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Imported from libpng-1.0.1d.tar

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This commit is contained in:
Glenn Randers-Pehrson
1998-05-21 09:27:50 -05:00
parent d0dce40075
commit 8686fff347
35 changed files with 1252 additions and 182 deletions
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21
example.c
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@@ -316,18 +316,18 @@ 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_bytep row_pointers = row[y];
png_read_rows(png_ptr, &row_pointers, NULL, 1);
png_read_rows(png_ptr, &row_pointers[y], 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, NULL, number_of_rows);
png_read_rows(png_ptr, &row_pointers[y], NULL, number_of_rows);
png_read_rows(png_ptr, NULL, row_pointers[y], number_of_rows);
#else no_sparkle /* Read the image using the "rectangle" effect */
png_read_rows(png_ptr, NULL, row_pointers, number_of_rows);
png_read_rows(png_ptr, NULL, &row_pointers[y], number_of_rows);
#endif no_sparkle /* use only one of these two methods */
}
@@ -581,7 +581,7 @@ void write_png(char *file_name /* , ... other image information ... */)
text_ptr[2].key = "Description";
text_ptr[2].text = "<long text>";
text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
png_set_text(png_ptr, info_ptr, text_ptr, 2);
png_set_text(png_ptr, info_ptr, text_ptr, 3);
/* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
/* note that if sRGB is present the cHRM chunk must be ignored
@@ -638,7 +638,11 @@ void write_png(char *file_name /* , ... other image information ... */)
* layout, however, so choose what fits your needs best). You need to
* use the first method if you aren't handling interlacing yourself.
*/
png_byte row_pointers[height][width];
png_uint_32 k, height, width;
png_byte image[height][width];
png_bytep row_pointers[height];
for (k = 0; k < height; k++)
row_pointers[k] = image + k*width;
/* One of the following output methods is REQUIRED */
#ifdef entire /* write out the entire image data in one call */
@@ -653,13 +657,12 @@ void write_png(char *file_name /* , ... other image information ... */)
for (pass = 0; pass < number_passes; pass++)
{
/* Write a few rows at a time. */
png_write_rows(png_ptr, row_pointers, number_of_rows);
png_write_rows(png_ptr, &row_pointers[first_row], number_of_rows);
/* If you are only writing one row at a time, this works */
for (y = 0; y < height; y++)
{
png_bytep row_pointers = row[y];
png_write_rows(png_ptr, &row_pointers, 1);
png_write_rows(png_ptr, &row_pointers[y], 1);
}
}
#endif no_entire /* use only one output method */