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/*
* File: svg.c
*
* Copyright (C) 2024 Rodrigo Arias Mallo <rodarima@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*/
#include <config.h>
#ifdef ENABLE_SVG
#include <stdlib.h> /* For abort() */
#include "msg.h"
#include "image.hh"
#include "cache.h"
#include "dicache.h"
#define NANOSVG_ALL_COLOR_KEYWORDS
#define NANOSVG_IMPLEMENTATION
#include "nanosvg.h"
#define NANOSVGRAST_IMPLEMENTATION
#include "nanosvgrast.h"
typedef struct {
DilloImage *Image; /* Image meta data */
DilloUrl *url; /* Primary Key for the dicache */
int version; /* Secondary Key for the dicache */
int bgcolor; /* Parent widget background color */
int fgcolor; /* Parent widget foreground color */
} DilloSvg;
/*
* Free up the resources for this image.
*/
static void Svg_free(DilloSvg *svg)
{
_MSG("Svg_free: svg=%p\n", svg);
dFree(svg);
}
/*
* Finish the decoding process (and free the memory)
*/
static void Svg_close(DilloSvg *svg, CacheClient_t *Client)
{
_MSG("Svg_close\n");
/* Let dicache know decoding is over */
a_Dicache_close(svg->url, svg->version, Client);
Svg_free(svg);
}
/*
* Receive and process new chunks of SVG image data
*/
static void Svg_write(DilloSvg *svg, void *Buf, uint_t BufSize)
{
static NSVGrasterizer *rasterizer = NULL;
if (!rasterizer)
rasterizer = nsvgCreateRasterizer();
if (Buf == NULL || BufSize <= 0)
return;
/* SVG image not finished yet */
if (strstr(Buf, "</svg>") == NULL)
return;
/* Use foreground as the current color, but transform to
* nanosvg color format (BGR). */
unsigned fg_r = (svg->fgcolor >> 16) & 0xff;
unsigned fg_g = (svg->fgcolor >> 8) & 0xff;
unsigned fg_b = (svg->fgcolor >> 0) & 0xff;
unsigned curcolor = NSVG_RGB(fg_r, fg_g, fg_b);
/* NULL-terminate Buf */
char *str = dStrndup(Buf, BufSize);
NSVGimage *nimg = nsvgParse(str, "px", svg->Image->dpi, curcolor);
dFree(str);
if (nimg == NULL) {
MSG_ERR("Svg_write: cannot parse SVG image\n");
return;
}
/* The height and width values can be nonintegral */
unsigned width = nimg->width;
unsigned height = nimg->height;
if (width == 0 || height == 0 || width > IMAGE_MAX_AREA / height) {
MSG_WARN("Svg_write: suspicious image size request %u x %u\n", width, height);
nsvgDelete(nimg);
return;
}
DilloImgType type = DILLO_IMG_TYPE_RGB;
unsigned stride = width * 4;
a_Dicache_set_parms(svg->url, svg->version, svg->Image,
width, height, type, 1 / 2.2);
unsigned char *dest = dNew(unsigned char, height * stride);
nsvgRasterizeXY(rasterizer, nimg, 0, 0, 1, 1, dest, width, height, stride);
unsigned bg_blue = (svg->bgcolor) & 0xFF;
unsigned bg_green = (svg->bgcolor >> 8) & 0xFF;
unsigned bg_red = (svg->bgcolor >> 16) & 0xFF;
unsigned char *line = dNew(unsigned char, width * 3);
for (unsigned i = 0; i < height; i++) {
for (unsigned j = 0; j < width; j++) {
unsigned r = dest[i * stride + 4 * j];
unsigned g = dest[i * stride + 4 * j + 1];
unsigned b = dest[i * stride + 4 * j + 2];
unsigned alpha = dest[i * stride + 4 * j + 3];
line[3 * j + 0] = (r * alpha + (bg_red * (0xFF - alpha))) / 0xFF;
line[3 * j + 1] = (g * alpha + (bg_green * (0xFF - alpha))) / 0xFF;
line[3 * j + 2] = (b * alpha + (bg_blue * (0xFF - alpha))) / 0xFF;
}
a_Dicache_write(svg->url, svg->version, line, i);
}
dFree(dest);
dFree(line);
nsvgDelete(nimg);
}
void a_Svg_callback(int Op, void *data)
{
if (Op == CA_Send) {
CacheClient_t *Client = data;
Svg_write(Client->CbData, Client->Buf, Client->BufSize);
} else if (Op == CA_Close) {
CacheClient_t *Client = data;
Svg_close(Client->CbData, Client);
} else if (Op == CA_Abort) {
Svg_free(data);
}
}
/*
* Create the image state data that must be kept between calls
*/
void *a_Svg_new(DilloImage *Image, DilloUrl *url, int version)
{
DilloSvg *svg = dNew0(DilloSvg, 1);
_MSG("a_Svg_new: svg=%p\n", svg);
svg->Image = Image;
svg->url = url;
svg->version = version;
svg->bgcolor = Image->bg_color;
svg->fgcolor = Image->fg_color;
return svg;
}
#else /* ENABLE_SVG */
void *a_Svg_new() { return 0; }
void a_Svg_callback() { return; }
#endif /* ENABLE_SVG */
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