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[libpng10] Imported from libpng-1.0.13.tar

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This commit is contained in:
Glenn Randers-Pehrson
2002-04-15 09:19:46 -05:00
parent e68f5a361b
commit 80b4f15ae3
104 changed files with 3675 additions and 11492 deletions
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86
example.c
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@@ -114,7 +114,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
if (info_ptr == NULL)
{
fclose(fp);
png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL);
return (ERROR);
}
@@ -126,7 +126,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
if (setjmp(png_jmpbuf(png_ptr)))
{
/* Free all of the memory associated with the png_ptr and info_ptr */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
fclose(fp);
/* If we get here, we had a problem reading the file */
return (ERROR);
@@ -157,7 +157,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
* adjustment), then you can read the entire image (including
* pixels) into the info structure with this call:
*/
png_read_png(png_ptr, info_ptr, png_transforms, NULL);
png_read_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
#else
/* OK, you're doing it the hard way, with the lower-level functions */
@@ -167,7 +167,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
&interlace_type, NULL, NULL);
&interlace_type, int_p_NULL, int_p_NULL);
/**** Set up the data transformations you want. Note that these are all
**** optional. Only call them if you want/need them. Many of the
@@ -194,17 +194,17 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
/* Expand paletted colors into true RGB triplets */
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png_ptr);
png_set_palette_rgb(png_ptr);
/* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_expand(png_ptr);
png_set_gray_1_2_4_to_8(png_ptr);
/* Expand paletted or RGB images with transparency to full alpha channels
* so the data will be available as RGBA quartets.
*/
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand(png_ptr);
png_set_tRNS_to_alpha(png_ptr);
/* Set the background color to draw transparent and alpha images over.
* It is possible to set the red, green, and blue components directly
@@ -277,7 +277,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
png_color std_color_cube[MAX_SCREEN_COLORS];
png_set_dither(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
MAX_SCREEN_COLORS, NULL, 0);
MAX_SCREEN_COLORS, png_uint_16p_NULL, 0);
}
/* This reduces the image to the palette supplied in the file */
else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette))
@@ -354,18 +354,18 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
#ifdef single /* Read the image a single row at a time */
for (y = 0; y < height; y++)
{
png_read_rows(png_ptr, &row_pointers[y], NULL, 1);
png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL, 1);
}
#else no_single /* Read the image several rows at a time */
for (y = 0; y < height; y += number_of_rows)
{
#ifdef sparkle /* Read the image using the "sparkle" effect. */
png_read_rows(png_ptr, &row_pointers[y], NULL, number_of_rows);
png_read_rows(png_ptr, NULL, row_pointers[y], number_of_rows);
png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL,
number_of_rows);
#else no_sparkle /* Read the image using the "rectangle" effect */
png_read_rows(png_ptr, NULL, &row_pointers[y], number_of_rows);
png_read_rows(png_ptr, png_bytepp_NULL, &row_pointers[y],
number_of_rows);
#endif no_sparkle /* use only one of these two methods */
}
@@ -382,7 +382,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
/* At this point you have read the entire image */
/* clean up after the read, and free any memory allocated - REQUIRED */
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
/* close the file */
fclose(fp);
@@ -415,13 +415,13 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
if (*info_ptr == NULL)
{
png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
return (ERROR);
}
if (setjmp(png_jmpbuf((*png_ptr))))
{
png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
return (ERROR);
}
@@ -450,7 +450,7 @@ process_data(png_structp *png_ptr, png_infop *info_ptr,
if (setjmp(png_jmpbuf((*png_ptr))))
{
/* Free the png_ptr and info_ptr memory on error */
png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
return (ERROR);
}
@@ -482,21 +482,47 @@ info_callback(png_structp png_ptr, png_infop info)
row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass)
{
/* this function is called for every row in the image. If the
* image is interlacing, and you turned on the interlace handler,
/*
* This function is called for every row in the image. If the
* image is interlaced, and you turned on the interlace handler,
* this function will be called for every row in every pass.
* Some of these rows will not be changed from the previous pass.
* When the row is not changed, the new_row variable will be NULL.
*
* In this function you will receive a pointer to new row data from
* libpng called new_row that is to replace a corresponding row (of
* the same data format) in a buffer allocated by your application.
*
* The new row data pointer new_row may be NULL, indicating there is
* no new data to be replaced (in cases of interlace loading).
*
* If new_row is not NULL then you need to call
* png_progressive_combine_row() to replace the corresponding row as
* shown below:
*/
/* Check if row_num is in bounds. */
if((row_num >= 0) && (row_num < height))
{
/* Get pointer to corresponding row in our
* PNG read buffer.
*/
png_bytep old_row = ((png_bytep *)our_data)[row_num];
/* If both rows are allocated then copy the new row
* data to the corresponding row data.
*/
if((old_row != NULL) && (new_row != NULL))
png_progressive_combine_row(png_ptr, old_row, new_row);
}
/*
* The rows and passes are called in order, so you don't really
* need the row_num and pass, but I'm supplying them because it
* may make your life easier.
*
* For the non-NULL rows of interlaced images, you must call
* png_progressive_combine_row() passing in the row and the
* old row. You can call this function for NULL rows (it will
* just return) and for non-interlaced images (it just does the
* png_memcpy for you) if it will make the code easier. Thus, you
* can just do this for all cases:
* png_progressive_combine_row() passing in the new row and the
* old row, as demonstrated above. You can call this function for
* NULL rows (it will just return) and for non-interlaced images
* (it just does the png_memcpy for you) if it will make the code
* easier. Thus, you can just do this for all cases:
*/
png_progressive_combine_row(png_ptr, old_row, new_row);
@@ -505,8 +531,8 @@ row_callback(png_structp png_ptr, png_bytep new_row,
* that the first pass (pass == 0 really) will completely cover
* the old row, so the rows do not have to be initialized. After
* the first pass (and only for interlaced images), you will have
* to pass the current row, and the function will combine the
* old row and the new row.
* to pass the current row as new_row, and the function will combine
* the old row and the new row.
*/
}
@@ -556,7 +582,7 @@ void write_png(char *file_name /* , ... other image information ... */)
if (info_ptr == NULL)
{
fclose(fp);
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
png_destroy_write_struct(&png_ptr, png_infopp_NULL);
return (ERROR);
}
@@ -588,7 +614,7 @@ void write_png(char *file_name /* , ... other image information ... */)
* image info living info in the structure. You could "|" many
* PNG_TRANSFORM flags into the png_transforms integer here.
*/
png_write_png(png_ptr, info_ptr, png_transforms, NULL);
png_write_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
#else
/* This is the hard way */