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neaten up the code for reading bitmap pixels :)

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This commit is contained in:
XANTRONIX 2021-12-04 17:13:14 -05:00
parent ea96b298b3
commit 0fca3e3d43
1 changed files with 27 additions and 11 deletions
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38
src/image.c
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@ -104,22 +104,37 @@ static uint8_t rgb_to_2bpp(uint8_t r, uint8_t g, uint8_t b, size_t x, size_t y)
return (slot & (0x8000 >> ((y & 3) << 2) >> (x & 3)))? to: from;
}
static inline uint8_t bitmap_read_channel(uint8_t *buf,
size_t x, size_t y, size_t stride,
int channels,
int channel) {
return buf[channels*stride*y + channels*x + channel];
}
static inline void bitmap_read(uint8_t *buf,
size_t x, size_t y, size_t stride,
uint8_t *r, uint8_t *g, uint8_t *b,
int channels) {
*r = buf[channels*stride*y + channels*x];
*g = buf[channels*stride*y + channels*x + 1];
*b = buf[channels*stride*y + channels*x + 2];
*r = bitmap_read_channel(buf, x, y, stride, channels, 0);
*r = bitmap_read_channel(buf, x, y, stride, channels, 1);
*r = bitmap_read_channel(buf, x, y, stride, channels, 2);
}
static inline void bitmap_write_channel(uint8_t *buf,
size_t x, size_t y, size_t stride,
int channels,
int channel,
uint8_t v) {
buf[channels*stride*y + channels*x + channel] = v;
}
static inline void bitmap_write(uint8_t *buf,
size_t x, size_t y, size_t stride,
uint8_t r, uint8_t g, uint8_t b,
int channels) {
buf[channels*stride*y + channels*x] = r;
buf[channels*stride*y + channels*x + 1] = g;
buf[channels*stride*y + channels*x + 2] = b;
int channels,
uint8_t r, uint8_t g, uint8_t b) {
bitmap_write_channel(buf, x, y, stride, channels, 0, r);
bitmap_write_channel(buf, x, y, stride, channels, 1, g);
bitmap_write_channel(buf, x, y, stride, channels, 2, b);
}
static inline size_t size_2bpp_tile(size_t width, size_t height) {
@ -547,7 +562,8 @@ static void bitmap_copy(cammy_image *dest,
to->x + x,
to->y + y,
dest->width,
r, g, b, channels_dest);
channels_dest,
r, g, b);
}
}
}
@ -614,10 +630,10 @@ static void tile_copy_to_bitmap(cammy_image *dest,
x,
y,
from->width,
channels,
src->palette[c].r,
src->palette[c].g,
src->palette[c].b,
channels);
src->palette[c].b);
}
}
}