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Minor refactor on old macros within BMP format

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This commit is contained in:
Gaspar Capello 2022-08-30 14:44:04 -03:00
parent 877b5e00a3
commit 277e24c799
1 changed files with 30 additions and 26 deletions
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56
src/app/file/bmp_format.cpp
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@ -874,32 +874,36 @@ static void read_rle4_compressed_image(FILE *f, Image *image, const BITMAPINFOHE
}
}
static uint32_t calc_shift(const uint32_t channelMask, int& channelBits)
{
uint32_t channelShift = 0;
uint32_t mask = 0;
if (channelMask) {
mask = ~channelMask;
while (mask & 1) {
++channelShift;
mask >>= 1;
}
if (mask) {
mask = ~mask;
while (mask & 1) {
channelBits++;
mask >>= 1;
}
}
else
channelBits = 32 - channelShift;
}
else
channelBits = 8;
return channelShift;
}
static int read_bitfields_image(FILE *f, Image *image, BITMAPINFOHEADER *infoheader,
uint32_t rmask, uint32_t gmask, uint32_t bmask,
uint32_t amask, bool& withAlpha)
{
#define CALC_SHIFT(c) \
c##shift = 0; \
if (c##mask) { \
mask = ~c##mask; \
while (mask & 1) { \
++c##shift; \
mask >>= 1; \
} \
if (mask) { \
mask = ~mask; \
while (mask & 1) { \
c##bits++; \
mask >>= 1; \
} \
} \
else \
c##bits = 32 - c##shift; \
} \
else \
c##bits = 8; \
uint32_t buffer, mask, rshift, gshift, bshift, ashift;
uint32_t buffer, rshift, gshift, bshift, ashift;
int rbits = 0, gbits = 0, bbits = 0, abits = 0;
int i, j, k, line, height, dir, r, g, b, a;
int bits_per_pixel;
@ -911,10 +915,10 @@ static int read_bitfields_image(FILE *f, Image *image, BITMAPINFOHEADER *infohea
height = ABS(height);
/* calculate shifts */
CALC_SHIFT(r);
CALC_SHIFT(g);
CALC_SHIFT(b);
CALC_SHIFT(a);
rshift = calc_shift(rmask, rbits);
gshift = calc_shift(gmask, gbits);
bshift = calc_shift(bmask, bbits);
ashift = calc_shift(amask, abits);
/* calculate bits-per-pixel and bytes-per-pixel */
bits_per_pixel = infoheader->biBitCount;