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backport pdfrenderer changes from master (4.0)

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This commit is contained in:
Zdenko Podobný 2017-05-05 20:10:03 +02:00
parent 71712d1073
commit 90b6f17838
2 changed files with 50 additions and 27 deletions
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70
api/pdfrenderer.cpp
View File

@ -159,7 +159,7 @@ CIDToGIDMap.
OK there is a small problem there, if I use GID 0 then Acrobat gets
upset about it and complains it cannot extract the font. If I set the
CIDToGIDMap so that all the entries are 1 instead, its happy. Totally
CIDToGIDMap so that all the entries are 1 instead, it's happy. Totally
mad......
*/
@ -169,10 +169,15 @@ namespace tesseract {
// Use for PDF object fragments. Must be large enough
// to hold a colormap with 256 colors in the verbose
// PDF representation.
const int kBasicBufSize = 2048;
static const int kBasicBufSize = 2048;
// If the font is 10 pts, nominal character width is 5 pts
const int kCharWidth = 2;
static const int kCharWidth = 2;
// Used for memory allocation. A codepoint must take no more than this
// many bytes, when written in the PDF way. e.g. "<0063>" for the
// letter 'c'
static const int kMaxBytesPerCodepoint = 20;
/**********************************************************************
* PDF Renderer interface implementation
@ -304,6 +309,23 @@ void ClipBaseline(int ppi, int x1, int y1, int x2, int y2,
*line_y1 = *line_y2 = (y1 + y2) / 2;
}
bool CodepointToUtf16be(int code, char utf16[kMaxBytesPerCodepoint]) {
if ((code > 0xD7FF && code < 0xE000) || code > 0x10FFFF) {
tprintf("Dropping invalid codepoint %d\n", code);
return false;
}
if (code < 0x10000) {
snprintf(utf16, kMaxBytesPerCodepoint, "%04X", code);
} else {
int a = code - 0x010000;
int high_surrogate = (0x03FF & (a >> 10)) + 0xD800;
int low_surrogate = (0x03FF & a) + 0xDC00;
snprintf(utf16, kMaxBytesPerCodepoint,
"%04X%04X", high_surrogate, low_surrogate);
}
return true;
}
char* TessPDFRenderer::GetPDFTextObjects(TessBaseAPI* api,
double width, double height) {
STRING pdf_str("");
@ -442,25 +464,13 @@ char* TessPDFRenderer::GetPDFTextObjects(TessBaseAPI* api,
if (grapheme && grapheme[0] != '\0') {
GenericVector<int> unicodes;
UNICHAR::UTF8ToUnicode(grapheme, &unicodes);
char utf16[20];
char utf16[kMaxBytesPerCodepoint];
for (int i = 0; i < unicodes.length(); i++) {
int code = unicodes[i];
// Convert to UTF-16BE https://en.wikipedia.org/wiki/UTF-16
if ((code > 0xD7FF && code < 0xE000) || code > 0x10FFFF) {
tprintf("Dropping invalid codepoint %d\n", code);
continue;
if (CodepointToUtf16be(code, utf16)) {
pdf_word += utf16;
pdf_word_len++;
}
if (code < 0x10000) {
snprintf(utf16, sizeof(utf16), "<%04X>", code);
} else {
int a = code - 0x010000;
int high_surrogate = (0x03FF & (a >> 10)) + 0xD800;
int low_surrogate = (0x03FF & a) + 0xDC00;
snprintf(utf16, sizeof(utf16), "<%04X%04X>",
high_surrogate, low_surrogate);
}
pdf_word += utf16;
pdf_word_len++;
}
}
delete []grapheme;
@ -471,9 +481,9 @@ char* TessPDFRenderer::GetPDFTextObjects(TessBaseAPI* api,
kCharWidth * prec(100.0 * word_length / (fontsize * pdf_word_len));
pdf_str.add_str_double("", h_stretch);
pdf_str += " Tz"; // horizontal stretch
pdf_str += " [ ";
pdf_str += " [ <";
pdf_str += pdf_word; // UTF-16BE representation
pdf_str += " ] TJ"; // show the text
pdf_str += "> ] TJ"; // show the text
}
if (last_word_in_line) {
pdf_str += " \n";
@ -706,7 +716,7 @@ bool TessPDFRenderer::imageToPDFObj(Pix *pix,
if (!filename)
return false;
L_COMP_DATA *cid = NULL;
L_Compressed_Data *cid = NULL;
const int kJpegQuality = 85;
int format, sad;
@ -960,15 +970,27 @@ bool TessPDFRenderer::EndDocumentHandler() {
offsets_.back() += pages_objsize; // manipulation #2
// INFO
STRING utf16_title = "FEFF"; // byte_order_marker
GenericVector<int> unicodes;
UNICHAR::UTF8ToUnicode(title(), &unicodes);
char utf16[kMaxBytesPerCodepoint];
for (int i = 0; i < unicodes.length(); i++) {
int code = unicodes[i];
if (CodepointToUtf16be(code, utf16)) {
utf16_title += utf16;
}
}
char* datestr = l_getFormattedDate();
n = snprintf(buf, sizeof(buf),
"%ld 0 obj\n"
"<<\n"
" /Producer (Tesseract %s)\n"
" /CreationDate (D:%s)\n"
" /Title (%s)"
" /Title <%s>\n"
">>\n"
"endobj\n", obj_, TESSERACT_VERSION_STR, datestr, title());
"endobj\n",
obj_, TESSERACT_VERSION_STR, datestr, utf16_title.c_str());
lept_free(datestr);
if (n >= sizeof(buf)) return false;
AppendPDFObject(buf);

7
api/renderer.h
View File

@ -15,8 +15,8 @@
//
///////////////////////////////////////////////////////////////////////
#ifndef TESSERACT_API_RENDERER_H__
#define TESSERACT_API_RENDERER_H__
#ifndef TESSERACT_API_RENDERER_H_
#define TESSERACT_API_RENDERER_H_
// To avoid collision with other typenames include the ABSOLUTE MINIMUM
// complexity of includes here. Use forward declarations wherever possible
@ -57,6 +57,7 @@ class TESS_API TessResultRenderer {
/**
* Starts a new document with the given title.
* This clears the contents of the output data.
* Title should use UTF-8 encoding.
*/
bool BeginDocument(const char* title);
@ -251,4 +252,4 @@ class TESS_API TessOsdRenderer : public TessResultRenderer {
} // namespace tesseract.
#endif // TESSERACT_API_RENDERER_H__
#endif // TESSERACT_API_RENDERER_H_