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pdfextrimgs.cpp
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pdfextrimgs.cpp
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#include "galapdf.h"
#include "pdfutil.h"
#include <stdio.h>
#include <GfxState.h>
#include <OutputDev.h>
#include <Error.h>
class image_extractor: public OutputDev
{
public:
image_extractor(char* target_p, GBool dump_jpeg_p, char* format_p,
int jpg_quality_p, GBool tiff_jpeg_p)
{
strcpy(file_base, target_p);
// check output format
strcpy(format, format_p);
if (!strcmp(format, "jpg"))
fif = FIF_JPEG;
else if (!strcmp(format, "png"))
fif = FIF_PNG;
else if (!strcmp(format, "gif"))
fif = FIF_GIF;
else if (!strcmp(format, "tif"))
fif = FIF_TIFF;
else
{
fif = FIF_BMP;
strcpy(format, "bmp");
}
// check jpeg quality
jpg_quality = jpg_quality_p;
if (jpg_quality <= 0 || jpg_quality > 100)
jpg_quality = 75;
dump_jpeg = dump_jpeg_p;
tiff_jpeg = tiff_jpeg_p;
img_num = 0;
}
virtual ~image_extractor()
{
}
virtual int get_image_number()
{
return img_num;
}
int getImageNum() { return img_num; }
virtual GBool isOk() { return gTrue; }
virtual GBool interpretType3Chars() { return gFalse; }
virtual GBool needNonText() { return gTrue; }
virtual GBool upsideDown() { return gTrue; }
virtual GBool useDrawChar() { return gFalse; }
void save_stream_to_file(Stream* str, char* file_name)
{
FILE *f;
if (!(f = fopen(file_name, "wb")))
{
error(-1, "Couldn't create file '%s'", file_name);
return;
}
str = ((DCTStream *)str)->getRawStream();
str->reset();
int c;
while ((c = str->getChar()) != EOF)
fputc(c, f);
str->close();
fclose(f);
}
void save_stream_to_image(Stream* str, GfxImageColorMap* color_map,
int width, int height, GBool mono,
char* file_name, GBool mask)
{
// read raw data from memory
FIBITMAP* fib;
if (mono)
{
int size = height * ((width + 7) / 8);
unsigned char* buf = (unsigned char*)malloc(size);
if (!buf) return;
unsigned char* p = buf;
str->reset();
for (int i = 0; i < size; i++)
*p++ = str->getChar();
str->close();
fib = FreeImage_ConvertFromRawBits(buf, width, height,
(width + 7) / 8, 1, 0, 0, 0, 1);
RGBQUAD* pal = FreeImage_GetPalette(fib);
pal[0].rgbRed = pal[0].rgbGreen = pal[0].rgbBlue = (mask ? 0 : 255);
pal[1].rgbRed = pal[1].rgbGreen = pal[1].rgbBlue = (mask ? 255 : 0);
free(buf);
}
else
{
int row_size = width * 3;
if (row_size % 4)
row_size += (4 - row_size % 4);
unsigned char* buf = (unsigned char*)malloc(height * row_size);
if (!buf) return;
ImageStream* img_str =
new ImageStream(str, width, color_map->getNumPixelComps(),
color_map->getBits());
img_str->reset();
Guchar* p;
unsigned char* pbuf;
GfxRGB rgb;
for (int y = 0; y < height; ++y)
{
p = img_str->getLine();
pbuf = buf + row_size * y;
for (int x = 0; x < width; ++x)
{
color_map->getRGB(p, &rgb);
pbuf[0] = colToByte(rgb.b);
pbuf[1] = colToByte(rgb.g);
pbuf[2] = colToByte(rgb.r);
p += color_map->getNumPixelComps();
pbuf += 3;
}
}
fib = FreeImage_ConvertFromRawBits(buf, width, height, row_size,
24, 0, 0, 0, 1);
delete img_str;
free(buf);
}
// adjust color depth
if (fif == FIF_GIF && !mono)
{
FIBITMAP* fib_temp = fib;
fib = FreeImage_ColorQuantize(fib_temp, FIQ_WUQUANT);
FreeImage_Unload(fib_temp);
}
else if (fif == FIF_JPEG && mono)
{
FIBITMAP* fib_temp = fib;
fib = FreeImage_ConvertTo8Bits(fib_temp);
FreeImage_Unload(fib_temp);
}
// save
FreeImage_SetDotsPerMeterX(fib, 72 * 10000 / 254);
FreeImage_SetDotsPerMeterY(fib, 72 * 10000 / 254);
int flag = 0;
if (fif == FIF_JPEG) flag = jpg_quality;
else if (fif == FIF_TIFF && tiff_jpeg && !mono) flag = TIFF_JPEG;
if (!FreeImage_Save(fif, fib, file_name, flag))
error(-1, "Couldn't create file '%s'", file_name);
FreeImage_Unload(fib);
}
void save_stream_to_alpha_image(Stream* str, GfxImageColorMap* colorMap,
int width, int height, Stream* maskStr,
GfxImageColorMap* maskColorMap,
int maskWidth, int maskHeight,
char* file_name)
{
if (fif != FIF_PNG ||
width == 0 || height == 0 || maskWidth == 0 || maskHeight == 0)
{
save_stream_to_image(str, colorMap, width, height,
colorMap->getNumPixelComps() == 1 &&
colorMap->getBits() == 1,
file_name, gFalse);
return;
}
// allocate buffer
int row_size = width * 4;
unsigned char* buf = (unsigned char*)malloc(height * row_size);
if (!buf) return;
// read mask data
ImageStream* mask_str =
new ImageStream(maskStr, maskWidth,
maskColorMap->getNumPixelComps(),
maskColorMap->getBits());
mask_str->reset();
Guchar* mask_line = mask_str->getLine();
int old_mask_row = 0;
for (int y = 0; y < height; ++y)
{
unsigned char* pbuf = buf + row_size * y;
int new_mask_row = y * maskHeight / height;
for (int i = old_mask_row; i < new_mask_row; ++i)
{
mask_line = mask_str->getLine();
}
old_mask_row = new_mask_row;
int old_mask_column = 0;
for (int x = 0; x < width; ++x)
{
int new_mask_column = x * maskWidth / width;
mask_line += maskColorMap->getNumPixelComps() *
(new_mask_column - old_mask_column);
old_mask_column = new_mask_column;
GfxGray gray;
maskColorMap->getGray(mask_line, &gray);
pbuf[3] = colToByte(gray);
pbuf += 4;
}
}
delete mask_str;
// read image data
ImageStream* img_str =
new ImageStream(str, width, colorMap->getNumPixelComps(),
colorMap->getBits());
img_str->reset();
for (int y = 0; y < height; ++y)
{
unsigned char* pbuf = buf + row_size * y;
Guchar* line = img_str->getLine();
for (int x = 0; x < width; ++x)
{
GfxRGB rgb;
colorMap->getRGB(line, &rgb);
// int alpha = pbuf[3];
// if (alpha < 255 && alpha > 0)
// {
// pbuf[0] = (colToByte(rgb.b) + alpha - 255) * 255 / alpha;
// pbuf[1] = (colToByte(rgb.g) + alpha - 255) * 255 / alpha;
// pbuf[2] = (colToByte(rgb.r) + alpha - 255) * 255 / alpha;
// }
// else
{
pbuf[0] = colToByte(rgb.b);
pbuf[1] = colToByte(rgb.g);
pbuf[2] = colToByte(rgb.r);
}
line += colorMap->getNumPixelComps();
pbuf += 4;
}
}
delete img_str;
// create image
FIBITMAP* fib = FreeImage_ConvertFromRawBits(buf, width, height,
row_size, 32, 0, 0, 0, 1);
free(buf);
// save
FreeImage_SetDotsPerMeterX(fib, 72 * 10000 / 254);
FreeImage_SetDotsPerMeterY(fib, 72 * 10000 / 254);
int flag = 0;
if (fif == FIF_JPEG) flag = jpg_quality;
else if (fif == FIF_TIFF && tiff_jpeg) flag = TIFF_JPEG;
if (!FreeImage_Save(fif, fib, file_name, flag))
error(-1, "Couldn't create file '%s'", file_name);
FreeImage_Unload(fib);
}
virtual void drawImageMask(GfxState *state, Object *ref, Stream *str,
int width, int height, GBool invert,
GBool inlineImg)
{
// dump jpeg
if (dump_jpeg && str->getKind() == strDCT && !inlineImg)
{
sprintf(file_name, "%s%05d.jpg", file_base, ++img_num);
save_stream_to_file(str, file_name);
}
// dump pbm
else
{
sprintf(file_name, "%s%05d.%s", file_base, ++img_num, format);
save_stream_to_image(str, NULL, width, height, gTrue, file_name,
gTrue);
}
}
virtual void drawImage(GfxState *state, Object *ref, Stream *str,
int width, int height, GfxImageColorMap *colorMap,
int *maskColors, GBool inlineImg)
{
// dump jpeg
if (dump_jpeg && str->getKind() == strDCT &&
(colorMap->getNumPixelComps() == 1 ||
colorMap->getNumPixelComps() == 3) &&
!inlineImg)
{
sprintf(file_name, "%s%05d.jpg", file_base, ++img_num);
save_stream_to_file(str, file_name);
}
// dump pbm
else if (colorMap->getNumPixelComps() == 1 && colorMap->getBits() == 1)
{
sprintf(file_name, "%s%05d.%s", file_base, ++img_num, format);
save_stream_to_image(str, NULL, width, height, gTrue, file_name,
gFalse);
}
// dump ppm
else
{
sprintf(file_name, "%s%05d.%s", file_base, ++img_num, format);
save_stream_to_image(str, colorMap, width, height, gFalse,
file_name, gFalse);
}
}
virtual void drawSoftMaskedImage(GfxState *state, Object *ref,
Stream *str, int width, int height,
GfxImageColorMap *colorMap,
Stream *maskStr, int maskWidth,
int maskHeight,
GfxImageColorMap *maskColorMap)
{
sprintf(file_name, "%s%05d.%s", file_base, ++img_num, format);
save_stream_to_alpha_image(str, colorMap, width, height,
maskStr, maskColorMap, maskWidth, maskHeight,
file_name);
}
private:
char file_base[1024];
char file_name[1024];
GBool dump_jpeg;
int img_num;
FREE_IMAGE_FORMAT fif;
char format[16];
int jpg_quality;
GBool tiff_jpeg;
};
int extract_images_from_pdf(char* filename,
char* target,
char* owner_password,
char* user_password,
char* range,
char* format,
int jpg_quality,
GBool dump_jpg,
GBool tiff_jpg)
{
if (user_cancelled)
return gpret_user_cancelled;
// load config
xpdf_rc xrc;
// open file
xpdf_doc xdoc(filename, owner_password, user_password);
PDFDoc* doc = xdoc.get_doc();
if (!doc->isOk())
return doc->getErrorCode() == errEncrypted ?
gpret_pdf_encrypted :
gpret_cant_open_pdf;
// check for copy permission
// if (!doc->okToCopy())
// return gpret_dont_allow_copy;
// get page range
page_range range_list(range);
if (*range == '\0')
{
range_list.add_item(range_item(1, doc->getNumPages()));
}
if (user_cancelled)
return gpret_user_cancelled;
// write image files
fi_loader fi;
int progress = 0;
image_extractor img_out(target, dump_jpg, format, jpg_quality, tiff_jpg);
for (int i = 0; i < range_list.item_count(); i++)
{
range_item& item = range_list.get_item(i);
for (int pg = item.first;
pg <= min(item.last, doc->getNumPages());
pg++)
{
if (user_cancelled)
return gpret_user_cancelled;
doc->displayPage(&img_out, pg, 72, 72, 0, gFalse, gTrue, gFalse);
printf("progress: %d\n",
++progress * 100 / range_list.page_count());
}
}
printf("image count: %d\n", img_out.get_image_number());
return gpret_success;
}