Cairo 2D graphics library build 2024-04-02 alpha

[UEZ]

Quote

Cairo is a 2D graphics library with support for multiple output devices. Currently supported output targets include the X Window System (via both Xlib and XCB), Quartz, Win32, image buffers, PostScript, PDF, and SVG file output.

Cairo is designed to produce consistent output on all output media while taking advantage of display hardware acceleration when available (eg. through the X Render Extension).

The cairo API provides operations similar to the drawing operators of PostScript and PDF. Operations in cairo including stroking and filling cubic Bézier splines, transforming and compositing translucent images, and antialiased text rendering. All drawing operations can be transformed by any affine transformation (scale, rotation, shear, etc.)

Cairo is implemented as a library written in the C programming language, but bindings are available for several different programming languages.

Cairo is free software and is available to be redistributed and/or modified under the terms of either the GNU Lesser General Public License (LGPL) version 2.1 or the Mozilla Public License (MPL) version 1.1 at your option.

I ported half of the Cairo functions to Autoit. You can read more about the functions here: https://www.cairographics.org/documentation/

The probability is high that errors have crept in and I have only tested a fraction of the functions.

 

Anyone who wants to can contribute examples.

 

All needed files (DLLs, UDF and examples) can be download from my OneDrive: Cairo for Autoit

 

If you find a mistake, I am sure you will, then please report it.

Edited April 4 by UEZ

[Andreik]

Can you write an example using a PDF surface?

[UEZ]

The functions are added but the created PDF is currently empty. When I found a way to create working PDFs I will post it.

[UEZ]

This seems to work but you need libcairo-2.dll which can be found also on my OneDrive (x86 / x64 folders).

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;Coded by UEZ build 2024-04-02 beta
#AutoIt3Wrapper_UseX64=n

#include "..\Cairo.au3"

Cairo_Example()

Func Cairo_Example()
    If Not Cairo_Init("libcairo-2.dll") Then
        ConsoleWrite(@error & @CRLF)
        Exit
    EndIf
    If FileExists("Example.pdf") Then FileDelete("Example.pdf")

    Local $MM_TO_PT = 72.0 / 25.4, $PAGE_WIDTH_A5 = 148, $PAGE_HEIGHT_A5 = 210, $PAGE_WIDTH_A4 = 210, $PAGE_HEIGHT_A4 = 297
    Local Const $pSurface = Cairo_PDF_Create("Example.pdf", $PAGE_WIDTH_A5 * $MM_TO_PT, $PAGE_HEIGHT_A5 * $MM_TO_PT)
    Cairo_PDF_RestrictToVersion($pSurface, $CAIRO_PDF_VERSION_1_4)
    Local Const $pContext = Cairo_Context_Create($pSurface)
    Cairo_Context_SetLineWidth($pContext, 6)
    Cairo_Context_PathAddRectangle($pContext, 12, 12, 232,70)
    Cairo_Context_PathBeginNewSub($pContext)
    Cairo_Context_PathAddArc($pContext, 64, 64, 40, 0, ACos(-1) * 2)
    Cairo_Context_PathBeginNewSub($pContext)
    Cairo_Context_PathAddArcNegative($pContext, 192, 64, 40, 0, -ACos(-1) * 2)

    Cairo_Context_SetFillRule($pContext, $CAIRO_FILL_RULE_EVEN_ODD)
    Cairo_Context_SetSourceRGB($pContext, 0, 0.7, 0)
    Cairo_Context_FillPreserve($pContext)
    Cairo_Context_SetSourceRGB($pContext, 0, 0, 0)
    Cairo_Context_Stroke($pContext)

    Cairo_Context_Translate($pContext, 0, 128)
    Cairo_Context_PathAddRectangle($pContext, 12, 12, 232,70)
    Cairo_Context_PathBeginNewSub($pContext)
    Cairo_Context_PathAddArc($pContext, 64, 64, 40, 0, ACos(-1) * 2)
    Cairo_Context_PathBeginNewSub($pContext)
    Cairo_Context_PathAddArcNegative($pContext, 192, 64, 40, 0, -ACos(-1) * 2)

    Cairo_Context_SetFillRule($pContext, $CAIRO_FILL_RULE_WINDING)
    Cairo_SetColor($pContext, 0, 0, 0.9)
    Cairo_Context_FillPreserve($pContext)
    Cairo_SetColor($pContext, 0, 0, 0)
    Cairo_Context_Stroke($pContext)

    Cairo_Context_PathClear($pContext)
    Cairo_Context_PathAddMoveTo($pContext, 40, 150)
    Cairo_Font_SelectFace($pContext)
    Cairo_Font_SetSize($pContext, 30)
    Cairo_Context_PathAddText($pContext, "PDF Example")
    Cairo_SetColor($pContext, 0.9, 0, 0, 1)
    Cairo_Context_FillPreserve($pContext)
    Cairo_SetColor($pContext, 0, 0, 0.1, 0.5)
    Cairo_Context_SetLineWidth($pContext, 1.5)
    Cairo_Context_Stroke($pContext)

    Cairo_Surface_Finish($pSurface)
    Cairo_Surface_Flush($pSurface)
    
    ConsoleWrite(Cairo_Surface_GetStatus($pSurface) & @CRLF)
    Cairo_Context_Destroy($pContext)
    Cairo_Surface_Destroy($pSurface)
    Cairo_Close()
    ConsoleWrite(FileGetSize("Example.pdf") & @CRLF)
EndFunc

 

I seems that the Cairo.dll / Cairo64.dll doesn't work properly with PDF creation...

Edited April 2, 2024 by UEZ