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Diffstat (limited to 'src/extension/internal/metafile-inout.cpp')
| -rw-r--r-- | src/extension/internal/metafile-inout.cpp | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/src/extension/internal/metafile-inout.cpp b/src/extension/internal/metafile-inout.cpp new file mode 100644 index 000000000..1d419a6a0 --- /dev/null +++ b/src/extension/internal/metafile-inout.cpp @@ -0,0 +1,211 @@ +/** @file + * @brief Metafile input - common routines + *//* + * Authors: + * David Mathog + * + * Copyright (C) 2013 Authors + * Released under GNU GPL, read the file 'COPYING' for more information + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <cstring> +#include <fstream> +#include <glib.h> +#include <glibmm/miscutils.h> + +#include "display/curve.h" +#include "extension/internal/metafile-inout.h" // picks up PNG +#include "extension/print.h" +#include "path-prefix.h" +#include "sp-gradient.h" +#include "sp-image.h" +#include "sp-linear-gradient.h" +#include "sp-pattern.h" +#include "sp-radial-gradient.h" +#include "style.h" + +namespace Inkscape { +namespace Extension { +namespace Internal { + +Metafile::~Metafile() +{ + return; +} + +/** Construct a PNG in memory from an RGB from the EMF file + +from: +http://www.lemoda.net/c/write-png/ + +which was based on: +http://stackoverflow.com/questions/1821806/how-to-encode-png-to-buffer-using-libpng + +gcc -Wall -o testpng testpng.c -lpng + +Originally here, but moved up + +#include <png.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdint.h> +*/ + + +/* Given "bitmap", this returns the pixel of bitmap at the point + ("x", "y"). */ + +pixel_t * Metafile::pixel_at (bitmap_t * bitmap, int x, int y) +{ + return bitmap->pixels + bitmap->width * y + x; +} + + +/* Write "bitmap" to a PNG file specified by "path"; returns 0 on + success, non-zero on error. */ + +void +Metafile::my_png_write_data(png_structp png_ptr, png_bytep data, png_size_t length) +{ + PMEMPNG p=(PMEMPNG)png_get_io_ptr(png_ptr); + + size_t nsize = p->size + length; + + /* allocate or grow buffer */ + if(p->buffer){ p->buffer = (char *) realloc(p->buffer, nsize); } + else{ p->buffer = (char *) malloc(nsize); } + + if(!p->buffer){ png_error(png_ptr, "Write Error"); } + + /* copy new bytes to end of buffer */ + memcpy(p->buffer + p->size, data, length); + p->size += length; +} + +void Metafile::toPNG(PMEMPNG accum, int width, int height, const char *px){ + bitmap_t bmStore; + bitmap_t *bitmap = &bmStore; + accum->buffer=NULL; // PNG constructed in memory will end up here, caller must free(). + accum->size=0; + bitmap->pixels=(pixel_t *)px; + bitmap->width = width; + bitmap->height = height; + + png_structp png_ptr = NULL; + png_infop info_ptr = NULL; + size_t x, y; + png_byte ** row_pointers = NULL; + /* The following number is set by trial and error only. I cannot + see where it it is documented in the libpng manual. + */ + int pixel_size = 3; + int depth = 8; + + png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + if (png_ptr == NULL){ + accum->buffer=NULL; + return; + } + + info_ptr = png_create_info_struct (png_ptr); + if (info_ptr == NULL){ + png_destroy_write_struct (&png_ptr, &info_ptr); + accum->buffer=NULL; + return; + } + + /* Set up error handling. */ + + if (setjmp (png_jmpbuf (png_ptr))) { + png_destroy_write_struct (&png_ptr, &info_ptr); + accum->buffer=NULL; + return; + } + + /* Set image attributes. */ + + png_set_IHDR ( + png_ptr, + info_ptr, + bitmap->width, + bitmap->height, + depth, + PNG_COLOR_TYPE_RGB, + PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_DEFAULT, + PNG_FILTER_TYPE_DEFAULT + ); + + /* Initialize rows of PNG. */ + + row_pointers = (png_byte **) png_malloc (png_ptr, bitmap->height * sizeof (png_byte *)); + for (y = 0; y < bitmap->height; ++y) { + png_byte *row = + (png_byte *) png_malloc (png_ptr, sizeof (uint8_t) * bitmap->width * pixel_size); + row_pointers[bitmap->height - y - 1] = row; // Row order in EMF is reversed. + for (x = 0; x < bitmap->width; ++x) { + pixel_t * pixel = pixel_at (bitmap, x, y); + *row++ = pixel->red; // R & B channels were set correctly by DIB_to_RGB + *row++ = pixel->green; + *row++ = pixel->blue; + } + } + + /* Write the image data to memory */ + + png_set_rows (png_ptr, info_ptr, row_pointers); + + png_set_write_fn(png_ptr, accum, my_png_write_data, NULL); + + png_write_png (png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL); + + for (y = 0; y < bitmap->height; y++) { + png_free (png_ptr, row_pointers[y]); + } + png_free (png_ptr, row_pointers); + png_destroy_write_struct(&png_ptr, &info_ptr); + +} + + +/* convert an EMF RGB(A) color to 0RGB +inverse of gethexcolor() in emf-print.cpp +*/ +uint32_t Metafile::sethexcolor(U_COLORREF color){ + + uint32_t out; + out = (U_RGBAGetR(color) << 16) + + (U_RGBAGetG(color) << 8 ) + + (U_RGBAGetB(color) ); + return(out); +} + +/* Return the base64 encoded png which is shown for all bad images. +Currently a random 3x4 blotch. +Caller must free. +*/ +gchar *Metafile::bad_image_png(void){ + gchar *gstring = g_strdup("iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAIAAAA7ljmRAAAAA3NCSVQICAjb4U/gAAAALElEQVQImQXBQQ2AMAAAsUJQMSWI2H8qME1yMshojwrvGB8XcHKvR1XtOTc/8HENumHCsOMAAAAASUVORK5CYII="); + return(gstring); +} + + + +} // namespace Internal +} // namespace Extension +} // namespace Inkscape + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 : |