#include <stdlib.h> /* for exit() prototype */
+#include <setjmp.h>
-#include "png.h" /* libpng header; includes zlib.h and setjmp.h */
+#include <zlib.h>
+#include "png.h" /* libpng header from the local directory */
#include "readpng2.h" /* typedefs, common macros, public prototypes */
png_uint_32 row_num, int pass);
static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr);
static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
+static void readpng2_warning_handler(png_structp png_ptr, png_const_charp msg);
void readpng2_version_info(void)
{
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
- (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
- defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
- /*
- * WARNING: This preprocessor approach means that the following code
- * cannot be used with a libpng DLL older than 1.2.0--the
- * compiled-in symbols for the new functions will not exist.
- * (Could use dlopen() and dlsym() on Unix and corresponding
- * calls for Windows, but not portable...)
- */
- {
- int mmxsupport = png_mmx_support();
- if (mmxsupport < 0)
- fprintf(stderr, " Compiled with libpng %s; using libpng %s "
- "without MMX support.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver);
- else {
- int compilerID;
- png_uint_32 mmx_mask = png_get_mmx_flagmask(
- PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
-
- fprintf(stderr, " Compiled with libpng %s; using libpng %s "
- "with MMX support\n (%s version).", PNG_LIBPNG_VER_STRING,
- png_libpng_ver, compilerID == 1? "MSVC++" :
- (compilerID == 2? "GNU C" : "unknown"));
- fprintf(stderr, " Processor (x86%s) %s MMX instructions.\n",
-#if defined(__x86_64__)
- "_64",
-#else
- "",
-#endif
- mmxsupport? "supports" : "does not support");
- if (mmxsupport > 0) {
- int num_optims = 0;
-
- fprintf(stderr,
- " Potential MMX optimizations supported by libpng:\n");
- if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)
- ++num_optims;
- if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_UP)
- ++num_optims;
- if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)
- ++num_optims;
- if (mmx_mask & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)
- ++num_optims;
- if (num_optims)
- fprintf(stderr,
- " decoding %s row filters (reading)\n",
- (num_optims == 4)? "all non-trivial" : "some");
- if (mmx_mask & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW) {
- fprintf(stderr, " combining rows (reading)\n");
- ++num_optims;
- }
- if (mmx_mask & PNG_ASM_FLAG_MMX_READ_INTERLACE) {
- fprintf(stderr,
- " expanding interlacing (reading)\n");
- ++num_optims;
- }
- mmx_mask &= ~( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
- | PNG_ASM_FLAG_MMX_READ_INTERLACE \
- | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
- | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
- | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
- | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
- if (mmx_mask) {
- fprintf(stderr, " other (unknown)\n");
- ++num_optims;
- }
- if (num_optims == 0)
- fprintf(stderr, " (none)\n");
- }
- }
- }
-#else
- fprintf(stderr, " Compiled with libpng %s; using libpng %s "
- "without MMX support.\n", PNG_LIBPNG_VER_STRING, png_libpng_ver);
-#endif
+ fprintf(stderr, " Compiled with libpng %s; using libpng %s\n",
+ PNG_LIBPNG_VER_STRING, png_libpng_ver);
- fprintf(stderr, " Compiled with zlib %s; using zlib %s.\n",
+ fprintf(stderr, " and with zlib %s; using zlib %s.\n",
ZLIB_VERSION, zlib_version);
}
/* could also replace libpng warning-handler (final NULL), but no need: */
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
- readpng2_error_handler, NULL);
+ readpng2_error_handler, readpng2_warning_handler);
if (!png_ptr)
return 4; /* out of memory */
}
-#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
/* prepare the reader to ignore all recognized chunks whose data won't be
* used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT,
* IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */
{
- /* These byte strings were copied from png.h. If a future libpng
- * version recognizes more chunks, add them to this list. If a
- * future version of readpng2.c recognizes more chunks, delete them
- * from this list. */
- static const png_byte chunks_to_ignore[] = {
- 99, 72, 82, 77, '\0', /* cHRM */
- 104, 73, 83, 84, '\0', /* hIST */
- 105, 67, 67, 80, '\0', /* iCCP */
- 105, 84, 88, 116, '\0', /* iTXt */
- 111, 70, 70, 115, '\0', /* oFFs */
- 112, 67, 65, 76, '\0', /* pCAL */
- 112, 72, 89, 115, '\0', /* pHYs */
- 115, 66, 73, 84, '\0', /* sBIT */
- 115, 67, 65, 76, '\0', /* sCAL */
- 115, 80, 76, 84, '\0', /* sPLT */
- 115, 84, 69, 82, '\0', /* sTER */
- 116, 69, 88, 116, '\0', /* tEXt */
- 116, 73, 77, 69, '\0', /* tIME */
- 122, 84, 88, 116, '\0' /* zTXt */
- };
-
- png_set_keep_unknown_chunks(png_ptr, 1 /* PNG_HANDLE_CHUNK_NEVER */,
- chunks_to_ignore, sizeof(chunks_to_ignore)/5);
+ /* These byte strings were copied from png.h. If a future version
+ * of readpng2.c recognizes more chunks, add them to this list.
+ */
+ static PNG_CONST png_byte chunks_to_process[] = {
+ 98, 75, 71, 68, '\0', /* bKGD */
+ 103, 65, 77, 65, '\0', /* gAMA */
+ 115, 82, 71, 66, '\0', /* sRGB */
+ };
+
+ /* Ignore all chunks except for IHDR, PLTE, tRNS, IDAT, and IEND */
+ png_set_keep_unknown_chunks(png_ptr, -1 /* PNG_HANDLE_CHUNK_NEVER */,
+ NULL, -1);
+
+ /* But do not ignore chunks in the "chunks_to_process" list */
+ png_set_keep_unknown_chunks(png_ptr,
+ 0 /* PNG_HANDLE_CHUNK_AS_DEFAULT */, chunks_to_process,
+ sizeof(chunks_to_process)/5);
}
-#endif /* PNG_UNKNOWN_CHUNKS_SUPPORTED */
+#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */
/* instead of doing png_init_io() here, now we set up our callback
readpng2_info_callback, readpng2_row_callback, readpng2_end_callback);
- /*
- * may as well enable or disable MMX routines here, if supported;
- *
- * to enable all: mask = png_get_mmx_flagmask (
- * PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
- * flags = png_get_asm_flags (png_ptr);
- * flags |= mask;
- * png_set_asm_flags (png_ptr, flags);
- *
- * to disable all: mask = png_get_mmx_flagmask (
- * PNG_SELECT_READ | PNG_SELECT_WRITE, &compilerID);
- * flags = png_get_asm_flags (png_ptr);
- * flags &= ~mask;
- * png_set_asm_flags (png_ptr, flags);
- */
-
-#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
- defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
- /*
- * WARNING: This preprocessor approach means that the following code
- * cannot be used with a libpng DLL older than 1.2.0--the
- * compiled-in symbols for the new functions will not exist.
- * (Could use dlopen() and dlsym() on Unix and corresponding
- * calls for Windows, but not portable...)
- */
- {
-#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
- png_uint_32 mmx_disable_mask = 0;
- png_uint_32 asm_flags, mmx_mask;
- int compilerID;
-
- if (mainprog_ptr->nommxfilters)
- mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
- | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
- | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
- | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
- if (mainprog_ptr->nommxcombine)
- mmx_disable_mask |= PNG_ASM_FLAG_MMX_READ_COMBINE_ROW;
- if (mainprog_ptr->nommxinterlace)
- mmx_disable_mask |= PNG_ASM_FLAG_MMX_READ_INTERLACE;
- asm_flags = png_get_asm_flags(png_ptr);
- png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
-
-
- /* Now query libpng's asm settings, just for yuks. Note that this
- * differs from the querying of its *potential* MMX capabilities
- * in readpng2_version_info(); this is true runtime verification. */
-
- asm_flags = png_get_asm_flags(png_ptr);
- mmx_mask = png_get_mmx_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE,
- &compilerID);
- if (asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED)
- fprintf(stderr,
- " MMX support (%s version) is compiled into libpng\n",
- compilerID == 1? "MSVC++" :
- (compilerID == 2? "GNU C" : "unknown"));
- else
- fprintf(stderr, " MMX support is not compiled into libpng\n");
- fprintf(stderr, " MMX instructions are %ssupported by CPU\n",
- (asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU)? "" : "not ");
- fprintf(stderr, " MMX read support for combining rows is %sabled\n",
- (asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)? "en" : "dis");
- fprintf(stderr,
- " MMX read support for expanding interlacing is %sabled\n",
- (asm_flags & PNG_ASM_FLAG_MMX_READ_INTERLACE)? "en" : "dis");
- fprintf(stderr, " MMX read support for \"sub\" filter is %sabled\n",
- (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)? "en" : "dis");
- fprintf(stderr, " MMX read support for \"up\" filter is %sabled\n",
- (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP)? "en" : "dis");
- fprintf(stderr, " MMX read support for \"avg\" filter is %sabled\n",
- (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG)? "en" : "dis");
- fprintf(stderr, " MMX read support for \"Paeth\" filter is %sabled\n",
- (asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)? "en" : "dis");
- asm_flags &= (mmx_mask & ~( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
- | PNG_ASM_FLAG_MMX_READ_INTERLACE \
- | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
- | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
- | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
- | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ));
- if (asm_flags)
- fprintf(stderr,
- " additional MMX support is also enabled (0x%02lx)\n",
- asm_flags);
-#else /* !PNG_ASSEMBLER_CODE_SUPPORTED */
- fprintf(stderr, " MMX querying is disabled in libpng.\n");
-#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
- }
-#endif
-
-
/* make sure we save our pointers for use in readpng2_decode_data() */
mainprog_ptr->png_ptr = png_ptr;
mainprog_info *mainprog_ptr;
int color_type, bit_depth;
png_uint_32 width, height;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
double gamma;
+#else
+ png_fixed_point gamma;
+#endif
/* setjmp() doesn't make sense here, because we'd either have to exit(),
png_set_expand(png_ptr);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
+#ifdef PNG_READ_16_TO_8_SUPPORTED
if (bit_depth == 16)
+# ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+ png_set_scale_16(png_ptr);
+# else
png_set_strip_16(png_ptr);
+# endif
+#endif
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
* "gamma" value for the entire display system, i.e., the product of
* LUT_exponent and CRT_exponent. */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, mainprog_ptr->display_exponent, gamma);
else
png_set_gamma(png_ptr, mainprog_ptr->display_exponent, 0.45455);
-
+#else
+ if (png_get_gAMA_fixed(png_ptr, info_ptr, &gamma))
+ png_set_gamma_fixed(png_ptr,
+ (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), gamma);
+ else
+ png_set_gamma_fixed(png_ptr,
+ (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), 45455);
+#endif
/* we'll let libpng expand interlaced images, too */
/* all done */
+ (void)info_ptr; /* Unused */
+
return;
}
}
-
+static void readpng2_warning_handler(png_structp png_ptr, png_const_charp msg)
+{
+ fprintf(stderr, "readpng2 libpng warning: %s\n", msg);
+ fflush(stderr);
+ (void)png_ptr; /* Unused */
+}
static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
exit(99);
}
+ /* Now we have our data structure we can use the information in it
+ * to return control to our own higher level code (all the points
+ * where 'setjmp' is called in this file.) This will work with other
+ * error handling mechanisms as well - libpng always calls png_error
+ * when it can proceed no further, thus, so long as the error handler
+ * is intercepted, application code can do its own error recovery.
+ */
longjmp(mainprog_ptr->jmpbuf, 1);
}
projects / platform / upstream / libpng.git / blobdiff