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-rw-r--r--image/png.c614
1 files changed, 0 insertions, 614 deletions
diff --git a/image/png.c b/image/png.c
deleted file mode 100644
index 11903cbd3..000000000
--- a/image/png.c
+++ /dev/null
@@ -1,614 +0,0 @@
-/*
- * Copyright 2004 James Bursa <bursa@users.sourceforge.net>
- * Copyright 2004 Richard Wilson <not_ginger_matt@hotmail.com>
- * Copyright 2008 Daniel Silverstone <dsilvers@netsurf-browser.org>
- *
- * This file is part of NetSurf, http://www.netsurf-browser.org/
- *
- * NetSurf 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; version 2 of the License.
- *
- * NetSurf is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <stdbool.h>
-#include <stdlib.h>
-#include <png.h>
-
-#include "utils/utils.h"
-#include "utils/log.h"
-#include "utils/messages.h"
-#include "content/content_protected.h"
-#include "desktop/gui_internal.h"
-
-#include "image/image_cache.h"
-#include "image/bitmap.h"
-#include "image/png.h"
-
-/* accommodate for old versions of libpng (beware security holes!) */
-
-#ifndef png_jmpbuf
-#warning you have an antique libpng
-#define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
-#endif
-
-#if PNG_LIBPNG_VER < 10209
-#define png_set_expand_gray_1_2_4_to_8(png) png_set_gray_1_2_4_to_8(png)
-#endif
-
-typedef struct nspng_content {
- struct content base; /**< base content type */
-
- bool no_process_data; /**< Do not continue to process data as it arrives */
- png_structp png;
- png_infop info;
- int interlace;
- struct bitmap *bitmap; /**< Created NetSurf bitmap */
- size_t rowstride, bpp; /**< Bitmap rowstride and bpp */
- size_t rowbytes; /**< Number of bytes per row */
-} nspng_content;
-
-static unsigned int interlace_start[8] = {0, 16, 0, 8, 0, 4, 0};
-static unsigned int interlace_step[8] = {28, 28, 12, 12, 4, 4, 0};
-static unsigned int interlace_row_start[8] = {0, 0, 4, 0, 2, 0, 1};
-static unsigned int interlace_row_step[8] = {8, 8, 8, 4, 4, 2, 2};
-
-/** Callbak error numbers*/
-enum nspng_cberr {
- CBERR_NONE = 0, /* no error */
- CBERR_LIBPNG, /* error from png library */
- CBERR_NOPRE, /* no pre-conversion performed */
-};
-
-/**
- * nspng_warning -- callback for libpng warnings
- */
-static void nspng_warning(png_structp png_ptr, png_const_charp warning_message)
-{
- LOG("%s", warning_message);
-}
-
-/**
- * nspng_error -- callback for libpng errors
- */
-static void nspng_error(png_structp png_ptr, png_const_charp error_message)
-{
- LOG("%s", error_message);
- longjmp(png_jmpbuf(png_ptr), CBERR_LIBPNG);
-}
-
-static void nspng_setup_transforms(png_structp png_ptr, png_infop info_ptr)
-{
- int bit_depth, color_type, intent;
- double gamma;
-
- bit_depth = png_get_bit_depth(png_ptr, info_ptr);
- color_type = png_get_color_type(png_ptr, info_ptr);
-
- /* Set up our transformations */
- if (color_type == PNG_COLOR_TYPE_PALETTE) {
- png_set_palette_to_rgb(png_ptr);
- }
-
- if ((color_type == PNG_COLOR_TYPE_GRAY) && (bit_depth < 8)) {
- png_set_expand_gray_1_2_4_to_8(png_ptr);
- }
-
- if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
- png_set_tRNS_to_alpha(png_ptr);
- }
-
- if (bit_depth == 16) {
- png_set_strip_16(png_ptr);
- }
-
- if (color_type == PNG_COLOR_TYPE_GRAY ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
- png_set_gray_to_rgb(png_ptr);
- }
-
- if (!(color_type & PNG_COLOR_MASK_ALPHA)) {
- png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
- }
-
- /* gamma correction - we use 2.2 as our screen gamma
- * this appears to be correct (at least in respect to !Browse)
- * see http://www.w3.org/Graphics/PNG/all_seven.html for a test case
- */
- if (png_get_sRGB(png_ptr, info_ptr, &intent)) {
- png_set_gamma(png_ptr, 2.2, 0.45455);
- } else {
- if (png_get_gAMA(png_ptr, info_ptr, &gamma)) {
- png_set_gamma(png_ptr, 2.2, gamma);
- } else {
- png_set_gamma(png_ptr, 2.2, 0.45455);
- }
- }
-
- png_read_update_info(png_ptr, info_ptr);
-}
-
-/**
- * info_callback -- PNG header has been completely received, prepare to process
- * image data
- */
-static void info_callback(png_structp png_s, png_infop info)
-{
- int interlace;
- png_uint_32 width, height;
- nspng_content *png_c = png_get_progressive_ptr(png_s);
-
- width = png_get_image_width(png_s, info);
- height = png_get_image_height(png_s, info);
- interlace = png_get_interlace_type(png_s, info);
-
- png_c->base.width = width;
- png_c->base.height = height;
- png_c->base.size += width * height * 4;
-
- /* see if progressive-conversion should continue */
- if (image_cache_speculate((struct content *)png_c) == false) {
- longjmp(png_jmpbuf(png_s), CBERR_NOPRE);
- }
-
- /* Claim the required memory for the converted PNG */
- png_c->bitmap = guit->bitmap->create(width, height, BITMAP_NEW);
- if (png_c->bitmap == NULL) {
- /* Failed to create bitmap skip pre-conversion */
- longjmp(png_jmpbuf(png_s), CBERR_NOPRE);
- }
-
- png_c->rowstride = guit->bitmap->get_rowstride(png_c->bitmap);
- png_c->bpp = guit->bitmap->get_bpp(png_c->bitmap);
-
- nspng_setup_transforms(png_s, info);
-
- png_c->rowbytes = png_get_rowbytes(png_s, info);
- png_c->interlace = (interlace == PNG_INTERLACE_ADAM7);
-
- LOG("size %li * %li, rowbytes %" PRIsizet,
- (unsigned long)width,
- (unsigned long)height,
- png_c->rowbytes);
-}
-
-static void row_callback(png_structp png_s, png_bytep new_row,
- png_uint_32 row_num, int pass)
-{
- nspng_content *png_c = png_get_progressive_ptr(png_s);
- unsigned long rowbytes = png_c->rowbytes;
- unsigned char *buffer, *row;
-
- /* Give up if there's no bitmap */
- if (png_c->bitmap == NULL)
- return;
-
- /* Abort if we've not got any data */
- if (new_row == NULL)
- return;
-
- /* Get bitmap buffer */
- buffer = guit->bitmap->get_buffer(png_c->bitmap);
- if (buffer == NULL) {
- /* No buffer, bail out */
- longjmp(png_jmpbuf(png_s), 1);
- }
-
- /* Calculate address of row start */
- row = buffer + (png_c->rowstride * row_num);
-
- /* Handle interlaced sprites using the Adam7 algorithm */
- if (png_c->interlace) {
- unsigned long dst_off;
- unsigned long src_off = 0;
- unsigned int start, step;
-
- start = interlace_start[pass];
- step = interlace_step[pass];
- row_num = interlace_row_start[pass] +
- interlace_row_step[pass] * row_num;
-
- /* Copy the data to our current row taking interlacing
- * into consideration */
- row = buffer + (png_c->rowstride * row_num);
-
- for (dst_off = start; dst_off < rowbytes; dst_off += step) {
- row[dst_off++] = new_row[src_off++];
- row[dst_off++] = new_row[src_off++];
- row[dst_off++] = new_row[src_off++];
- row[dst_off++] = new_row[src_off++];
- }
- } else {
- /* Do a fast memcpy of the row data */
- memcpy(row, new_row, rowbytes);
- }
-}
-
-
-static void end_callback(png_structp png_s, png_infop info)
-{
-}
-
-static nserror nspng_create_png_data(nspng_content *png_c)
-{
- union content_msg_data msg_data;
-
- png_c->bitmap = NULL;
-
- png_c->png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
- if (png_c->png == NULL) {
- msg_data.error = messages_get("NoMemory");
- content_broadcast(&png_c->base, CONTENT_MSG_ERROR, msg_data);
- return NSERROR_NOMEM;
- }
-
- png_set_error_fn(png_c->png, NULL, nspng_error, nspng_warning);
-
- png_c->info = png_create_info_struct(png_c->png);
- if (png_c->info == NULL) {
- png_destroy_read_struct(&png_c->png, &png_c->info, 0);
-
- msg_data.error = messages_get("NoMemory");
- content_broadcast(&png_c->base, CONTENT_MSG_ERROR, msg_data);
- return NSERROR_NOMEM;
- }
-
- if (setjmp(png_jmpbuf(png_c->png))) {
- png_destroy_read_struct(&png_c->png, &png_c->info, 0);
- LOG("Failed to set callbacks");
- png_c->png = NULL;
- png_c->info = NULL;
-
- msg_data.error = messages_get("PNGError");
- content_broadcast(&png_c->base, CONTENT_MSG_ERROR, msg_data);
- return NSERROR_NOMEM;
- }
-
- png_set_progressive_read_fn(png_c->png, png_c,
- info_callback, row_callback, end_callback);
-
- return NSERROR_OK;
-}
-
-static nserror nspng_create(const content_handler *handler,
- lwc_string *imime_type, const struct http_parameter *params,
- llcache_handle *llcache, const char *fallback_charset,
- bool quirks, struct content **c)
-{
- nspng_content *png_c;
- nserror error;
-
- png_c = calloc(1, sizeof(nspng_content));
- if (png_c == NULL)
- return NSERROR_NOMEM;
-
- error = content__init(&png_c->base,
- handler,
- imime_type,
- params,
- llcache,
- fallback_charset,
- quirks);
- if (error != NSERROR_OK) {
- free(png_c);
- return error;
- }
-
- error = nspng_create_png_data(png_c);
- if (error != NSERROR_OK) {
- free(png_c);
- return error;
- }
-
- *c = (struct content *)png_c;
-
- return NSERROR_OK;
-}
-
-
-static bool nspng_process_data(struct content *c, const char *data,
- unsigned int size)
-{
- nspng_content *png_c = (nspng_content *)c;
- union content_msg_data msg_data;
- volatile bool ret = true;
-
- if (png_c->no_process_data) {
- return ret;
- }
-
- switch (setjmp(png_jmpbuf(png_c->png))) {
- case CBERR_NONE: /* direct return */
- png_process_data(png_c->png, png_c->info, (uint8_t *)data, size);
- break;
-
- case CBERR_NOPRE: /* not going to progressive convert */
- png_c->no_process_data = true;
- break;
-
- default: /* fatal error from library processing png */
- if (png_c->bitmap != NULL) {
- /* A bitmap managed to get created so
- * operation is past header and possibly some
- * conversion happened before faliure.
- *
- * In this case keep the partial
- * conversion. This is usually seen if a png
- * has been truncated (often jsut lost its
- * last byte and hence end of image marker)
- */
- png_c->no_process_data = true;
- } else {
- /* not managed to progress past header, clean
- * up png conversion and signal the content
- * error
- */
- LOG("Fatal PNG error during header, error content");
-
- png_destroy_read_struct(&png_c->png, &png_c->info, 0);
- png_c->png = NULL;
- png_c->info = NULL;
-
- msg_data.error = messages_get("PNGError");
- content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
-
- ret = false;
-
- }
- break;
- }
-
- return ret;
-}
-
-struct png_cache_read_data_s {
- const char *data;
- unsigned long size;
-};
-
-/** PNG library read fucntion to read data from a memory array
- */
-static void
-png_cache_read_fn(png_structp png_ptr, png_bytep data, png_size_t length)
-{
- struct png_cache_read_data_s *png_cache_read_data;
- png_cache_read_data = png_get_io_ptr(png_ptr);
-
- if (length > png_cache_read_data->size) {
- length = png_cache_read_data->size;
- }
-
- if (length == 0) {
- png_error(png_ptr, "Read Error");
- }
-
- memcpy(data, png_cache_read_data->data, length);
-
- png_cache_read_data->data += length;
- png_cache_read_data->size -= length;
-}
-
-/** calculate an array of row pointers into a bitmap data area
- */
-static png_bytep *calc_row_pointers(struct bitmap *bitmap)
-{
- int height = guit->bitmap->get_height(bitmap);
- unsigned char *buffer= guit->bitmap->get_buffer(bitmap);
- size_t rowstride = guit->bitmap->get_rowstride(bitmap);
- png_bytep *row_ptrs;
- int hloop;
-
- /* The buffer allocation may occour when the buffer is aquired
- * and therefore may fail.
- */
- if (buffer == NULL) {
- return NULL;
- }
-
- row_ptrs = malloc(sizeof(png_bytep) * height);
-
- if (row_ptrs != NULL) {
- for (hloop = 0; hloop < height; hloop++) {
- row_ptrs[hloop] = buffer + (rowstride * hloop);
- }
- }
-
- return row_ptrs;
-}
-
-/** PNG content to bitmap conversion.
- *
- * This routine generates a bitmap object from a PNG image content
- */
-static struct bitmap *
-png_cache_convert(struct content *c)
-{
- png_structp png_ptr;
- png_infop info_ptr;
- png_infop end_info_ptr;
- volatile struct bitmap * volatile bitmap = NULL;
- struct png_cache_read_data_s png_cache_read_data;
- png_uint_32 width, height;
- volatile png_bytep * volatile row_pointers = NULL;
-
- png_cache_read_data.data =
- content__get_source_data(c, &png_cache_read_data.size);
-
- if ((png_cache_read_data.data == NULL) ||
- (png_cache_read_data.size <= 8)) {
- return NULL;
- }
-
- png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
- nspng_error, nspng_warning);
- if (png_ptr == NULL) {
- return NULL;
- }
-
- info_ptr = png_create_info_struct(png_ptr);
- if (info_ptr == NULL) {
- png_destroy_read_struct(&png_ptr, NULL, NULL);
- return NULL;
- }
-
- end_info_ptr = png_create_info_struct(png_ptr);
- if (end_info_ptr == NULL) {
- png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
- return NULL;
- }
-
- /* setup error exit path */
- if (setjmp(png_jmpbuf(png_ptr))) {
- /* cleanup and bail */
- goto png_cache_convert_error;
- }
-
- /* read from a buffer instead of stdio */
- png_set_read_fn(png_ptr, &png_cache_read_data, png_cache_read_fn);
-
- /* ensure the png info structure is populated */
- png_read_info(png_ptr, info_ptr);
-
- /* setup output transforms */
- nspng_setup_transforms(png_ptr, info_ptr);
-
- width = png_get_image_width(png_ptr, info_ptr);
- height = png_get_image_height(png_ptr, info_ptr);
-
- /* Claim the required memory for the converted PNG */
- bitmap = guit->bitmap->create(width, height, BITMAP_NEW);
- if (bitmap == NULL) {
- /* cleanup and bail */
- goto png_cache_convert_error;
- }
-
- row_pointers = calc_row_pointers((struct bitmap *) bitmap);
-
- if (row_pointers != NULL) {
- png_read_image(png_ptr, (png_bytep *) row_pointers);
- } else {
- guit->bitmap->destroy((struct bitmap *)bitmap);
- bitmap = NULL;
- }
-
-png_cache_convert_error:
-
- /* cleanup png read */
- png_destroy_read_struct(&png_ptr, &info_ptr, &end_info_ptr);
-
- if (row_pointers != NULL) {
- free((png_bytep *) row_pointers);
- }
-
- if (bitmap != NULL) {
- guit->bitmap->modified((struct bitmap *)bitmap);
- }
-
- return (struct bitmap *)bitmap;
-}
-
-static bool nspng_convert(struct content *c)
-{
- nspng_content *png_c = (nspng_content *) c;
- char *title;
-
- assert(png_c->png != NULL);
- assert(png_c->info != NULL);
-
- /* clean up png structures */
- png_destroy_read_struct(&png_c->png, &png_c->info, 0);
-
- /* set title text */
- title = messages_get_buff("PNGTitle",
- nsurl_access_leaf(llcache_handle_get_url(c->llcache)),
- c->width, c->height);
- if (title != NULL) {
- content__set_title(c, title);
- free(title);
- }
-
- if (png_c->bitmap != NULL) {
- guit->bitmap->set_opaque(png_c->bitmap, guit->bitmap->test_opaque(png_c->bitmap));
- guit->bitmap->modified(png_c->bitmap);
- }
-
- image_cache_add(c, png_c->bitmap, png_cache_convert);
-
- content_set_ready(c);
- content_set_done(c);
- content_set_status(c, "");
-
- return true;
-}
-
-
-static nserror nspng_clone(const struct content *old_c, struct content **new_c)
-{
- nspng_content *clone_png_c;
- nserror error;
- const char *data;
- unsigned long size;
-
- clone_png_c = calloc(1, sizeof(nspng_content));
- if (clone_png_c == NULL)
- return NSERROR_NOMEM;
-
- error = content__clone(old_c, &clone_png_c->base);
- if (error != NSERROR_OK) {
- content_destroy(&clone_png_c->base);
- return error;
- }
-
- /* Simply replay create/process/convert */
- error = nspng_create_png_data(clone_png_c);
- if (error != NSERROR_OK) {
- content_destroy(&clone_png_c->base);
- return error;
- }
-
- data = content__get_source_data(&clone_png_c->base, &size);
- if (size > 0) {
- if (nspng_process_data(&clone_png_c->base, data, size) == false) {
- content_destroy(&clone_png_c->base);
- return NSERROR_NOMEM;
- }
- }
-
- if ((old_c->status == CONTENT_STATUS_READY) ||
- (old_c->status == CONTENT_STATUS_DONE)) {
- if (nspng_convert(&clone_png_c->base) == false) {
- content_destroy(&clone_png_c->base);
- return NSERROR_CLONE_FAILED;
- }
- }
-
- *new_c = (struct content *)clone_png_c;
-
- return NSERROR_OK;
-}
-
-static const content_handler nspng_content_handler = {
- .create = nspng_create,
- .process_data = nspng_process_data,
- .data_complete = nspng_convert,
- .clone = nspng_clone,
- .destroy = image_cache_destroy,
- .redraw = image_cache_redraw,
- .get_internal = image_cache_get_internal,
- .type = image_cache_content_type,
- .no_share = false,
-};
-
-static const char *nspng_types[] = {
- "image/png",
- "image/x-png"
-};
-
-CONTENT_FACTORY_REGISTER_TYPES(nspng, nspng_types, nspng_content_handler);
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-23 13:00:11 +0000