1 // Copyright 2020 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <cstdlib>
16
png_setjmp(png_structrp ptr)17 void png_setjmp(png_structrp ptr) { setjmp(png_jmpbuf(ptr)); }
18
png_fdopen(int fd,const char * mode)19 void* png_fdopen(int fd, const char* mode) {
20 FILE* f = fdopen(fd, mode);
21 return static_cast<void*>(f);
22 }
23
png_rewind(void * f)24 void png_rewind(void* f) { rewind(static_cast<FILE*>(f)); }
25
png_fread(void * buffer,size_t size,size_t count,void * stream)26 void png_fread(void* buffer, size_t size, size_t count, void* stream) {
27 fread(buffer, size, count, static_cast<FILE*>(stream));
28 }
29
png_fclose(void * f)30 void png_fclose(void* f) { fclose(static_cast<FILE*>(f)); }
31
png_init_io_wrapper(png_structrp png_ptr,void * f)32 void png_init_io_wrapper(png_structrp png_ptr, void* f) {
33 png_init_io(png_ptr, static_cast<FILE*>(f));
34 }
35
png_create_read_struct_wrapper(png_const_charp user_png_ver,png_voidp error_ptr)36 png_structp png_create_read_struct_wrapper(png_const_charp user_png_ver,
37 png_voidp error_ptr) {
38 return png_create_read_struct(user_png_ver, error_ptr, NULL, NULL);
39 }
40
png_create_write_struct_wrapper(png_const_charp user_png_ver,png_voidp error_ptr)41 png_structp png_create_write_struct_wrapper(png_const_charp user_png_ver,
42 png_voidp error_ptr) {
43 return png_create_write_struct(user_png_ver, error_ptr, NULL, NULL);
44 }
45
png_read_image_wrapper(png_structrp png_ptr,png_bytep image,size_t height,size_t rowbytes)46 void png_read_image_wrapper(png_structrp png_ptr, png_bytep image,
47 size_t height, size_t rowbytes) {
48 png_bytep* ptrs = (png_bytep*)malloc(height * sizeof(png_bytep));
49 for (size_t i = 0; i != height; ++i) {
50 ptrs[i] = image + (i * rowbytes);
51 }
52 png_read_image(png_ptr, ptrs);
53 free(ptrs);
54 }
55
png_write_image_wrapper(png_structrp png_ptr,png_bytep image,size_t height,size_t rowbytes)56 void png_write_image_wrapper(png_structrp png_ptr, png_bytep image,
57 size_t height, size_t rowbytes) {
58 png_bytep* ptrs = (png_bytep*)malloc(height * sizeof(png_bytep));
59 for (size_t i = 0; i != height; ++i) {
60 ptrs[i] = image + (i * rowbytes);
61 }
62 png_write_image(png_ptr, ptrs);
63 free(ptrs);
64 }
65