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Load_PNG(): add debug messages and code comments

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This commit is contained in:
Thomas Bernard 2019-06-29 10:25:57 +02:00
parent a59aab8a31
commit 836ad157fa
1 changed files with 13 additions and 6 deletions
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19
src/fileformats.c
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@ -6568,8 +6568,13 @@ void Load_PNG_Sub(T_IO_Context * context, FILE * file, const char * memory_buffe
while (num_text--)
{
int size = COMMENT_SIZE;
if (text_ptr[num_text].text_length > 0 && text_ptr[num_text].text_length < COMMENT_SIZE)
size = text_ptr[num_text].text_length;
size_t length = (text_ptr[num_text].compression >= 1) ? text_ptr[num_text].itxt_length : text_ptr[num_text].text_length;
if (length > 0 && length < COMMENT_SIZE)
size = (int)length;
GFX2_Log(GFX2_DEBUG, "PNG Text %d \"%s\" (%ul bytes): %.*s\n",
text_ptr[num_text].compression, text_ptr[num_text].key,
(unsigned long)length,
(int)MIN(length, 160), text_ptr[num_text].text);
if (strcmp(text_ptr[num_text].key,"Title") == 0)
{
strncpy(context->Comment, text_ptr[num_text].text, size);
@ -6591,6 +6596,9 @@ void Load_PNG_Sub(T_IO_Context * context, FILE * file, const char * memory_buffe
// WIDE or TALL pixels
if (res_x>0 && res_y>0)
{
GFX2_Log(GFX2_DEBUG, "PNG pHYs unit %d %dx%d\n", unit_type, res_x, res_y);
if (unit_type == 1)
GFX2_Log(GFX2_DEBUG, " %dx%d DPI\n", (res_x * 254 + 5000) / 10000, (res_y * 254 + 5000) / 10000);
if (res_y * 10 > res_x * 12) // X/Y < 1/1.2
ratio = PIXEL_WIDE;
else if (res_x * 10 > res_y * 12) // X/Y > 1.2
@ -6681,11 +6689,13 @@ void Load_PNG_Sub(T_IO_Context * context, FILE * file, const char * memory_buffe
// Transparency (tRNS)
if (png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, &trans_values))
{
GFX2_Log(GFX2_DEBUG, "PNG transparency %d %p %p\n", num_trans, trans, trans_values);
if (color_type == PNG_COLOR_TYPE_PALETTE && trans!=NULL)
{
int i;
for (i=0; i<num_trans; i++)
{
// Look for the first color with alpha = 0 (full transparency)
if (trans[i]==0)
{
context->Transparent_color = i;
@ -6710,10 +6720,7 @@ void Load_PNG_Sub(T_IO_Context * context, FILE * file, const char * memory_buffe
}
}
context->Width=png_get_image_width(png_ptr,info_ptr);
context->Height=png_get_image_height(png_ptr,info_ptr);
png_set_interlace_handling(png_ptr);
png_set_interlace_handling(png_ptr); // return number of image passes (7 for interlaced images)
png_read_update_info(png_ptr, info_ptr);
// Allocate row pointers