forked from AuroraMiddleware/gtk
[broadway] Use cairo to generate png uris
This commit is contained in:
Alexander Larsson
parent
0abd5e2767
commit
cfd8150759
@ -3,7 +3,7 @@
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#include <stdio.h>
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#include <assert.h>
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#include <errno.h>
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#include <zlib.h>
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#include <cairo.h>
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#include "broadway.h"
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@ -53,391 +53,117 @@ base64_uint32 (guint32 v, char *c)
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c[5] = base64_alphabet[(v >> 30) & 0x2];
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}
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/************************************************************************
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* conversion of raw image data to uncompressed png data: uris *
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************************************************************************/
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/***********************************************************
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* conversion of raw image data to png data: uris *
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***********************************************************/
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/* Table of CRCs of all 8-bit messages. */
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static unsigned long crc_table[256];
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struct PngTarget {
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GString *url;
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int state;
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int save;
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};
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/* Flag: has the table been computed? Initially false. */
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static int crc_table_computed = 0;
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/* Make the table for a fast CRC. */
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static void
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make_crc_table(void)
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static cairo_status_t
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write_png_url (void *closure,
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const unsigned char *data,
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unsigned int data_len)
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{
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unsigned long c;
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int n, k;
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struct PngTarget *target = closure;
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gsize res, old_len;
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for (n = 0; n < 256; n++) {
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c = (unsigned long) n;
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for (k = 0; k < 8; k++) {
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if (c & 1)
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c = 0xedb88320L ^ (c >> 1);
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else
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c = c >> 1;
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}
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crc_table[n] = c;
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}
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crc_table_computed = 1;
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}
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old_len = target->url->len;
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g_string_set_size (target->url,
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old_len + (data_len / 3 + 1) * 4 + 4);
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static unsigned long
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update_crc(unsigned long crc, unsigned char *buf, int len)
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{
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unsigned long c = crc;
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int n;
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res = g_base64_encode_step (data, data_len, FALSE,
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target->url->str + old_len,
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&target->state, &target->save);
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if (!crc_table_computed)
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make_crc_table();
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for (n = 0; n < len; n++) {
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c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
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}
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return c;
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}
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g_string_set_size (target->url, old_len + res);
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static unsigned long
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crc(unsigned char *buf, int len)
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{
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return update_crc(0xffffffffL, buf, len) ^ 0xffffffffL;
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}
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#define BASE 65521 /* largest prime smaller than 65536 */
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static unsigned long
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update_adler32(unsigned long adler, unsigned char *buf, int len)
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{
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unsigned long s1 = adler & 0xffff;
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unsigned long s2 = (adler >> 16) & 0xffff;
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int n;
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for (n = 0; n < len; n++) {
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s1 = (s1 + buf[n]) % BASE;
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s2 = (s2 + s1) % BASE;
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}
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return (s2 << 16) + s1;
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return CAIRO_STATUS_SUCCESS;
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}
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static char *
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to_png_rgb (int w, int h, int byte_stride, guint32 *data)
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{
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guchar header[] = {137, 80, 78, 71, 13, 10, 26, 10};
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guchar ihdr[13+12] = {0, 0, 0, 13, 'I', 'H', 'D', 'R',
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/* w: */ 0, 0, 0, 0, /* h: */ 0,0,0,0,
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/* bpp: */ 8, /* color type: */ 2,
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0, 0, 0};
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guchar idat_start[8] = { /* len: */0, 0, 0, 0, 'I', 'D', 'A', 'T' };
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guchar iend[12] = {0, 0, 0, 0, 'I', 'E', 'N', 'D', 0xae, 0x42, 0x60, 0x82};
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gsize data_size, row_size;
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char row_header[6];
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guint8 *png, *p, *p_row, *p_idat;
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guint32 *row;
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unsigned long adler;
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guint32 pixel;
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gsize png_size;
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int x, y;
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char *url, *url_base64;
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int state = 0, outlen;
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int save = 0;
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cairo_surface_t *surface;
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struct PngTarget target;
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gsize res, old_len;
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*(guint32 *)&ihdr[8] = GUINT32_TO_BE(w);
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*(guint32 *)&ihdr[12] = GUINT32_TO_BE(h);
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*(guint32 *)&ihdr[21] = GUINT32_TO_BE(crc(&ihdr[4], 13 + 4));
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target.url = g_string_new ("data:image/png;base64,");
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target.state = 0;
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target.save = 0;
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row_size = 1 + w * 3;
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row_header[0] = 0;
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row_header[1] = row_size & 0xff;
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row_header[2] = (row_size >> 8) & 0xff;
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row_header[3] = ~row_header[1];
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row_header[4] = ~row_header[2];
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row_header[5] = 0;
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surface = cairo_image_surface_create_for_data ((guchar *)data,
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CAIRO_FORMAT_RGB24, w, h, byte_stride);
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data_size = 2 + (6 + w * 3) * h + 4;
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cairo_surface_write_to_png_stream (surface, write_png_url, &target);
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*(guint32 *)&idat_start[0] = GUINT32_TO_BE(data_size);
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old_len = target.url->len;
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png_size = sizeof(header) + sizeof(ihdr) + 12 + data_size + sizeof(iend);
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png = g_malloc (png_size);
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g_string_set_size (target.url, old_len + 4);
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res = g_base64_encode_close (FALSE,
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target.url->str + old_len,
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&target.state, &target.save);
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g_string_set_size (target.url, old_len + res);
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p = png;
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memcpy (p, header, sizeof(header));
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p += sizeof(header);
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memcpy (p, ihdr, sizeof(ihdr));
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p += sizeof(ihdr);
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memcpy (p, idat_start, sizeof(idat_start));
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p += sizeof(idat_start);
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/* IDAT data:
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zlib header: 0x78, 0x01 ,
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h * scanline: row_header[] + width * r,g,b
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checksum: adler32
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*/
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p_idat = p - 4;
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/* zlib header */
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*p++ = 0x78;
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*p++ = 0x01;
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adler = 1;
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/* scanline data */
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for (y = 0; y < h; y++) {
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if (y == h - 1)
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row_header[0] = 1; /* final block */
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memcpy (p, row_header, sizeof(row_header));
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p += sizeof(row_header);
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p_row = p - 1;
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row = data;
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data += byte_stride / 4;
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for (x = 0; x < w; x++) {
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pixel = *row++;
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*p++ = (pixel >> 16) & 0xff; /* red */
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*p++ = (pixel >> 8) & 0xff; /* green */
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*p++ = (pixel >> 0) & 0xff; /* blue */
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}
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adler = update_adler32(adler, p_row, p - p_row);
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}
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/* adler32 */
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*(guint32 *)p = GUINT32_TO_BE(adler);
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p += 4;
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*(guint32 *)p = GUINT32_TO_BE(crc(p_idat, p - p_idat));
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p += 4;
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memcpy (p, iend, sizeof(iend));
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p += sizeof(iend);
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assert(p - png == png_size);
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url = g_malloc (strlen("data:image/png;base64,") +
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((png_size / 3 + 1) * 4 + 4) + 1);
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strcpy (url, "data:image/png;base64,");
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url_base64 = url + strlen("data:image/png;base64,");
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outlen = g_base64_encode_step (png, png_size, FALSE, url_base64, &state, &save);
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outlen += g_base64_encode_close (FALSE, url_base64 + outlen, &state, &save);
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url_base64[outlen] = 0;
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free (png);
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return url;
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return g_string_free (target.url, FALSE);
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}
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static char *
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to_png_rgba (int w, int h, int byte_stride, guint32 *data)
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{
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guchar header[] = {137, 80, 78, 71, 13, 10, 26, 10};
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guchar ihdr[13+12] = {0, 0, 0, 13, 'I', 'H', 'D', 'R',
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/* w: */ 0, 0, 0, 0, /* h: */ 0,0,0,0,
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/* bpp: */ 8, /* color type: */ 6,
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0, 0, 0};
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guchar idat_start[8] = { /* len: */0, 0, 0, 0, 'I', 'D', 'A', 'T' };
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guchar iend[12] = {0, 0, 0, 0, 'I', 'E', 'N', 'D', 0xae, 0x42, 0x60, 0x82};
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gsize data_size, row_size;
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char row_header[6];
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guint8 *png, *p, *p_row, *p_idat;
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guint32 *row;
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unsigned long adler;
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guint32 pixel;
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gsize png_size;
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int x, y;
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char *url, *url_base64;
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int state = 0, outlen;
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int save = 0;
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cairo_surface_t *surface;
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struct PngTarget target;
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gsize res, old_len;
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*(guint32 *)&ihdr[8] = GUINT32_TO_BE(w);
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*(guint32 *)&ihdr[12] = GUINT32_TO_BE(h);
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*(guint32 *)&ihdr[21] = GUINT32_TO_BE(crc(&ihdr[4], 13 + 4));
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target.url = g_string_new ("data:image/png;base64,");
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target.state = 0;
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target.save = 0;
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row_size = 1 + w * 4;
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row_header[0] = 0;
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row_header[1] = row_size & 0xff;
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row_header[2] = (row_size >> 8) & 0xff;
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row_header[3] = ~row_header[1];
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row_header[4] = ~row_header[2];
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row_header[5] = 0;
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surface = cairo_image_surface_create_for_data ((guchar *)data,
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CAIRO_FORMAT_ARGB32, w, h, byte_stride);
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data_size = 2 + (6 + w * 4) * h + 4;
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cairo_surface_write_to_png_stream (surface, write_png_url, &target);
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*(guint32 *)&idat_start[0] = GUINT32_TO_BE(data_size);
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old_len = target.url->len;
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png_size = sizeof(header) + sizeof(ihdr) + 12 + data_size + sizeof(iend);
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png = g_malloc (png_size);
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g_string_set_size (target.url, old_len + 4);
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res = g_base64_encode_close (FALSE,
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target.url->str + old_len,
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&target.state, &target.save);
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g_string_set_size (target.url, old_len + res);
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p = png;
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memcpy (p, header, sizeof(header));
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p += sizeof(header);
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memcpy (p, ihdr, sizeof(ihdr));
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p += sizeof(ihdr);
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memcpy (p, idat_start, sizeof(idat_start));
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p += sizeof(idat_start);
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/* IDAT data:
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zlib header: 0x78, 0x01 ,
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h * scanline: row_header[] + width * r,g,b,a
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checksum: adler32
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*/
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p_idat = p - 4;
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/* zlib header */
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*p++ = 0x78;
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*p++ = 0x01;
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adler = 1;
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/* scanline data */
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for (y = 0; y < h; y++) {
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if (y == h - 1)
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row_header[0] = 1; /* final block */
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memcpy (p, row_header, sizeof(row_header));
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p += sizeof(row_header);
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p_row = p - 1;
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row = data;
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data += byte_stride / 4;
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for (x = 0; x < w; x++) {
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pixel = *row++;
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*p++ = (pixel >> 16) & 0xff; /* red */
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*p++ = (pixel >> 8) & 0xff; /* green */
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*p++ = (pixel >> 0) & 0xff; /* blue */
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*p++ = (pixel >> 24) & 0xff; /* alpha */
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}
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adler = update_adler32(adler, p_row, p - p_row);
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}
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/* adler32 */
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*(guint32 *)p = GUINT32_TO_BE(adler);
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p += 4;
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*(guint32 *)p = GUINT32_TO_BE(crc(p_idat, p - p_idat));
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p += 4;
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memcpy (p, iend, sizeof(iend));
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p += sizeof(iend);
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assert(p - png == png_size);
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url = g_malloc (strlen("data:image/png;base64,") +
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((png_size / 3 + 1) * 4 + 4) + 1);
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strcpy (url, "data:image/png;base64,");
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url_base64 = url + strlen("data:image/png;base64,");
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outlen = g_base64_encode_step (png, png_size, FALSE, url_base64, &state, &save);
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outlen += g_base64_encode_close (FALSE, url_base64 + outlen, &state, &save);
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url_base64[outlen] = 0;
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free (png);
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return url;
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return g_string_free (target.url, FALSE);
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}
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#if 0
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static char *
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to_png_a (int w, int h, int byte_stride, guint8 *data)
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{
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guchar header[] = {137, 80, 78, 71, 13, 10, 26, 10};
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guchar ihdr[13+12] = {0, 0, 0, 13, 'I', 'H', 'D', 'R',
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/* w: */ 0, 0, 0, 0, /* h: */ 0,0,0,0,
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/* bpp: */ 8, /* color type: */ 4,
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0, 0, 0};
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guchar idat_start[8] = { /* len: */0, 0, 0, 0, 'I', 'D', 'A', 'T' };
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guchar iend[12] = {0, 0, 0, 0, 'I', 'E', 'N', 'D', 0xae, 0x42, 0x60, 0x82};
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gsize data_size, row_size;
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char row_header[6];
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guint8 *png, *p, *p_row, *p_idat;
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guint8 *row;
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unsigned long adler;
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guint32 pixel;
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gsize png_size;
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int x, y;
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char *url, *url_base64;
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int state = 0, outlen;
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int save = 0;
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cairo_surface_t *surface;
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struct PngTarget target;
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gsize res, old_len;
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*(guint32 *)&ihdr[8] = GUINT32_TO_BE(w);
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*(guint32 *)&ihdr[12] = GUINT32_TO_BE(h);
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*(guint32 *)&ihdr[21] = GUINT32_TO_BE(crc(&ihdr[4], 13 + 4));
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target.url = g_string_new ("data:image/png;base64,");
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target.state = 0;
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target.save = 0;
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row_size = 1 + w * 2;
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row_header[0] = 0;
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row_header[1] = row_size & 0xff;
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row_header[2] = (row_size >> 8) & 0xff;
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row_header[3] = ~row_header[1];
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row_header[4] = ~row_header[2];
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row_header[5] = 0;
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surface = cairo_image_surface_create_for_data (data,
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CAIRO_FORMAT_A8, w, h, byte_stride);
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data_size = 2 + (6 + w * 2) * h + 4;
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cairo_surface_write_to_png_stream (surface, write_png_url, &target);
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*(guint32 *)&idat_start[0] = GUINT32_TO_BE(data_size);
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old_len = target.url->len;
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png_size = sizeof(header) + sizeof(ihdr) + 12 + data_size + sizeof(iend);
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png = g_malloc (png_size);
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g_string_set_size (target.url, old_len + 4);
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res = g_base64_encode_close (FALSE,
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target.url->str + old_len,
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&target.state, &target.save);
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g_string_set_size (target.url, old_len + res);
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p = png;
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memcpy (p, header, sizeof(header));
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p += sizeof(header);
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memcpy (p, ihdr, sizeof(ihdr));
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p += sizeof(ihdr);
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memcpy (p, idat_start, sizeof(idat_start));
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p += sizeof(idat_start);
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/* IDAT data:
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zlib header: 0x78, 0x01 ,
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h * scanline: row_header[] + width * r,g,b,a
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checksum: adler32
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*/
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p_idat = p - 4;
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/* zlib header */
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*p++ = 0x78;
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*p++ = 0x01;
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adler = 1;
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/* scanline data */
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for (y = 0; y < h; y++) {
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if (y == h - 1)
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row_header[0] = 1; /* final block */
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memcpy (p, row_header, sizeof(row_header));
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p += sizeof(row_header);
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p_row = p - 1;
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row = data;
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data += byte_stride / 4;
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for (x = 0; x < w; x++) {
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pixel = *row++;
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*p++ = 0x00; /* gray */
|
||||
*p++ = pixel; /* alpha */
|
||||
}
|
||||
adler = update_adler32(adler, p_row, p - p_row);
|
||||
}
|
||||
|
||||
/* adler32 */
|
||||
*(guint32 *)p = GUINT32_TO_BE(adler);
|
||||
p += 4;
|
||||
*(guint32 *)p = GUINT32_TO_BE(crc(p_idat, p - p_idat));
|
||||
p += 4;
|
||||
|
||||
memcpy (p, iend, sizeof(iend));
|
||||
p += sizeof(iend);
|
||||
|
||||
assert(p - png == png_size);
|
||||
|
||||
url = g_malloc (strlen("data:image/png;base64,") +
|
||||
((png_size / 3 + 1) * 4 + 4) + 1);
|
||||
strcpy (url, "data:image/png;base64,");
|
||||
|
||||
url_base64 = url + strlen("data:image/png;base64,");
|
||||
outlen = g_base64_encode_step (png, png_size, FALSE, url_base64, &state, &save);
|
||||
outlen += g_base64_encode_close (FALSE, url_base64 + outlen, &state, &save);
|
||||
url_base64[outlen] = 0;
|
||||
|
||||
free (png);
|
||||
|
||||
return url;
|
||||
return g_string_free (target.url, FALSE);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user