16 #define RB_MASK_PLUS_ONE
18 #define Alpha(x) ((x) >> A_SHIFT)
24 #define IntMult(a,b,t) ( (t) = (a) * (b) + ONE_HALF, ( ( ( (t)>>G_SHIFT ) + (t) )>>G_SHIFT ) )
25 #define IntDiv(a,b) (((comp2_t) (a) * MASK) / (b))
26 #define IntAdd(x,y,t) ( \
28 (comp4_t) (comp1_t) ((t) | (0 - ((t) >> G_SHIFT))))
30 #define DivOne(x) (((x) + ONE_HALF + (((x) + ONE_HALF) >> G_SHIFT)) >> G_SHIFT)
33 The methods below use some tricks to be able to do two color
34 components at the same time.
40 #define FbByteMul(x, a) do { \
41 comp4_t t = ((x & RB_MASK) * a) + RB_ONE_HALF; \
42 t = (t + ((t >> COMPONENT_SIZE) & RB_MASK)) >> COMPONENT_SIZE; \
45 x = (((x >> COMPONENT_SIZE) & RB_MASK) * a) + RB_ONE_HALF; \
46 x = (x + ((x >> COMPONENT_SIZE) & RB_MASK)); \
47 x &= RB_MASK << COMPONENT_SIZE; \
52 x_c = (x_c * a) / 255 + y
54 #define FbByteMulAdd(x, a, y) do { \
55 /* multiply and divide: trunc((i + 128)*257/65536) */ \
56 comp4_t t = ((x & RB_MASK) * a) + RB_ONE_HALF; \
57 t = (t + ((t >> COMPONENT_SIZE) & RB_MASK)) >> COMPONENT_SIZE; \
64 t |= RB_MASK_PLUS_ONE - ((t >> COMPONENT_SIZE) & RB_MASK); \
67 /* multiply and divide */ \
68 x = (((x >> COMPONENT_SIZE) & RB_MASK) * a) + RB_ONE_HALF; \
69 x = (x + ((x >> COMPONENT_SIZE) & RB_MASK)) >> COMPONENT_SIZE; \
73 x += (y >> COMPONENT_SIZE) & RB_MASK; \
76 x |= RB_MASK_PLUS_ONE - ((x >> COMPONENT_SIZE) & RB_MASK); \
80 x <<= COMPONENT_SIZE; \
85 x_c = (x_c * a + y_c * b) / 255
87 #define FbByteAddMul(x, a, y, b) do { \
89 comp4_t r = (x >> A_SHIFT) * a + (y >> A_SHIFT) * b + ONE_HALF; \
90 r += (r >> G_SHIFT); \
93 t = (x & G_MASK) * a + (y & G_MASK) * b; \
94 t += (t >> G_SHIFT) + (ONE_HALF << G_SHIFT); \
98 t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK); \
102 r = ((x >> R_SHIFT) & MASK) * a + \
103 ((y >> R_SHIFT) & MASK) * b + ONE_HALF; \
104 r += (r >> G_SHIFT); \
107 x = (x & MASK) * a + (y & MASK) * b + ONE_HALF; \
108 x += (x >> G_SHIFT); \
111 x |= RB_MASK_PLUS_ONE - ((x >> G_SHIFT) & RB_MASK); \
117 x_c = (x_c * a_c) / 255
119 #define FbByteMulC(x, a) do { \
121 comp4_t r = (x & MASK) * (a & MASK); \
122 r |= (x & R_MASK) * ((a >> R_SHIFT) & MASK); \
124 r = (r + ((r >> G_SHIFT) & RB_MASK)) >> G_SHIFT; \
128 t = (x & MASK) * ((a >> G_SHIFT) & MASK); \
129 t |= (x & R_MASK) * (a >> A_SHIFT); \
131 t = t + ((t >> G_SHIFT) & RB_MASK); \
132 x = r | (t & AG_MASK); \
136 x_c = (x_c * a_c) / 255 + y
138 #define FbByteMulAddC(x, a, y) do { \
140 comp4_t r = (x & MASK) * (a & MASK); \
141 r |= (x & R_MASK) * ((a >> R_SHIFT) & MASK); \
143 r = (r + ((r >> G_SHIFT) & RB_MASK)) >> G_SHIFT; \
146 r |= RB_MASK_PLUS_ONE - ((r >> G_SHIFT) & RB_MASK); \
150 t = (x & MASK) * ((a >> G_SHIFT) & MASK); \
151 t |= (x & R_MASK) * (a >> A_SHIFT); \
153 t = (t + ((t >> G_SHIFT) & RB_MASK)) >> G_SHIFT; \
155 t += (y >> G_SHIFT) & RB_MASK; \
156 t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK); \
158 x = r | (t << G_SHIFT); \
162 x_c = (x_c * a_c + y_c * b) / 255
164 #define FbByteAddMulC(x, a, y, b) do { \
166 comp4_t r = (x >> A_SHIFT) * (a >> A_SHIFT) + \
167 (y >> A_SHIFT) * b; \
168 r += (r >> G_SHIFT) + ONE_HALF; \
171 t = (x & G_MASK) * ((a >> G_SHIFT) & MASK) + (y & G_MASK) * b; \
172 t += (t >> G_SHIFT) + (ONE_HALF << G_SHIFT); \
176 t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK); \
180 r = ((x >> R_SHIFT) & MASK) * ((a >> R_SHIFT) & MASK) + \
181 ((y >> R_SHIFT) & MASK) * b + ONE_HALF; \
182 r += (r >> G_SHIFT); \
185 x = (x & MASK) * (a & MASK) + (y & MASK) * b + ONE_HALF; \
186 x += (x >> G_SHIFT); \
189 x |= RB_MASK_PLUS_ONE - ((x >> G_SHIFT) & RB_MASK); \
195 x_c = min(x_c + y_c, 255)
197 #define FbByteAdd(x, y) do { \
199 comp4_t r = (x & RB_MASK) + (y & RB_MASK); \
200 r |= RB_MASK_PLUS_ONE - ((r >> G_SHIFT) & RB_MASK); \
203 t = ((x >> G_SHIFT) & RB_MASK) + ((y >> G_SHIFT) & RB_MASK); \
204 t |= RB_MASK_PLUS_ONE - ((t >> G_SHIFT) & RB_MASK); \
205 r |= (t & RB_MASK) << G_SHIFT; \