mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2024-12-26 05:18:21 +01:00
Doco updates.
This commit is contained in:
Michael R Sweet
parent
2c8a996875
commit
d4e3bbcf16
72
doc/pdfio.md
72
doc/pdfio.md
@ -465,7 +465,9 @@ You create a new PDF file using the [`pdfioFileCreate`](@@) function:
|
||||
pdfio_rect_t media_box = { 0.0, 0.0, 612.0, 792.0 }; // US Letter
|
||||
pdfio_rect_t crop_box = { 36.0, 36.0, 576.0, 756.0 }; // w/0.5" margins
|
||||
|
||||
pdfio_file_t *pdf = pdfioFileCreate("myoutputfile.pdf", "2.0", &media_box, &crop_box, error_cb, error_data);
|
||||
pdfio_file_t *pdf = pdfioFileCreate("myoutputfile.pdf", "2.0",
|
||||
&media_box, &crop_box,
|
||||
error_cb, error_data);
|
||||
```
|
||||
|
||||
where the six arguments to the function are the filename ("myoutputfile.pdf"),
|
||||
@ -481,7 +483,9 @@ function:
|
||||
pdfio_rect_t media_box = { 0.0, 0.0, 612.0, 792.0 }; // US Letter
|
||||
pdfio_rect_t crop_box = { 36.0, 36.0, 576.0, 756.0 }; // w/0.5" margins
|
||||
|
||||
pdfio_file_t *pdf = pdfioFileCreateOutput(output_cb, output_ctx, "2.0", &media_box, &crop_box, error_cb, error_data);
|
||||
pdfio_file_t *pdf = pdfioFileCreateOutput(output_cb, output_ctx, "2.0",
|
||||
&media_box, &crop_box,
|
||||
error_cb, error_data);
|
||||
```
|
||||
|
||||
Once the file is created, use the [`pdfioFileCreateObj`](@@),
|
||||
@ -638,13 +642,16 @@ spaces:
|
||||
pdfio_file_t *pdf = pdfioFileCreate(...);
|
||||
|
||||
// Create an AdobeRGB color array
|
||||
pdfio_array_t *adobe_rgb = pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_ADOBE);
|
||||
pdfio_array_t *adobe_rgb =
|
||||
pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_ADOBE);
|
||||
|
||||
// Create an Display P3 color array
|
||||
pdfio_array_t *display_p3 = pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_P3_D65);
|
||||
pdfio_array_t *display_p3 =
|
||||
pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_P3_D65);
|
||||
|
||||
// Create an sRGB color array
|
||||
pdfio_array_t *srgb = pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_SRGB);
|
||||
pdfio_array_t *srgb =
|
||||
pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_SRGB);
|
||||
```
|
||||
|
||||
|
||||
@ -670,6 +677,7 @@ font object for one of the base PDF fonts:
|
||||
- "Times-Roman"
|
||||
- "ZapfDingbats"
|
||||
|
||||
Except for Symbol and ZapfDingbats (which use a custom 8-bit character set),
|
||||
PDFio always uses the Windows CP1252 subset of Unicode for these fonts.
|
||||
|
||||
The second function is [`pdfioFileCreateFontObjFromFile`](@@) which creates a
|
||||
@ -677,7 +685,8 @@ font object from a TrueType/OpenType font file, for example:
|
||||
|
||||
```c
|
||||
pdfio_file_t *pdf = pdfioFileCreate(...);
|
||||
pdfio_obj_t *arial = pdfioFileCreateFontObjFromFile(pdf, "OpenSans-Regular.ttf", false);
|
||||
pdfio_obj_t *arial =
|
||||
pdfioFileCreateFontObjFromFile(pdf, "OpenSans-Regular.ttf", false);
|
||||
```
|
||||
|
||||
will embed an OpenSans Regular TrueType font using the Windows CP1252 subset of
|
||||
@ -686,12 +695,16 @@ instead, for example:
|
||||
|
||||
```c
|
||||
pdfio_file_t *pdf = pdfioFileCreate(...);
|
||||
pdfio_obj_t *arial = pdfioFileCreateFontObjFromFile(pdf, "NotoSansJP-Regular.otf", true);
|
||||
pdfio_obj_t *arial =
|
||||
pdfioFileCreateFontObjFromFile(pdf, "NotoSansJP-Regular.otf", true);
|
||||
```
|
||||
|
||||
will embed the NotoSansJP Regular OpenType font with full support for Unicode.
|
||||
|
||||
> Note: Not all fonts support Unicode.
|
||||
> Note: Not all fonts support Unicode, and most do not contain a full
|
||||
> complement of Unicode characters. `pdfioFileCreateFontObjFromFile` does not
|
||||
> perform any character subsetting, so the entire font file is embedded in the
|
||||
> PDF file.
|
||||
|
||||
|
||||
### Image Object Functions
|
||||
@ -705,7 +718,11 @@ in memory, for example:
|
||||
```c
|
||||
pdfio_file_t *pdf = pdfioFileCreate(...);
|
||||
unsigned char data[1024 * 1024 * 4]; // 1024x1024 RGBA image data
|
||||
pdfio_obj_t *img = pdfioFileCreateImageObjFromData(pdf, data, /*width*/1024, /*height*/1024, /*num_colors*/3, /*color_data*/NULL, /*alpha*/true, /*interpolate*/false);
|
||||
pdfio_obj_t *img =
|
||||
pdfioFileCreateImageObjFromData(pdf, data, /*width*/1024,
|
||||
/*height*/1024, /*num_colors*/3,
|
||||
/*color_data*/NULL, /*alpha*/true,
|
||||
/*interpolate*/false);
|
||||
```
|
||||
|
||||
will create an object for a 1024x1024 RGBA image in memory, using the default
|
||||
@ -717,11 +734,19 @@ example:
|
||||
pdfio_file_t *pdf = pdfioFileCreate(...);
|
||||
|
||||
// Create an AdobeRGB color array
|
||||
pdfio_array_t *adobe_rgb = pdfioArrayCreateColorFromMatrix(pdf, 3, pdfioAdobeRGBGamma, pdfioAdobeRGBMatrix, pdfioAdobeRGBWhitePoint);
|
||||
pdfio_array_t *adobe_rgb =
|
||||
pdfioArrayCreateColorFromMatrix(pdf, 3, pdfioAdobeRGBGamma,
|
||||
pdfioAdobeRGBMatrix,
|
||||
pdfioAdobeRGBWhitePoint);
|
||||
|
||||
// Create a 1024x1024 RGBA image using AdobeRGB
|
||||
unsigned char data[1024 * 1024 * 4]; // 1024x1024 RGBA image data
|
||||
pdfio_obj_t *img = pdfioFileCreateImageObjFromData(pdf, data, /*width*/1024, /*height*/1024, /*num_colors*/3, /*color_data*/adobe_rgb, /*alpha*/true, /*interpolate*/false);
|
||||
pdfio_obj_t *img =
|
||||
pdfioFileCreateImageObjFromData(pdf, data, /*width*/1024,
|
||||
/*height*/1024, /*num_colors*/3,
|
||||
/*color_data*/adobe_rgb,
|
||||
/*alpha*/true,
|
||||
/*interpolate*/false);
|
||||
```
|
||||
|
||||
The "interpolate" argument specifies whether the colors in the image should be
|
||||
@ -733,7 +758,9 @@ function to copy the image into a PDF image object, for example:
|
||||
|
||||
```c
|
||||
pdfio_file_t *pdf = pdfioFileCreate(...);
|
||||
pdfio_obj_t *img = pdfioFileCreateImageObjFromFile(pdf, "myphoto.jpg", /*interpolate*/true);
|
||||
pdfio_obj_t *img =
|
||||
pdfioFileCreateImageObjFromFile(pdf, "myphoto.jpg",
|
||||
/*interpolate*/true);
|
||||
```
|
||||
|
||||
|
||||
@ -856,7 +883,9 @@ show_pdf_info(const char *filename)
|
||||
|
||||
|
||||
// Open the PDF file with the default callbacks...
|
||||
pdf = pdfioFileOpen(filename, /*password_cb*/NULL, /*password_cbdata*/NULL, /*error_cb*/NULL, /*error_cbdata*/NULL);
|
||||
pdf = pdfioFileOpen(filename, /*password_cb*/NULL,
|
||||
/*password_cbdata*/NULL, /*error_cb*/NULL,
|
||||
/*error_cbdata*/NULL);
|
||||
if (pdf == NULL)
|
||||
return;
|
||||
|
||||
@ -892,7 +921,8 @@ the page with the text centered below:
|
||||
|
||||
|
||||
void
|
||||
create_pdf_image_file(const char *pdfname, const char *imagename, const char *caption)
|
||||
create_pdf_image_file(const char *pdfname, const char *imagename,
|
||||
const char *caption)
|
||||
{
|
||||
pdfio_file_t *pdf;
|
||||
pdfio_obj_t *font;
|
||||
@ -905,7 +935,9 @@ create_pdf_image_file(const char *pdfname, const char *imagename, const char *ca
|
||||
|
||||
|
||||
// Create the PDF file...
|
||||
pdf = pdfioFileCreate(pdfname, /*version*/NULL, /*media_box*/NULL, /*crop_box*/NULL, /*error_cb*/NULL, /*error_cbdata*/NULL);
|
||||
pdf = pdfioFileCreate(pdfname, /*version*/NULL, /*media_box*/NULL,
|
||||
/*crop_box*/NULL, /*error_cb*/NULL,
|
||||
/*error_cbdata*/NULL);
|
||||
|
||||
// Create a Courier base font for the caption
|
||||
font = pdfioFileCreateFontObjFromBase(pdf, "Courier");
|
||||
@ -925,9 +957,9 @@ create_pdf_image_file(const char *pdfname, const char *imagename, const char *ca
|
||||
width = pdfioImageGetWidth(image);
|
||||
height = pdfioImageGetHeight(image);
|
||||
|
||||
// Default media_box is "universal" 595.28x792 points (8.27x11in or 210x279mm)
|
||||
// Use margins of 36 points (0.5in or 12.7mm) with another 36 points for the
|
||||
// caption underneath...
|
||||
// Default media_box is "universal" 595.28x792 points (8.27x11in or
|
||||
// 210x279mm). Use margins of 36 points (0.5in or 12.7mm) with another
|
||||
// 36 points for the caption underneath...
|
||||
swidth = 595.28 - 72.0;
|
||||
sheight = swidth * height / width;
|
||||
if (sheight > (792.0 - 36.0 - 72.0))
|
||||
@ -944,8 +976,8 @@ create_pdf_image_file(const char *pdfname, const char *imagename, const char *ca
|
||||
// Draw the caption in black...
|
||||
pdfioContentSetFillColorDeviceGray(page, 0.0);
|
||||
|
||||
// Compute the starting point for the text - Courier is monospaced with a
|
||||
// nominal width of 0.6 times the text height...
|
||||
// Compute the starting point for the text - Courier is monospaced
|
||||
// with a nominal width of 0.6 times the text height...
|
||||
tx = 0.5 * (595.28 - 18.0 * 0.6 * strlen(caption));
|
||||
|
||||
// Position and draw the caption underneath...
|
||||
|
||||
Loading…
Reference in New Issue
Block a user