diff options
Diffstat (limited to 'src/plugins/graphicssystems/meego/dithering.cpp')
| -rw-r--r-- | src/plugins/graphicssystems/meego/dithering.cpp | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/src/plugins/graphicssystems/meego/dithering.cpp b/src/plugins/graphicssystems/meego/dithering.cpp index c0b4b53..76d15a3 100644 --- a/src/plugins/graphicssystems/meego/dithering.cpp +++ b/src/plugins/graphicssystems/meego/dithering.cpp @@ -68,7 +68,7 @@ // Writes(ads) a new value to the diffusion accumulator. accumulator is a short. // x, y is a position in the accumulation buffer. y can be 0 or 1 -- we operate on two lines at time. -#define ACCUMULATE(accumulator, x, y, width, v) if (x < width && x > 0) accumulator[(y * width) + x] += v +#define ACCUMULATE(accumulator, x, y, width, v) if (x < width && x >= 0) accumulator[(y * width) + x] += v // Clamps a value to be in 0..255 range. #define CLAMP_256(v) if (v > 255) v = 255; if (v < 0) v = 0; @@ -110,18 +110,18 @@ unsigned short* convertRGB32_to_RGB565(const unsigned char *in, int width, int h // Produce the conversion lookup tables. for (i = 0; i < 256; i++) { lookup_8bit_to_5bit[i] = round(i / 8.0); - if (lookup_8bit_to_5bit[i] > 31) - lookup_8bit_to_5bit[i] -= 1; // Before bitshifts: (i * 8) - (... * 8 * 8) lookup_8bit_to_5bit_diff[i] = (i << 3) - (lookup_8bit_to_5bit[i] << 6); + if (lookup_8bit_to_5bit[i] > 31) + lookup_8bit_to_5bit[i] -= 1; lookup_8bit_to_6bit[i] = round(i / 4.0); - if (lookup_8bit_to_6bit[i] > 63) - lookup_8bit_to_6bit[i] -= 1; // Before bitshifts: (i * 8) - (... * 4 * 8) lookup_8bit_to_6bit_diff[i] = (i << 3) - (lookup_8bit_to_6bit[i] << 5); + if (lookup_8bit_to_6bit[i] > 63) + lookup_8bit_to_6bit[i] -= 1; } // Clear the accumulators @@ -221,11 +221,11 @@ unsigned short* convertARGB32_to_RGBA4444(const unsigned char *in, int width, in // Produce the conversion lookup tables. for (i = 0; i < 256; i++) { lookup_8bit_to_4bit[i] = round(i / 16.0); - if (lookup_8bit_to_4bit[i] > 15) - lookup_8bit_to_4bit[i] -= 1; - // Before bitshifts: (i * 8) - (... * 16 * 8) lookup_8bit_to_4bit_diff[i] = (i << 3) - (lookup_8bit_to_4bit[i] << 7); + + if (lookup_8bit_to_4bit[i] > 15) + lookup_8bit_to_4bit[i] = 15; } // Clear the accumulators |