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| author | scuri <scuri> | 2008-10-17 06:10:33 +0000 |
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| committer | scuri <scuri> | 2008-10-17 06:10:33 +0000 |
| commit | 7b52cc13af4e85f1ca2deb6b6c77de9c95ea0dcf (patch) | |
| tree | d0857278bde2eff784227c57dcaf930346ceb7ac /html/en/drv/gdiplus.html | |
First commit - moving from LuaForge to SourceForge
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| -rw-r--r-- | html/en/drv/gdiplus.html | 200 |
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diff --git a/html/en/drv/gdiplus.html b/html/en/drv/gdiplus.html new file mode 100644 index 0000000..e4a2810 --- /dev/null +++ b/html/en/drv/gdiplus.html @@ -0,0 +1,200 @@ +<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN"> +<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"> + +<head> +<meta http-equiv="Content-Language" content="en"> +<title>GDI+</title> +<link rel="stylesheet" type="text/css" href="../../style.css"> +</head> + +<body> + +<h2>Microsoft Windows Base <em style="font-style: normal">Driver</em> Using GDI+</h2> + + <p>This driver represents a base driver for all system-dependent drivers implemented in the Microsoft Windows system, + but uses a new API called GDI+. The drivers <b>Clipboard, Native Window</b>, <b>IUP</b>, <b>Image</b>, <b>Printer</b>, + <b>EMF</b> and <b>Double Buffer</b> were implemented. The driver <b>WMF</b>, and the function <font face="Courier"> + <strong>cdPlay</strong></font> of the <b>Clipboard</b> and <b>EMF</b> drivers were not implemented using GDI+.</p> + <p>The main motivation for the use of GDI+ was transparency for all the primitives. Beyond that we got other features + like anti-aliasing, gradient filling, bezier lines and filled cardinal splines.</p> + <p>This driver still does not completely replace the GDI Windows base driver, because GDI+ does not have support for + XOR. Also the applications need to adapt the rendering of text that is slightly different from GDI. It is know that + GDI+ can be slower than GDI in some cases and faster in other cases, Microsoft does not make this clear.</p> + <p>So we let the programmer to choose what to use. We created the function <font face="Courier"><strong> + cdUseContextPlus</strong></font> that allows to activate or to deactivate the use of GDI+ for the available + Windows based drivers. + This function affects only the <font face="Courier"><strong>cdCreateCanvas</strong></font> function call, once created + the canvas will be always a GDI+ canvas. In fact the function affects primary the definitions + <font face="Courier"><strong>CD_NATIVEWINDOW</strong></font>, + <strong><span style="font-family: Courier">CD_IMAGE</span></strong>, <strong> + <span style="font-family: Courier">CD_PRINTER</span></strong>, <strong> + <span style="font-family: Courier">CD_EMF</span></strong>, <strong> + <span style="font-family: Courier">CD_DBUFFER</span></strong> and <strong> + <span style="font-family: Courier">CD_CLIPBOARD</span></strong>, because they are + function calls and not static defines.</p> + <p>Using GDI+ it is allowed to create more that one canvas at the same time for the same Window. And they can co-exist + with a standard GDI canvas.</p> + <p>To enable the use of GDI+ based drivers you must call the initialization function <font face="Courier"><strong> + cdInitContextPlus()</strong></font> once and link to the libraries "<strong>cdcontextplus.lib</strong>" and "<strong>gdiplus.lib</strong>". + Also the file "<strong>gdiplus.dll</strong>" must be available in your system. These files already came with Visual + C++ 7 and Windows XP. For other compilers or systems you will need to copy the ".lib" file for you libraries area, and + you will need to copy the DLL for the Windows\System (Win98/Me) or Windows\System32 (Win2000/NT4-SP6) folder. The + gdiplus files can be obtained from + <a href="http://www.microsoft.com/downloads/details.aspx?familyid=6a63ab9c-df12-4d41-933c-be590feaa05a&displaylang=en"> + Microsoft</a> or from <a href="../../download/gdiplus.zip">here</a>.</p> + <p>In CDLua it is not necessary any additional initialization, but the + application must still be linked with the <strong>cdcontextplus.lib</strong> + library or a <strong>require"cdluacontextplus"</strong> can be used when + using dynamic libraries.</p> + +<h3>Behavior of Functions</h3> +<h4>Control</h4> +<ul> + <li><a href="../func/other.html#cdPlay"><font face="Courier"><strong>Play</strong></font></a>: + does nothing, returns <font face="Courier">CD_ERROR</font>. </li> +</ul> +<h4>Coordinate System and Clipping</h4> +<ul> + <li><a href="../func/coordinates.html#cdUpdateYAxis"><font face="Courier"> + <strong>UpdateYAxis</strong></font></a>: the orientation of axis Y is the opposite to its orientation in the CD + library. Except when using transformations.</li> +</ul> +<h4>Primitives</h4> +<ul> + <li><font face="Courier"><strong><a href="../func/marks.html#cdPixel">Pixel</a></strong></font>: + uses GDI. Excepting when the canvas is an image so it is done using GDI+.</li> + <li><font face="Courier"><a href="../func/filled.html#cdSector"><b>Sector</b></a></font>: + it also draws an arc in the same position to complete the size of the sector.</li> + <li><font face="Courier"><a href="../func/text.html#cdText"><b>Text</b></a></font>: + opaque text is simulated using a rectangle in the back.</li> + <li><a href="../func/lines.html#cdBegin"><font face="Courier"><strong>Begin</strong></font></a>: + Beyond the standard modes it accepts the additional modes: <strong><tt>CD_FILLSPLINE</tt></strong> and <strong><tt> + CD_FILLGRADIENT</tt></strong>. The C definitions of these modes are available in the <b>cdgdiplus.h</b> header.<br> + <strong><tt><br> + CD_SPLINE</tt></strong> defines the points of a curve constructed by a cardinal spline. Uses the current line style.<br> + <strong><tt>CD_FILLSPLINE</tt></strong> defines the points of a filled curve constructed by a cardinal spline. Uses + the current interior style.<br> + <strong><tt>CD_FILLGRADIENT</tt></strong> defines the points of a filled polygon. It is filled with a gradient from + colors in each vertex to a color in its center. The colors are defined by the "<strong><tt>GRADIENTCOLOR</tt></strong>" + attribute, that must be set before each <strong><tt>cdVertex</tt></strong> call and before <strong><tt>cdEnd</tt></strong> + for the center color. This will not affect the current interior style.</li> +</ul> +<h4>Attributes </h4> +<ul> + <li><a href="../func/filled.html#cdBackOpacity"><font face="Courier"><strong> + BackOpacity</strong></font></a>: only changes the transparency of the background color to 0 (transparent) or 255 + (opaque).</li> + <li><a href="../func/filled.html#cdHatch"><font face="Courier"><strong>Hatch</strong></font></a>: + diagonal styles are drawn with anti-aliasing.</li> + <li><a href="../func/attributes.html#cdWriteMode"><font face="Courier"> + <strong> + WriteMode</strong></font></a>: does nothing. There is no support for XOR or NOT_XOR.</li> + <li><a href="../func/filled.html#cdPattern"><font face="Courier"><strong> + Pattern</strong></font></a>: each pixel can contain transparency information.</li> + <li><font face="Courier"><strong><a href="../func/lines.html#cdLineStyle"> + LineStyle</a></strong></font>: uses a custom GDI+ style when line width is 1. In World Coordinates the line style + has its scaled changed.</li> + <li><a href="../func/text.html#cdFontDim"><font face="Courier"><strong>FontDim</strong></font></a>: + the maximum width is estimated from the character "W".</li> + <li><font face="Courier"><strong><a href="../func/text.html#cdTextAlignment"> + TextAlignment</a></strong></font>: is simulated. Although GDI+ has text alignment, the results + do not match the CD text alignment.</li> + <li><a href="../func/text.html#cdNativeFont"><font face="Courier"><strong> + NativeFont</strong></font></a>: also accepts <em><strong>"-d"</strong></em><strong> + </strong> to show the font-selection dialog box.</li> + <li><a href="../func/text.html#cdFont"><font face="Courier"><strong>Font</strong></font></a>: + "System" is mapped to "MS Sans Serif", "Courier" is mapped to "Courier New", + "Helvetica" is mapped to "Arial", and "Times" is mapped to "Times New Roman". + Underline and Strikeout are supported.</li> +</ul> +<h4>Colors </h4> +<ul> + <li><a href="../func/color.html#cdPalette"><font face="Courier"><strong>Palette</strong></font></a>: + works only when the canvas is a server image.</li> + <li><a href="../func/attributes.html#cdForeground"><font face="Courier"> + <strong> + Foreground</strong></font></a> & + <a href="../func/attributes.html#cdBackground"> + <font face="Courier"><strong>Background</strong></font></a>: accepts the transparency information encoded in the + color.</li> +</ul> +<h4>Client Images </h4> +<ul> + <li><a href="../func/client.html#cdGetImageRGB"><font face="Courier"><strong> + GetImageRGB</strong></font></a>: uses GDI. Excepting when the canvas is an image so it is done using GDI+.</li> +</ul> +<h4>Server Images </h4> +<ul> + <li><strong><a href="../func/server.html#cdGetImage">GetImage</a></strong>: + uses GDI. Excepting when the canvas is an image so it is done using GDI+.</li> + <li><strong><a href="../func/server.html#cdScrollArea">ScrollArea</a></strong>: + uses GDI. Excepting when the canvas is an image so it is done using GDI+.</li> +</ul> +<h4>Exclusive Attributes</h4> +<ul> + <li>"<span style="font-family: Courier"><strong>GDI+</strong></span>": + returns "1". So the application can detect if the driver uses the GDI+ base + driver. Other drivers that do not implement this attribute will return NULL.</li> +</ul> +<ul> + <li>"<b><font face="Courier">HDC</font></b>": returns the HDC of the Win32 canvas. It can only be retrieved (get + only). In Lua is returned as a user data. It is not NULL only in some Native Windows canvas and in the printer canvas.</li> +</ul> +<ul> + <li>"<b><font face="Courier">ANTIALIAS</font></b>": controls the use of anti-aliasing + for the text, image zoom and line + drawing primitives. Assumes values "1" (active) and "0" (inactive). Default value: "1". </li> +</ul> +<ul> + <li>"<b><font face="Courier">GRADIENTCOLOR</font></b>": necessary for the creation of the gradient fill defined by a + polygon (see details in the function <font face="Courier"><strong>cdBegin</strong></font> above). Defines the color of + each vertex and the center (%d %d %d" = r g b). It can not be retrieved (set only).</li> +</ul> +<ul> + <li>"<b><font face="Courier">IMAGETRANSP</font></b>": defines an interval of colors to be considered transparent in + client and server images (except for RGBA images). It uses two colors to define the interval ("%d %d %d %d %d %d" = r1 + g1 b1 r2 g3 b3). Use NULL to remove the attribute. </li> +</ul> +<ul> + <li>"<b><font face="Courier">IMAGEFORMAT</font></b>": defines the number of bits per pixel used to create server + images. It uses 1 integer that can have the values: "32" or "24" (%d). Use NULL to remove the attribute. It is used + only in the <font face="Courier"><strong>cdCreateImage</strong></font>. When not defined, the server images use the + same format of the canvas.</li> +</ul> +<ul> + <li>"<strong><font face="Courier">IMAGEALPHA</font></strong>": allows the usage of an alpha channel for server + images if IMAGEFORMAT=32. The attribute format is a pointer to the transparency values in a sequence of chars in + the same format of alpha for client images. The attribute is used in the <strong> + <font face="Courier">cdCreateImage</font></strong> and for every <font face="Courier"><strong> + cdPutImageRect</strong></font>, the pointer must exists while the image exists. The alpha values are transfered to + the image only in <font face="Courier"><strong>cdPutImageRect</strong></font>, so they can be freely changed any time. + The data is not duplicated, only the pointer is stored. The size of the data must be the same size of the image. Use + NULL to remove the attribute. Not accessible in Lua.</li> +</ul> +<ul> + <li>"<b><font face="Courier">IMAGEPOINTS</font></b>": define 3 coordinates of a paralelogram that will be used + to warp server and client images in the subsequent calls of <font face="Courier"><strong>PutImage</strong></font> + functions. Use 6 integer values inside a string ("%d %d %d %d %d %d" = x1 y1 x2 y2 x3 y3). Use NULL to remove the + attribute. The destination rectangle of the <font face="Courier"><strong>PutImage</strong></font> functions will be + ignored. The respective specified points are the upper-left corner, the upper-right corner and the lower left corner. + In GDI+ this attribute is more complete than in GDI, because affects also client images.</li> +</ul> +<ul> + <li>"<b><font face="Courier">ROTATE</font></b>": allows the usage of 1 angle and 1 coordinate (x, y), that + define a global rotation transformation centered in the specified coordinate. Use 1 real and 2 integer values inside a + string ("%g %d %d" = angle x y).</li> +</ul> +<ul> + <li><b><font face="Courier">"LINEGRADIENT": </font></b>defines a filled interior style that uses a line gradient + between two colors. It uses 2 points ("%d %d %d %d" = x1 y1 x2 y2), one for the starting point using (using the + foreground color), and another one for the end point (using the background color).</li> +</ul> +<ul> + <li><b><font face="Courier">"LINECAP": </font></b>defines addicional line cap styles. It can have the following + values: "Triangle", "NoAnchor", "SquareAnchor", "RoundAnchor", "DiamondAnchor", or "ArrowAnchor". It can not be + retrieved (set only).</li> +</ul> + +</body> + +</html>
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