1 /*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkBlitMask.h"
9 #include "SkColor.h"
10 #include "SkColorData.h"
11 #include "SkOpts.h"
12
BlitLCD16RowFactory(bool isOpaque)13 SkBlitMask::BlitLCD16RowProc SkBlitMask::BlitLCD16RowFactory(bool isOpaque) {
14 BlitLCD16RowProc proc = PlatformBlitRowProcs16(isOpaque);
15 if (proc) {
16 return proc;
17 }
18
19 if (isOpaque) {
20 return SkBlitLCD16OpaqueRow;
21 } else {
22 return SkBlitLCD16Row;
23 }
24 }
25
D32_LCD16_Proc(void * SK_RESTRICT dst,size_t dstRB,const void * SK_RESTRICT mask,size_t maskRB,SkColor color,int width,int height)26 static void D32_LCD16_Proc(void* SK_RESTRICT dst, size_t dstRB,
27 const void* SK_RESTRICT mask, size_t maskRB,
28 SkColor color, int width, int height) {
29
30 SkPMColor* dstRow = (SkPMColor*)dst;
31 const uint16_t* srcRow = (const uint16_t*)mask;
32 SkPMColor opaqueDst;
33
34 SkBlitMask::BlitLCD16RowProc proc = nullptr;
35 bool isOpaque = (0xFF == SkColorGetA(color));
36 proc = SkBlitMask::BlitLCD16RowFactory(isOpaque);
37 SkASSERT(proc != nullptr);
38
39 if (isOpaque) {
40 opaqueDst = SkPreMultiplyColor(color);
41 } else {
42 opaqueDst = 0; // ignored
43 }
44
45 do {
46 proc(dstRow, srcRow, color, width, opaqueDst);
47 dstRow = (SkPMColor*)((char*)dstRow + dstRB);
48 srcRow = (const uint16_t*)((const char*)srcRow + maskRB);
49 } while (--height != 0);
50 }
51
52 ///////////////////////////////////////////////////////////////////////////////
53
BlitColor(const SkPixmap & device,const SkMask & mask,const SkIRect & clip,SkColor color)54 bool SkBlitMask::BlitColor(const SkPixmap& device, const SkMask& mask,
55 const SkIRect& clip, SkColor color) {
56 int x = clip.fLeft, y = clip.fTop;
57
58 if (device.colorType() == kN32_SkColorType && mask.fFormat == SkMask::kA8_Format) {
59 SkOpts::blit_mask_d32_a8(device.writable_addr32(x,y), device.rowBytes(),
60 (const SkAlpha*)mask.getAddr(x,y), mask.fRowBytes,
61 color, clip.width(), clip.height());
62 return true;
63 }
64
65 if (device.colorType() == kN32_SkColorType && mask.fFormat == SkMask::kLCD16_Format) {
66 // TODO: Is this reachable code? Seems like no.
67 D32_LCD16_Proc(device.writable_addr32(x,y), device.rowBytes(),
68 mask.getAddr(x,y), mask.fRowBytes,
69 color, clip.width(), clip.height());
70 return true;
71 }
72
73 return false;
74 }
75
76 ///////////////////////////////////////////////////////////////////////////////
77 ///////////////////////////////////////////////////////////////////////////////
78
BW_RowProc_Blend(SkPMColor * SK_RESTRICT dst,const void * maskIn,const SkPMColor * SK_RESTRICT src,int count)79 static void BW_RowProc_Blend(
80 SkPMColor* SK_RESTRICT dst, const void* maskIn, const SkPMColor* SK_RESTRICT src, int count) {
81 const uint8_t* SK_RESTRICT mask = static_cast<const uint8_t*>(maskIn);
82 int i, octuple = (count + 7) >> 3;
83 for (i = 0; i < octuple; ++i) {
84 int m = *mask++;
85 if (m & 0x80) { dst[0] = SkPMSrcOver(src[0], dst[0]); }
86 if (m & 0x40) { dst[1] = SkPMSrcOver(src[1], dst[1]); }
87 if (m & 0x20) { dst[2] = SkPMSrcOver(src[2], dst[2]); }
88 if (m & 0x10) { dst[3] = SkPMSrcOver(src[3], dst[3]); }
89 if (m & 0x08) { dst[4] = SkPMSrcOver(src[4], dst[4]); }
90 if (m & 0x04) { dst[5] = SkPMSrcOver(src[5], dst[5]); }
91 if (m & 0x02) { dst[6] = SkPMSrcOver(src[6], dst[6]); }
92 if (m & 0x01) { dst[7] = SkPMSrcOver(src[7], dst[7]); }
93 src += 8;
94 dst += 8;
95 }
96 count &= 7;
97 if (count > 0) {
98 int m = *mask;
99 do {
100 if (m & 0x80) { dst[0] = SkPMSrcOver(src[0], dst[0]); }
101 m <<= 1;
102 src += 1;
103 dst += 1;
104 } while (--count > 0);
105 }
106 }
107
BW_RowProc_Opaque(SkPMColor * SK_RESTRICT dst,const void * maskIn,const SkPMColor * SK_RESTRICT src,int count)108 static void BW_RowProc_Opaque(
109 SkPMColor* SK_RESTRICT dst, const void* maskIn, const SkPMColor* SK_RESTRICT src, int count) {
110 const uint8_t* SK_RESTRICT mask = static_cast<const uint8_t*>(maskIn);
111 int i, octuple = (count + 7) >> 3;
112 for (i = 0; i < octuple; ++i) {
113 int m = *mask++;
114 if (m & 0x80) { dst[0] = src[0]; }
115 if (m & 0x40) { dst[1] = src[1]; }
116 if (m & 0x20) { dst[2] = src[2]; }
117 if (m & 0x10) { dst[3] = src[3]; }
118 if (m & 0x08) { dst[4] = src[4]; }
119 if (m & 0x04) { dst[5] = src[5]; }
120 if (m & 0x02) { dst[6] = src[6]; }
121 if (m & 0x01) { dst[7] = src[7]; }
122 src += 8;
123 dst += 8;
124 }
125 count &= 7;
126 if (count > 0) {
127 int m = *mask;
128 do {
129 if (m & 0x80) { dst[0] = SkPMSrcOver(src[0], dst[0]); }
130 m <<= 1;
131 src += 1;
132 dst += 1;
133 } while (--count > 0);
134 }
135 }
136
A8_RowProc_Blend(SkPMColor * SK_RESTRICT dst,const void * maskIn,const SkPMColor * SK_RESTRICT src,int count)137 static void A8_RowProc_Blend(
138 SkPMColor* SK_RESTRICT dst, const void* maskIn, const SkPMColor* SK_RESTRICT src, int count) {
139 const uint8_t* SK_RESTRICT mask = static_cast<const uint8_t*>(maskIn);
140 for (int i = 0; i < count; ++i) {
141 if (mask[i]) {
142 dst[i] = SkBlendARGB32(src[i], dst[i], mask[i]);
143 }
144 }
145 }
146
A8_RowProc_Opaque(SkPMColor * SK_RESTRICT dst,const void * maskIn,const SkPMColor * SK_RESTRICT src,int count)147 static void A8_RowProc_Opaque(
148 SkPMColor* SK_RESTRICT dst, const void* maskIn, const SkPMColor* SK_RESTRICT src, int count) {
149 const uint8_t* SK_RESTRICT mask = static_cast<const uint8_t*>(maskIn);
150 for (int i = 0; i < count; ++i) {
151 int m = mask[i];
152 if (m) {
153 m += (m >> 7);
154 dst[i] = SkPMLerp(src[i], dst[i], m);
155 }
156 }
157 }
158
upscale31To255(int value)159 static int upscale31To255(int value) {
160 value = (value << 3) | (value >> 2);
161 return value;
162 }
163
src_alpha_blend(int src,int dst,int srcA,int mask)164 static int src_alpha_blend(int src, int dst, int srcA, int mask) {
165
166 return dst + SkAlphaMul(src - SkAlphaMul(srcA, dst), mask);
167 }
168
LCD16_RowProc_Blend(SkPMColor * SK_RESTRICT dst,const void * maskIn,const SkPMColor * SK_RESTRICT src,int count)169 static void LCD16_RowProc_Blend(
170 SkPMColor* SK_RESTRICT dst, const void* maskIn, const SkPMColor* SK_RESTRICT src, int count) {
171 const uint16_t* SK_RESTRICT mask = static_cast<const uint16_t*>(maskIn);
172 for (int i = 0; i < count; ++i) {
173 uint16_t m = mask[i];
174 if (0 == m) {
175 continue;
176 }
177
178 SkPMColor s = src[i];
179 SkPMColor d = dst[i];
180
181 int srcA = SkGetPackedA32(s);
182 int srcR = SkGetPackedR32(s);
183 int srcG = SkGetPackedG32(s);
184 int srcB = SkGetPackedB32(s);
185
186 srcA += srcA >> 7;
187
188 /* We want all of these in 5bits, hence the shifts in case one of them
189 * (green) is 6bits.
190 */
191 int maskR = SkGetPackedR16(m) >> (SK_R16_BITS - 5);
192 int maskG = SkGetPackedG16(m) >> (SK_G16_BITS - 5);
193 int maskB = SkGetPackedB16(m) >> (SK_B16_BITS - 5);
194
195 maskR = upscale31To255(maskR);
196 maskG = upscale31To255(maskG);
197 maskB = upscale31To255(maskB);
198
199 int dstR = SkGetPackedR32(d);
200 int dstG = SkGetPackedG32(d);
201 int dstB = SkGetPackedB32(d);
202
203 // LCD blitting is only supported if the dst is known/required
204 // to be opaque
205 dst[i] = SkPackARGB32(0xFF,
206 src_alpha_blend(srcR, dstR, srcA, maskR),
207 src_alpha_blend(srcG, dstG, srcA, maskG),
208 src_alpha_blend(srcB, dstB, srcA, maskB));
209 }
210 }
211
LCD16_RowProc_Opaque(SkPMColor * SK_RESTRICT dst,const void * maskIn,const SkPMColor * SK_RESTRICT src,int count)212 static void LCD16_RowProc_Opaque(
213 SkPMColor* SK_RESTRICT dst, const void* maskIn, const SkPMColor* SK_RESTRICT src, int count) {
214 const uint16_t* SK_RESTRICT mask = static_cast<const uint16_t*>(maskIn);
215 for (int i = 0; i < count; ++i) {
216 uint16_t m = mask[i];
217 if (0 == m) {
218 continue;
219 }
220
221 SkPMColor s = src[i];
222 SkPMColor d = dst[i];
223
224 int srcR = SkGetPackedR32(s);
225 int srcG = SkGetPackedG32(s);
226 int srcB = SkGetPackedB32(s);
227
228 /* We want all of these in 5bits, hence the shifts in case one of them
229 * (green) is 6bits.
230 */
231 int maskR = SkGetPackedR16(m) >> (SK_R16_BITS - 5);
232 int maskG = SkGetPackedG16(m) >> (SK_G16_BITS - 5);
233 int maskB = SkGetPackedB16(m) >> (SK_B16_BITS - 5);
234
235 // Now upscale them to 0..32, so we can use blend32
236 maskR = SkUpscale31To32(maskR);
237 maskG = SkUpscale31To32(maskG);
238 maskB = SkUpscale31To32(maskB);
239
240 int dstR = SkGetPackedR32(d);
241 int dstG = SkGetPackedG32(d);
242 int dstB = SkGetPackedB32(d);
243
244 // LCD blitting is only supported if the dst is known/required
245 // to be opaque
246 dst[i] = SkPackARGB32(0xFF,
247 SkBlend32(srcR, dstR, maskR),
248 SkBlend32(srcG, dstG, maskG),
249 SkBlend32(srcB, dstB, maskB));
250 }
251 }
252
RowFactory(SkColorType ct,SkMask::Format format,RowFlags flags)253 SkBlitMask::RowProc SkBlitMask::RowFactory(SkColorType ct,
254 SkMask::Format format,
255 RowFlags flags) {
256 // make this opt-in until chrome can rebaseline
257 RowProc proc = PlatformRowProcs(ct, format, flags);
258 if (proc) {
259 return proc;
260 }
261
262 static const RowProc gProcs[] = {
263 // need X coordinate to handle BW
264 false ? (RowProc)BW_RowProc_Blend : nullptr, // suppress unused warning
265 false ? (RowProc)BW_RowProc_Opaque : nullptr, // suppress unused warning
266 (RowProc)A8_RowProc_Blend, (RowProc)A8_RowProc_Opaque,
267 (RowProc)LCD16_RowProc_Blend, (RowProc)LCD16_RowProc_Opaque,
268 };
269
270 int index;
271 switch (ct) {
272 case kN32_SkColorType:
273 switch (format) {
274 case SkMask::kBW_Format: index = 0; break;
275 case SkMask::kA8_Format: index = 2; break;
276 case SkMask::kLCD16_Format: index = 4; break;
277 default:
278 return nullptr;
279 }
280 if (flags & kSrcIsOpaque_RowFlag) {
281 index |= 1;
282 }
283 SkASSERT((size_t)index < SK_ARRAY_COUNT(gProcs));
284 return gProcs[index];
285 default:
286 break;
287 }
288 return nullptr;
289 }
290