336 lines
9.1 KiB
C
336 lines
9.1 KiB
C
/*
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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* Copyright 2004 Richard Wilson <not_ginger_matt@hotmail.com>
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* Copyright 2008 Daniel Silverstone <dsilvers@netsurf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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/* Ugh -- setjmp.h weirdness ensues if this isn't first... */
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#include "image/png.h"
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#include "utils/config.h"
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#include "desktop/plotters.h"
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#include "content/content_protected.h"
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#include "image/bitmap.h"
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#include "utils/log.h"
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#include "utils/messages.h"
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#include "utils/utils.h"
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#ifdef WITH_PNG
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/* accomodate for old versions of libpng (beware security holes!) */
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#ifndef png_jmpbuf
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#warning you have an antique libpng
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#define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
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#endif
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#if PNG_LIBPNG_VER < 10209
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#define png_set_expand_gray_1_2_4_to_8(png) png_set_gray_1_2_4_to_8(png)
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#endif
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/* I hate doing this, but without g_strdup_printf or similar, we're a tad stuck. */
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#define NSPNG_TITLE_LEN (100)
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/* libpng uses names starting png_, so use nspng_ here to avoid clashes */
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static void info_callback(png_structp png, png_infop info);
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static void row_callback(png_structp png, png_bytep new_row,
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png_uint_32 row_num, int pass);
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static void end_callback(png_structp png, png_infop info);
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bool nspng_create(struct content *c, const struct http_parameter *params)
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{
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union content_msg_data msg_data;
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c->data.png.bitmap = NULL;
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c->data.png.png = png_create_read_struct(PNG_LIBPNG_VER_STRING,
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0, 0, 0);
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if (c->data.png.png == NULL) {
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msg_data.error = messages_get("NoMemory");
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content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
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warn_user("NoMemory", 0);
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return false;
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}
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c->data.png.info = png_create_info_struct(c->data.png.png);
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if (c->data.png.info == NULL) {
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png_destroy_read_struct(&c->data.png.png,
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&c->data.png.info, 0);
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msg_data.error = messages_get("NoMemory");
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content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
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warn_user("NoMemory", 0);
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return false;
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}
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if (setjmp(png_jmpbuf(c->data.png.png))) {
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png_destroy_read_struct(&c->data.png.png,
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&c->data.png.info, 0);
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LOG(("Failed to set callbacks"));
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c->data.png.png = NULL;
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c->data.png.info = NULL;
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msg_data.error = messages_get("PNGError");
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content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
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return false;
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}
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png_set_progressive_read_fn(c->data.png.png, c,
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info_callback, row_callback, end_callback);
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return true;
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}
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bool nspng_process_data(struct content *c, char *data, unsigned int size)
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{
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union content_msg_data msg_data;
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if (setjmp(png_jmpbuf(c->data.png.png))) {
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png_destroy_read_struct(&c->data.png.png,
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&c->data.png.info, 0);
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LOG(("Failed to process data"));
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c->data.png.png = NULL;
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c->data.png.info = NULL;
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if (c->data.png.bitmap != NULL) {
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bitmap_destroy(c->data.png.bitmap);
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c->data.png.bitmap = NULL;
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}
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msg_data.error = messages_get("PNGError");
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content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
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return false;
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}
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png_process_data(c->data.png.png, c->data.png.info,
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(uint8_t *) data, size);
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return true;
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}
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/**
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* info_callback -- PNG header has been completely received, prepare to process
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* image data
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*/
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void info_callback(png_structp png, png_infop info)
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{
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int bit_depth, color_type, interlace, intent;
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double gamma;
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png_uint_32 width, height;
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struct content *c = png_get_progressive_ptr(png);
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/* Read the PNG details */
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png_get_IHDR(png, info, &width, &height, &bit_depth,
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&color_type, &interlace, 0, 0);
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/* Claim the required memory for the converted PNG */
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c->data.png.bitmap = bitmap_create(width, height, BITMAP_NEW);
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if (c->data.png.bitmap == NULL) {
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/* Failed -- bail out */
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longjmp(png_jmpbuf(png), 1);
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}
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c->data.png.rowstride = bitmap_get_rowstride(c->data.png.bitmap);
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c->data.png.bpp = bitmap_get_bpp(c->data.png.bitmap);
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/* Set up our transformations */
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_palette_to_rgb(png);
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if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
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png_set_expand_gray_1_2_4_to_8(png);
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if (png_get_valid(png, info, PNG_INFO_tRNS))
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png_set_tRNS_to_alpha(png);
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if (bit_depth == 16)
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png_set_strip_16(png);
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if (color_type == PNG_COLOR_TYPE_GRAY ||
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color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
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png_set_gray_to_rgb(png);
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if (!(color_type & PNG_COLOR_MASK_ALPHA))
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png_set_filler(png, 0xff, PNG_FILLER_AFTER);
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/* gamma correction - we use 2.2 as our screen gamma
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* this appears to be correct (at least in respect to !Browse)
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* see http://www.w3.org/Graphics/PNG/all_seven.html for a test case
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*/
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if (png_get_sRGB(png, info, &intent))
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png_set_gamma(png, 2.2, 0.45455);
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else {
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if (png_get_gAMA(png, info, &gamma))
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png_set_gamma(png, 2.2, gamma);
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else
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png_set_gamma(png, 2.2, 0.45455);
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}
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png_read_update_info(png, info);
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c->data.png.rowbytes = png_get_rowbytes(png, info);
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c->data.png.interlace = (interlace == PNG_INTERLACE_ADAM7);
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c->width = width;
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c->height = height;
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LOG(("size %li * %li, bpp %i, rowbytes %zu", (unsigned long)width,
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(unsigned long)height, bit_depth, c->data.png.rowbytes));
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}
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static unsigned int interlace_start[8] = {0, 16, 0, 8, 0, 4, 0};
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static unsigned int interlace_step[8] = {28, 28, 12, 12, 4, 4, 0};
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static unsigned int interlace_row_start[8] = {0, 0, 4, 0, 2, 0, 1};
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static unsigned int interlace_row_step[8] = {8, 8, 8, 4, 4, 2, 2};
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void row_callback(png_structp png, png_bytep new_row,
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png_uint_32 row_num, int pass)
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{
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struct content *c = png_get_progressive_ptr(png);
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unsigned long i, j, rowbytes = c->data.png.rowbytes;
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unsigned int start, step;
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unsigned char *buffer, *row;
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/* Give up if there's no bitmap */
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if (c->data.png.bitmap == NULL)
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return;
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/* Abort if we've not got any data */
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if (new_row == NULL)
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return;
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/* Get bitmap buffer */
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buffer = bitmap_get_buffer(c->data.png.bitmap);
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if (buffer == NULL) {
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/* No buffer, bail out */
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longjmp(png_jmpbuf(png), 1);
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}
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/* Calculate address of row start */
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row = buffer + (c->data.png.rowstride * row_num);
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/* Handle interlaced sprites using the Adam7 algorithm */
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if (c->data.png.interlace) {
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start = interlace_start[pass];
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step = interlace_step[pass];
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row_num = interlace_row_start[pass] +
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interlace_row_step[pass] * row_num;
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/* Copy the data to our current row taking interlacing
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* into consideration */
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row = buffer + (c->data.png.rowstride * row_num);
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for (j = 0, i = start; i < rowbytes; i += step) {
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row[i++] = new_row[j++];
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row[i++] = new_row[j++];
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row[i++] = new_row[j++];
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row[i++] = new_row[j++];
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}
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} else {
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/* Do a fast memcpy of the row data */
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memcpy(row, new_row, rowbytes);
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}
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}
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void end_callback(png_structp png, png_infop info)
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{
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}
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bool nspng_convert(struct content *c, int width, int height)
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{
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const char *data;
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unsigned long size;
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assert(c->data.png.png != NULL);
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assert(c->data.png.info != NULL);
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data = content__get_source_data(c, &size);
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png_destroy_read_struct(&c->data.png.png, &c->data.png.info, 0);
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c->title = malloc(NSPNG_TITLE_LEN);
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if (c->title != NULL) {
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snprintf(c->title, NSPNG_TITLE_LEN, messages_get("PNGTitle"),
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c->width, c->height, size);
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}
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c->size += (c->width * c->height * 4) + NSPNG_TITLE_LEN;
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assert(c->data.png.bitmap != NULL);
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c->bitmap = c->data.png.bitmap;
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bitmap_set_opaque(c->bitmap, bitmap_test_opaque(c->bitmap));
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bitmap_modified(c->bitmap);
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c->status = CONTENT_STATUS_DONE;
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content_set_status(c, "");
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return true;
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}
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void nspng_destroy(struct content *c)
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{
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free(c->title);
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if (c->data.png.bitmap != NULL) {
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bitmap_destroy(c->data.png.bitmap);
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}
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}
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bool nspng_redraw(struct content *c, int x, int y,
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int width, int height,
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int clip_x0, int clip_y0, int clip_x1, int clip_y1,
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float scale, colour background_colour)
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{
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assert(c->bitmap != NULL);
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return plot.bitmap(x, y, width, height, c->bitmap,
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background_colour, BITMAPF_NONE);
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}
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bool nspng_redraw_tiled(struct content *c, int x, int y, int width, int height,
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int clip_x0, int clip_y0, int clip_x1, int clip_y1,
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float scale, colour background_colour,
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bool repeat_x, bool repeat_y)
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{
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bitmap_flags_t flags = 0;
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assert(c->bitmap != NULL);
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if (repeat_x)
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flags |= BITMAPF_REPEAT_X;
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if (repeat_y)
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flags |= BITMAPF_REPEAT_Y;
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return plot.bitmap(x, y, width, height, c->bitmap,
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background_colour, flags);
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}
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#endif
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