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Write PNG image data directly to wxImage buffer when possible

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If there is no alpha or mask, copying from an intermediate buffer is not necessary.
This commit is contained in:
Paul Cornett
2019-09-03 11:12:20 -07:00
parent 991f11707f
commit 560c247feb
1 changed files with 23 additions and 18 deletions
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41
src/common/imagpng.cpp
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@@ -113,18 +113,27 @@ struct wxPNGImageData
ok = false;
}
bool Alloc(png_uint_32 width, png_uint_32 height)
bool Alloc(png_uint_32 width, png_uint_32 height, unsigned char* buf)
{
lines = (unsigned char **)malloc(height * sizeof(unsigned char *));
if ( !lines )
return false;
const size_t w = width * size_t(4);
m_buf = static_cast<unsigned char*>(malloc(w * height));
if (!m_buf)
return false;
size_t w = width;
// if RGB data will be written directly to wxImage buffer
if (buf)
w *= 3;
else
{
// allocate intermediate RGBA buffer
w *= 4;
buf =
m_buf = static_cast<unsigned char*>(malloc(w * height));
if (!m_buf)
return false;
}
lines[0] = m_buf;
lines[0] = buf;
for (png_uint_32 i = 1; i < height; i++)
lines[i] = lines[i - 1] + w;
@@ -316,26 +325,21 @@ wxPNGImageData::DoLoadPNGFile(wxImage* image, wxPNGInfoStruct& wxinfo)
png_read_info( png_ptr, info_ptr );
png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, NULL, NULL, NULL );
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_expand( png_ptr );
// Fix for Bug [ 439207 ] Monochrome PNG images come up black
if (bit_depth < 8)
png_set_expand( png_ptr );
png_set_expand(png_ptr);
png_set_gray_to_rgb(png_ptr);
png_set_strip_16( png_ptr );
png_set_packing( png_ptr );
if (png_get_valid( png_ptr, info_ptr, PNG_INFO_tRNS))
png_set_expand( png_ptr );
png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
image->Create((int)width, (int)height, (bool) false /* no need to init pixels */);
if (!image->IsOk())
return;
if ( !Alloc(width, height) )
const bool needCopy =
(color_type & PNG_COLOR_MASK_ALPHA) ||
png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS);
if (!Alloc(width, height, needCopy ? NULL : image->GetData()))
return;
png_read_image( png_ptr, lines );
@@ -409,7 +413,8 @@ wxPNGImageData::DoLoadPNGFile(wxImage* image, wxPNGInfoStruct& wxinfo)
// loaded successfully, now init wxImage with this data
CopyDataFromPNG(image, lines, width, height);
if (needCopy)
CopyDataFromPNG(image, lines, width, height);
// This will indicate to the caller that loading succeeded.
ok = true;