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Libsvgtiny ========== http://www.netsurf-browser.org/projects/libsvgtiny/ Libsvgtiny is a library for parsing SVG files for display. The overall idea of the library is to take some SVG as input, and return a list of paths and texts which can be rendered easily. The library does not do the actual rendering. All supported SVG objects, for example circles, lines, and gradient filled shapes, are converted to flat-filled paths or a fragment of text, and all coordinates are converted, transformed etc. to pixels. Libsvgtiny is Licensed under the MIT License, http://opensource.org/licenses/mit-license.php Written by James Bursa <[email protected]>. SVG support ----------- Libsvgtiny is initially aiming to implement SVG Tiny, as defined in http://www.w3.org/TR/SVGMobile/. SVG Tiny elements supported: defs, g, svg, circle, line, path, polygon, polyline, rect, text SVG Tiny elements not yet supported: desc, metadata, title, use, a, switch, ellipse, image, font, font-face, font-face-name, font-face-src, glyph, hkern, missing-glyph, animate, animateColor, animateMotion, animateTransform, mpath, set, foreignObject Additional elements supported: linearGradient, stop Text support is incomplete. The style attribute is supported. Building libsvgtiny ------------------- The library uses the Netsurf core buildsystem which must be available (usually at the same level as the libsvg source) The PREFIX variable can be used to perform builds which do not install to global system paths. You will require the following tools: - a C compiler (some parts of C99 support are required) - gperf following additional libraries are required: - libwapcaplet - libdom To compile libsvgtiny, use the command make To install libsvgtiny into /usr/local, use make install The VARIANT variable allows builds for "release" (the default) and "debug" e.g. make VARIANT=debug Testing libsvgtiny ------------------ The core buildsystem provides a test target which performs basic checks make test For manual testing a svgtiny_display script is available which renders an svg to a bitmap. This script uses the svgtiny_test program to render an SVG to an imagemagic MVG. It requires that ImageMagick convert is installed to convert the MVG into a bitmap. Get an suitable SVG file, for example the tiger svg can be found in the examples directory or downloaded [1] Then use svgtiny_display to parse and render it: ./svgtiny_display tiger.svg ./svgtiny_display tiger.svg 2 The optional 2nd argument is a scale. Using libsvgtiny ---------------- The interface is in the header svgtiny.h #include <svgtiny.h> First create a svgtiny_diagram using svgtiny_create(): struct svgtiny_diagram *diagram; diagram = svgtiny_create(); This will return a pointer to a new diagram, or NULL if there was not enough memory. SVGs are parsed from memory using svgtiny_parse(): svgtiny_code code; code = svgtiny_parse(diagram, buffer, size, url, 1000, 1000); The arguments are the pointer returned by svgtiny_create(), a buffer containing the SVG data, the size of the SVG in bytes, the url that the SVG came from, and the target viewport width and height in pixels. The function returns svgtiny_OK if there were no problems, and diagram is updated. The diagram can then be rendered by looping through the array diagram->shape[0..diagram->shape_count]: for (unsigned int i = 0; i != diagram->shape_count; i++) { Path shapes have a non-NULL path pointer. The path is an array of floats of length path_length. The array contains segment type codes followed by 0 to 3 pairs of coordinates (depending on the segment type): - svgtiny_PATH_MOVE x y - svgtiny_PATH_CLOSE - svgtiny_PATH_LINE x y - svgtiny_PATH_BEZIER x1 y1 x2 y2 x3 y3 A path always starts with a MOVE. The fill and stroke attributes give the colors of the path, or svgtiny_TRANSPARENT if the path is not filled or stroked. Colors are in 0xRRGGBB format (except when compiled for RISC OS). The macros svgtiny_RED, svgtiny_GREEN, and svgtiny_BLUE can be used to extract the components. The width of the path is in stroke_width. Text shapes have a NULL path pointer and a non-NULL text pointer. Text is in UTF-8. The coordinates of the text are in text_x, text_y. Text colors and stroke width are as for paths. If memory runs out during parsing, svgtiny_parse() returns svgtiny_OUT_OF_MEMORY, but the diagram is still valid up to the point when memory was exhausted, and may safely be rendered. If there is an error in the SVG (for example, an element is missing an attribute required by the specification), svgtiny_SVG_ERROR is returned, but the diagram is still valid up to the point of the error. The error is recorded in diagram->error_message and the line that caused it in diagram->error_line. svgtiny_LIBXML_ERROR indicates that parsing the XML failed. The returned diagram will contain no shapes. svgtiny_NOT_SVG means that the XML did not contain a top-level <svg> element. To free memory used by a diagram, use svgtiny_free(): svgtiny_free(diagram); For an example, see svgtiny_test.c. [1] http://upload.wikimedia.org/wikipedia/commons/f/fd/Ghostscript_Tiger.svg
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