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/** Draw PPM pixmap
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/** Draw PPM pixmap
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 *
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 *
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 * @param data Pointer to PPM data
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 * @param data Pointer to PPM data
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 * @param datasz Maximum data size
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 * @param datasz Maximum data size
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 * @param x Coordinate of upper left corner
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 * @param sx Coordinate of upper left corner
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 * @param y Coordinate of upper left corner
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 * @param sy Coordinate of upper left corner
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 * @param maxwidth Maximum allowed width for picture
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 * @param maxwidth Maximum allowed width for picture
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 * @param maxheight Maximum allowed height for picture
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 * @param maxheight Maximum allowed height for picture
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 * @param putpixel Putpixel function used to print bitmap
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 * @param putpixel Putpixel function used to print bitmap
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 */
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 */
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int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx,
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int ppm_draw(unsigned char *data, size_t datasz, unsigned int sx,
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         unsigned int sy,
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         unsigned int sy,
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         unsigned int maxwidth, unsigned int maxheight,
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         unsigned int maxwidth, unsigned int maxheight,
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         putpixel_cb_t putpixel,void *vport)
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         putpixel_cb_t putpixel, void *vport)
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{
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{
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    unsigned int width, height;
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    unsigned int width, height;
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    unsigned int maxcolor;
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    unsigned int maxcolor;
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    int i;
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    int i;
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    void *maxdatap = data + datasz;
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    void *maxdatap = data + datasz;