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file-mng: Call png_set_*() functions after png_set_IHDR()

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This commit is contained in:
Mukund Sivaraman 2011-05-06 16:28:25 +05:30
parent cbc2ffc7c2
commit 17c5e114c3
1 changed files with 44 additions and 10 deletions
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54
plug-ins/common/file-mng.c
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@ -136,7 +136,6 @@ struct mng_data_t
gint32 default_dispose;
};
/* Values of the instance of the above struct when the plug-in is
* first invoked. */
@ -160,6 +159,21 @@ static struct mng_data_t mng_data =
};
/* These are not saved or restored. */
struct mng_globals_t
{
gboolean has_trns;
png_bytep trans;
int num_trans;
gboolean has_plte;
png_colorp palette;
int num_palette;
};
static struct mng_globals_t mngg;
/* The output FILE pointer which is used by libmng;
* passed around as user data. */
struct mnglib_userdata_t
@ -478,10 +492,13 @@ respin_cmap (png_structp pp,
if (transparent != -1)
{
png_color palette[256] = { {0, 0, 0} };
static png_color palette[256] = { {0, 0, 0} };
gint i;
png_set_tRNS (pp, info, (png_bytep) trans, 1, NULL);
/* Set tRNS chunk values for writing later. */
mngg.has_trns = TRUE;
mngg.trans = trans;
mngg.num_trans = 1;
/* Transform all pixels with a value = transparent to
* 0 and vice versa to compensate for re-ordering in palette
@ -503,7 +520,11 @@ respin_cmap (png_structp pp,
palette[i].blue = before[3 * remap[i] + 2];
}
png_set_PLTE (pp, info, (png_colorp) palette, colors);
/* Set PLTE chunk values for writing later. */
mngg.has_plte = TRUE;
mngg.palette = palette;
mngg.num_palette = colors;
*bit_depth = get_bit_depth_for_palette (colors);
return TRUE;
@ -515,7 +536,9 @@ respin_cmap (png_structp pp,
}
}
png_set_PLTE (pp, info, (png_colorp) before, colors);
mngg.has_plte = TRUE;
mngg.palette = (png_colorp) before;
mngg.num_palette = colors;
*bit_depth = get_bit_depth_for_palette (colors);
return FALSE;
@ -793,7 +816,6 @@ mng_save_image (const gchar *filename,
for (i = (num_layers - 1); i >= 0; i--)
{
gint num_colors;
GimpImageType layer_drawable_type;
GimpDrawable *layer_drawable;
gint layer_offset_x, layer_offset_y;
@ -822,7 +844,6 @@ mng_save_image (const gchar *filename,
guchar layer_remap[256];
int color_type;
int bit_depth;
png_colorp palette;
layer_name = gimp_item_get_name (layers[i]);
layer_chunks_type = parse_chunks_type_from_layer_name (layer_name);
@ -1017,9 +1038,9 @@ mng_save_image (const gchar *filename,
break;
case GIMP_INDEXED_IMAGE:
color_type = PNG_COLOR_TYPE_PALETTE;
palette = (png_colorp) gimp_image_get_colormap (image_id, &num_colors);
png_set_PLTE (pp, info, palette, num_colors);
bit_depth = get_bit_depth_for_palette (num_colors);
mngg.has_plte = TRUE;
mngg.palette = (png_colorp) gimp_image_get_colormap (image_id, &mngg.num_palette);
bit_depth = get_bit_depth_for_palette (mngg.num_palette);
break;
case GIMP_INDEXEDA_IMAGE:
color_type = PNG_COLOR_TYPE_PALETTE;
@ -1036,12 +1057,25 @@ mng_save_image (const gchar *filename,
goto err3;
}
/* Note: png_set_IHDR() must be called before any other
png_set_*() functions. */
png_set_IHDR (pp, info, layer_cols, layer_rows,
bit_depth,
color_type,
mng_data.interlaced ? PNG_INTERLACE_ADAM7 : PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
if (mngg.has_trns)
{
png_set_tRNS (pp, info, mngg.trans, mngg.num_trans, NULL);
}
if (mngg.has_plte)
{
png_set_PLTE (pp, info, mngg.palette, mngg.num_palette);
}
png_set_compression_level (pp, mng_data.compression_level);
png_write_info (pp, info);