1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorPriv.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkPixelRef.h"
#include "SkErrorInternals.h"
#include "SkBitmapProcShader.h"
#if SK_SUPPORT_GPU
#include "effects/GrSimpleTextureEffect.h"
#include "effects/GrBicubicEffect.h"
#endif
bool SkBitmapProcShader::CanDo(const SkBitmap& bm, TileMode tx, TileMode ty) {
switch (bm.colorType()) {
case kAlpha_8_SkColorType:
case kRGB_565_SkColorType:
case kIndex_8_SkColorType:
case kPMColor_SkColorType:
// if (tx == ty && (kClamp_TileMode == tx || kRepeat_TileMode == tx))
return true;
default:
break;
}
return false;
}
SkBitmapProcShader::SkBitmapProcShader(const SkBitmap& src,
TileMode tmx, TileMode tmy) {
fRawBitmap = src;
fState.fTileModeX = (uint8_t)tmx;
fState.fTileModeY = (uint8_t)tmy;
fFlags = 0; // computed in setContext
}
SkBitmapProcShader::SkBitmapProcShader(SkReadBuffer& buffer)
: INHERITED(buffer) {
buffer.readBitmap(&fRawBitmap);
fRawBitmap.setImmutable();
fState.fTileModeX = buffer.readUInt();
fState.fTileModeY = buffer.readUInt();
fFlags = 0; // computed in setContext
}
SkShader::BitmapType SkBitmapProcShader::asABitmap(SkBitmap* texture,
SkMatrix* texM,
TileMode xy[]) const {
if (texture) {
*texture = fRawBitmap;
}
if (texM) {
texM->reset();
}
if (xy) {
xy[0] = (TileMode)fState.fTileModeX;
xy[1] = (TileMode)fState.fTileModeY;
}
return kDefault_BitmapType;
}
void SkBitmapProcShader::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeBitmap(fRawBitmap);
buffer.writeUInt(fState.fTileModeX);
buffer.writeUInt(fState.fTileModeY);
}
static bool only_scale_and_translate(const SkMatrix& matrix) {
unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask;
return (matrix.getType() & ~mask) == 0;
}
bool SkBitmapProcShader::isOpaque() const {
return fRawBitmap.isOpaque();
}
static bool valid_for_drawing(const SkBitmap& bm) {
if (0 == bm.width() || 0 == bm.height()) {
return false; // nothing to draw
}
if (NULL == bm.pixelRef()) {
return false; // no pixels to read
}
if (kIndex_8_SkColorType == bm.colorType()) {
// ugh, I have to lock-pixels to inspect the colortable
SkAutoLockPixels alp(bm);
if (!bm.getColorTable()) {
return false;
}
}
return true;
}
bool SkBitmapProcShader::setContext(const SkBitmap& device,
const SkPaint& paint,
const SkMatrix& matrix) {
if (!fRawBitmap.getTexture() && !valid_for_drawing(fRawBitmap)) {
return false;
}
// do this first, so we have a correct inverse matrix
if (!this->INHERITED::setContext(device, paint, matrix)) {
return false;
}
fState.fOrigBitmap = fRawBitmap;
if (!fState.chooseProcs(this->getTotalInverse(), paint)) {
this->INHERITED::endContext();
return false;
}
const SkBitmap& bitmap = *fState.fBitmap;
bool bitmapIsOpaque = bitmap.isOpaque();
// update fFlags
uint32_t flags = 0;
if (bitmapIsOpaque && (255 == this->getPaintAlpha())) {
flags |= kOpaqueAlpha_Flag;
}
switch (bitmap.colorType()) {
case kRGB_565_SkColorType:
flags |= (kHasSpan16_Flag | kIntrinsicly16_Flag);
break;
case kIndex_8_SkColorType:
case kPMColor_SkColorType:
if (bitmapIsOpaque) {
flags |= kHasSpan16_Flag;
}
break;
case kAlpha_8_SkColorType:
break; // never set kHasSpan16_Flag
default:
break;
}
if (paint.isDither() && bitmap.colorType() != kRGB_565_SkColorType) {
// gradients can auto-dither in their 16bit sampler, but we don't so
// we clear the flag here.
flags &= ~kHasSpan16_Flag;
}
// if we're only 1-pixel high, and we don't rotate, then we can claim this
if (1 == bitmap.height() &&
only_scale_and_translate(this->getTotalInverse())) {
flags |= kConstInY32_Flag;
if (flags & kHasSpan16_Flag) {
flags |= kConstInY16_Flag;
}
}
fFlags = flags;
return true;
}
void SkBitmapProcShader::endContext() {
fState.endContext();
this->INHERITED::endContext();
}
#define BUF_MAX 128
#define TEST_BUFFER_OVERRITEx
#ifdef TEST_BUFFER_OVERRITE
#define TEST_BUFFER_EXTRA 32
#define TEST_PATTERN 0x88888888
#else
#define TEST_BUFFER_EXTRA 0
#endif
void SkBitmapProcShader::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
const SkBitmapProcState& state = fState;
if (state.getShaderProc32()) {
state.getShaderProc32()(state, x, y, dstC, count);
return;
}
uint32_t buffer[BUF_MAX + TEST_BUFFER_EXTRA];
SkBitmapProcState::MatrixProc mproc = state.getMatrixProc();
SkBitmapProcState::SampleProc32 sproc = state.getSampleProc32();
int max = fState.maxCountForBufferSize(sizeof(buffer[0]) * BUF_MAX);
SkASSERT(state.fBitmap->getPixels());
SkASSERT(state.fBitmap->pixelRef() == NULL ||
state.fBitmap->pixelRef()->isLocked());
for (;;) {
int n = count;
if (n > max) {
n = max;
}
SkASSERT(n > 0 && n < BUF_MAX*2);
#ifdef TEST_BUFFER_OVERRITE
for (int i = 0; i < TEST_BUFFER_EXTRA; i++) {
buffer[BUF_MAX + i] = TEST_PATTERN;
}
#endif
mproc(state, buffer, n, x, y);
#ifdef TEST_BUFFER_OVERRITE
for (int j = 0; j < TEST_BUFFER_EXTRA; j++) {
SkASSERT(buffer[BUF_MAX + j] == TEST_PATTERN);
}
#endif
sproc(state, buffer, n, dstC);
if ((count -= n) == 0) {
break;
}
SkASSERT(count > 0);
x += n;
dstC += n;
}
}
SkShader::ShadeProc SkBitmapProcShader::asAShadeProc(void** ctx) {
if (fState.getShaderProc32()) {
*ctx = &fState;
return (ShadeProc)fState.getShaderProc32();
}
return NULL;
}
void SkBitmapProcShader::shadeSpan16(int x, int y, uint16_t dstC[], int count) {
const SkBitmapProcState& state = fState;
if (state.getShaderProc16()) {
state.getShaderProc16()(state, x, y, dstC, count);
return;
}
uint32_t buffer[BUF_MAX];
SkBitmapProcState::MatrixProc mproc = state.getMatrixProc();
SkBitmapProcState::SampleProc16 sproc = state.getSampleProc16();
int max = fState.maxCountForBufferSize(sizeof(buffer));
SkASSERT(state.fBitmap->getPixels());
SkASSERT(state.fBitmap->pixelRef() == NULL ||
state.fBitmap->pixelRef()->isLocked());
for (;;) {
int n = count;
if (n > max) {
n = max;
}
mproc(state, buffer, n, x, y);
sproc(state, buffer, n, dstC);
if ((count -= n) == 0) {
break;
}
x += n;
dstC += n;
}
}
///////////////////////////////////////////////////////////////////////////////
#include "SkUnPreMultiply.h"
#include "SkColorShader.h"
#include "SkEmptyShader.h"
// returns true and set color if the bitmap can be drawn as a single color
// (for efficiency)
static bool canUseColorShader(const SkBitmap& bm, SkColor* color) {
if (1 != bm.width() || 1 != bm.height()) {
return false;
}
SkAutoLockPixels alp(bm);
if (!bm.readyToDraw()) {
return false;
}
switch (bm.colorType()) {
case kPMColor_SkColorType:
*color = SkUnPreMultiply::PMColorToColor(*bm.getAddr32(0, 0));
return true;
case kRGB_565_SkColorType:
*color = SkPixel16ToColor(*bm.getAddr16(0, 0));
return true;
case kIndex_8_SkColorType:
*color = SkUnPreMultiply::PMColorToColor(bm.getIndex8Color(0, 0));
return true;
default: // just skip the other configs for now
break;
}
return false;
}
static bool bitmapIsTooBig(const SkBitmap& bm) {
// SkBitmapProcShader stores bitmap coordinates in a 16bit buffer, as it
// communicates between its matrix-proc and its sampler-proc. Until we can
// widen that, we have to reject bitmaps that are larger.
//
const int maxSize = 65535;
return bm.width() > maxSize || bm.height() > maxSize;
}
SkShader* CreateBitmapShader(const SkBitmap& src, SkShader::TileMode tmx,
SkShader::TileMode tmy, SkTBlitterAllocator* allocator) {
SkShader* shader;
SkColor color;
if (src.isNull() || bitmapIsTooBig(src)) {
if (NULL == allocator) {
shader = SkNEW(SkEmptyShader);
} else {
shader = allocator->createT<SkEmptyShader>();
}
}
else if (canUseColorShader(src, &color)) {
if (NULL == allocator) {
shader = SkNEW_ARGS(SkColorShader, (color));
} else {
shader = allocator->createT<SkColorShader>(color);
}
} else {
if (NULL == allocator) {
shader = SkNEW_ARGS(SkBitmapProcShader, (src, tmx, tmy));
} else {
shader = allocator->createT<SkBitmapProcShader>(src, tmx, tmy);
}
}
return shader;
}
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_DEVELOPER
void SkBitmapProcShader::toString(SkString* str) const {
static const char* gTileModeName[SkShader::kTileModeCount] = {
"clamp", "repeat", "mirror"
};
str->append("BitmapShader: (");
str->appendf("(%s, %s)",
gTileModeName[fState.fTileModeX],
gTileModeName[fState.fTileModeY]);
str->append(" ");
fRawBitmap.toString(str);
this->INHERITED::toString(str);
str->append(")");
}
#endif
///////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "GrTextureAccess.h"
#include "effects/GrSimpleTextureEffect.h"
#include "SkGr.h"
// Note that this will return -1 if either matrix is perspective.
static SkScalar get_combined_min_stretch(const SkMatrix& viewMatrix, const SkMatrix& localMatrix) {
if (localMatrix.isIdentity()) {
return viewMatrix.getMinStretch();
} else {
SkMatrix combined;
combined.setConcat(viewMatrix, localMatrix);
return combined.getMinStretch();
}
}
GrEffectRef* SkBitmapProcShader::asNewEffect(GrContext* context, const SkPaint& paint) const {
SkMatrix matrix;
matrix.setIDiv(fRawBitmap.width(), fRawBitmap.height());
SkMatrix lmInverse;
if (!this->getLocalMatrix().invert(&lmInverse)) {
return NULL;
}
matrix.preConcat(lmInverse);
SkShader::TileMode tm[] = {
(TileMode)fState.fTileModeX,
(TileMode)fState.fTileModeY,
};
// Must set wrap and filter on the sampler before requesting a texture. In two places below
// we check the matrix scale factors to determine how to interpret the filter quality setting.
// This completely ignores the complexity of the drawVertices case where explicit local coords
// are provided by the caller.
SkPaint::FilterLevel paintFilterLevel = paint.getFilterLevel();
GrTextureParams::FilterMode textureFilterMode;
switch(paintFilterLevel) {
case SkPaint::kNone_FilterLevel:
textureFilterMode = GrTextureParams::kNone_FilterMode;
break;
case SkPaint::kLow_FilterLevel:
textureFilterMode = GrTextureParams::kBilerp_FilterMode;
break;
case SkPaint::kMedium_FilterLevel:
if (get_combined_min_stretch(context->getMatrix(), this->getLocalMatrix()) <
SK_Scalar1) {
textureFilterMode = GrTextureParams::kMipMap_FilterMode;
} else {
// Don't trigger MIP level generation unnecessarily.
textureFilterMode = GrTextureParams::kBilerp_FilterMode;
}
break;
case SkPaint::kHigh_FilterLevel:
// Minification can look bad with bicubic filtering.
if (get_combined_min_stretch(context->getMatrix(), this->getLocalMatrix()) >=
SK_Scalar1) {
// fall back to no filtering here; we will install another shader that will do the
// HQ filtering.
textureFilterMode = GrTextureParams::kNone_FilterMode;
} else {
// Fall back to MIP-mapping.
paintFilterLevel = SkPaint::kMedium_FilterLevel;
textureFilterMode = GrTextureParams::kMipMap_FilterMode;
}
break;
default:
SkErrorInternals::SetError( kInvalidPaint_SkError,
"Sorry, I don't understand the filtering "
"mode you asked for. Falling back to "
"MIPMaps.");
textureFilterMode = GrTextureParams::kMipMap_FilterMode;
break;
}
GrTextureParams params(tm, textureFilterMode);
GrTexture* texture = GrLockAndRefCachedBitmapTexture(context, fRawBitmap, ¶ms);
if (NULL == texture) {
SkErrorInternals::SetError( kInternalError_SkError,
"Couldn't convert bitmap to texture.");
return NULL;
}
GrEffectRef* effect = NULL;
if (paintFilterLevel == SkPaint::kHigh_FilterLevel) {
effect = GrBicubicEffect::Create(texture, matrix, tm);
} else {
effect = GrSimpleTextureEffect::Create(texture, matrix, params);
}
GrUnlockAndUnrefCachedBitmapTexture(texture);
return effect;
}
#endif
|