_array->length = 0;
api->Recognize(NULL);
tesseract::ResultIterator* ri = api->GetIterator();
tesseract::PageIteratorLevel level = (tesseract::PageIteratorLevel)pageIteratorLevel;
if (ri != 0) {
do {
if (box_array->length >= realloc_threshold) {
capacity += realloc_raise;
box_array->boxes = (bounding_box*)realloc(box_array->boxes, capacity * sizeof(bounding_box));
realloc_threshold += realloc_raise;
}
box_array->boxes[box_array->length].word = ri->GetUTF8Text(level);
box_array->boxes[box_array->length].confidence = ri->Confidence(level);
ri->BoundingBox(level, &box_array->boxes[box_array->length].x1, &box_array->boxes[box_array->length].y1,
&box_array->boxes[box_array->length].x2, &box_array->boxes[box_array->length].y2);
box_array->length++;
} while (ri->Next(level));
}
return box_array;
}
const char* Version(TessBaseAPI a) {
tesseract::TessBaseAPI* api = (tesseract::TessBaseAPI*)a;
const char* v = api->Version();
return v;
}
PixImage CreatePixImageByFilePath(char* imagepath) {
Pix* image = pixRead(imagepath);
return (void*)image;
}
PixImage CreatePixImageFromBytes(unsigned char* data, int size) {
Pix* image = pixReadMem(data, (size_t)size);
return (void*)image;
}
void DestroyPixImage(PixImage pix) {
Pix* img = (Pix*)pix;
pixDestroy(&img);
}
const char* GetDataPath() {
static tesseract::TessBaseAPI api;
api.Init(nullptr, nullptr);
return api.GetDatapath();
}