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Add comments and DLOG() calls in gif_format.cpp

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This commit is contained in:
David Capello 2015-09-24 23:49:01 -03:00
parent 5a339f7f55
commit 43881af1f2
1 changed files with 39 additions and 6 deletions
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45
src/app/file/gif_format.cpp
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@ -189,7 +189,10 @@ public:
, m_remap(256)
, m_hasLocalColormaps(false)
, m_firstLocalColormap(nullptr) {
DLOG("[GifDecoder] GIF background index = %d\n", (int)m_gifFile->SBackGroundColor);
DLOG("[GifDecoder] GIF background index=%d\n", (int)m_gifFile->SBackGroundColor);
DLOG("[GifDecoder] GIF global colormap=%d, ncolors=%d\n",
(m_gifFile->SColorMap ? 1: 0),
(m_gifFile->SColorMap ? m_gifFile->SColorMap->ColorCount: 0));
}
~GifDecoder() {
@ -322,6 +325,9 @@ private:
// Convert the sprite to RGB if we have more than 256 colors
if ((m_sprite->pixelFormat() == IMAGE_INDEXED) &&
(m_sprite->palette(m_frameNum)->size() > 256)) {
DLOG("[GifDecoder] Converting to RGB because we have %d colors\n",
m_sprite->palette(m_frameNum)->size());
convertIndexedSpriteToRgb();
}
@ -438,7 +444,10 @@ private:
int ncolors = colormap->ColorCount;
bool isLocalColormap = (m_gifFile->Image.ColorMap ? true: false);
// Get the list of used palette entries
DLOG("[GifDecoder] Local colormap=%d, ncolors=%d\n", isLocalColormap, ncolors);
// We'll calculate the list of used colormap indexes in this
// frameImage.
PalettePicks usedEntries(ncolors);
if (isLocalColormap) {
// With this we avoid discarding the transparent index when a
@ -454,10 +463,12 @@ private:
usedEntries[i] = true;
}
}
// Used all entries if the colormap is global
else
// Mark all entries as used if the colormap is global.
else {
usedEntries.all();
}
// Number of colors (indexes) used in the frame image.
int usedNColors = usedEntries.picks();
// Check if we need an extra color equal to the bg color in a
@ -486,6 +497,8 @@ private:
}
resetRemap(MAX(ncolors, palette->size()));
// Number of colors in the colormap that are part of the current
// sprite palette.
int found = 0;
if (m_frameNum > 0) {
for (int i=0; i<ncolors; ++i) {
@ -504,12 +517,32 @@ private:
}
}
// All needed colors in the colormap are present in the current
// palette.
if (found == usedNColors)
return;
Palette oldPalette(*palette);
// In other case, we need to add the missing colors...
// First index that acts like a base for new colors in palette.
int base = (m_frameNum == 0 ? 0: palette->size());
int missing = usedNColors - found;
// Number of colors in the image that aren't in the palette.
int missing = (usedNColors - found);
DLOG("[GifDecoder] Bg index=%d,\n"
" Local transparent index=%d,\n"
" Need extra index to show bg color=%d,\n "
" Found colors in palette=%d,\n"
" Used colors in local pixels=%d,\n"
" Base for new colors in palette=%d,\n"
" Colors in the image missing in the palette=%d,\n"
" New palette size=%d\n",
m_bgIndex, m_localTransparentIndex, needsExtraBgColor,
found, usedNColors, base, missing,
base + missing + (needsExtraBgColor ? 1: 0));
Palette oldPalette(*palette);
palette->resize(base + missing + (needsExtraBgColor ? 1: 0));
resetRemap(MAX(ncolors, palette->size()));