31
32 #define SIG_BYTES 8
33
34 void PNGAPI
35 my_png_read_stream(png_structp png_ptr, png_bytep data, png_size_t length)
36 {
37 png_uint_32 check;
38
39 SplashStream * stream = (SplashStream*)png_get_io_ptr(png_ptr);
40 check = stream->read(stream, data, length);
41 if (check != length)
42 png_error(png_ptr, "Read Error");
43 }
44
45 int
46 SplashDecodePng(Splash * splash, png_rw_ptr read_func, void *io_ptr)
47 {
48 int stride;
49 ImageFormat srcFormat;
50 png_uint_32 i, rowbytes;
51 png_bytepp row_pointers = NULL;
52 png_bytep image_data = NULL;
53 int success = 0;
54 double gamma;
55
56 png_structp png_ptr = NULL;
57 png_infop info_ptr = NULL;
58
59 png_uint_32 width, height;
60 int bit_depth, color_type;
61
62 ImageRect srcRect, dstRect;
63
64 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
65 if (!png_ptr) {
66 goto done;
67 }
68
69 info_ptr = png_create_info_struct(png_ptr);
70 if (!info_ptr) {
71 goto done;
72 }
73
74 #ifdef __APPLE__
75 /* use setjmp/longjmp versions that do not save/restore the signal mask */
76 if (_setjmp(png_set_longjmp_fn(png_ptr, _longjmp, sizeof(jmp_buf)))) {
77 #else
78 if (setjmp(png_jmpbuf(png_ptr))) {
79 #endif
80 goto done;
81 }
82
83 png_set_read_fn(png_ptr, io_ptr, read_func);
84
85 png_set_sig_bytes(png_ptr, SIG_BYTES); /* we already read the 8 signature bytes */
86
87 png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */
88
89 png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
90 NULL, NULL, NULL);
91
92 /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
93 * transparency chunks to full alpha channel; strip 16-bit-per-sample
94 * images to 8 bits per sample; and convert grayscale to RGB[A]
95 * this may be sub-optimal but this simplifies implementation */
96
97 png_set_expand(png_ptr);
98 png_set_tRNS_to_alpha(png_ptr);
99 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
100 png_set_strip_16(png_ptr);
101 png_set_gray_to_rgb(png_ptr);
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31
32 #define SIG_BYTES 8
33
34 void PNGAPI
35 my_png_read_stream(png_structp png_ptr, png_bytep data, png_size_t length)
36 {
37 png_uint_32 check;
38
39 SplashStream * stream = (SplashStream*)png_get_io_ptr(png_ptr);
40 check = stream->read(stream, data, length);
41 if (check != length)
42 png_error(png_ptr, "Read Error");
43 }
44
45 int
46 SplashDecodePng(Splash * splash, png_rw_ptr read_func, void *io_ptr)
47 {
48 int stride;
49 ImageFormat srcFormat;
50 png_uint_32 i, rowbytes;
51 png_bytepp row_pointers;
52 png_bytep image_data;
53 int success = 0;
54 double gamma;
55
56 png_structp png_ptr = NULL;
57 png_infop info_ptr = NULL;
58
59 png_uint_32 width, height;
60 int bit_depth, color_type;
61
62 ImageRect srcRect, dstRect;
63
64 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
65 if (!png_ptr) {
66 row_pointers = NULL;
67 image_data = NULL;
68 goto done;
69 }
70
71 info_ptr = png_create_info_struct(png_ptr);
72 if (!info_ptr) {
73 row_pointers = NULL;
74 image_data = NULL;
75 goto done;
76 }
77
78 #ifdef __APPLE__
79 /* use setjmp/longjmp versions that do not save/restore the signal mask */
80 if (_setjmp(png_set_longjmp_fn(png_ptr, _longjmp, sizeof(jmp_buf)))) {
81 #else
82 if (setjmp(png_jmpbuf(png_ptr))) {
83 #endif
84 row_pointers = NULL;
85 image_data = NULL;
86 goto done;
87 }
88
89 row_pointers = NULL;
90 image_data = NULL;
91
92 png_set_read_fn(png_ptr, io_ptr, read_func);
93
94 png_set_sig_bytes(png_ptr, SIG_BYTES); /* we already read the 8 signature bytes */
95
96 png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */
97
98 png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
99 NULL, NULL, NULL);
100
101 /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
102 * transparency chunks to full alpha channel; strip 16-bit-per-sample
103 * images to 8 bits per sample; and convert grayscale to RGB[A]
104 * this may be sub-optimal but this simplifies implementation */
105
106 png_set_expand(png_ptr);
107 png_set_tRNS_to_alpha(png_ptr);
108 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
109 png_set_strip_16(png_ptr);
110 png_set_gray_to_rgb(png_ptr);
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