/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkArenaAlloc.h"
#include "SkBlitter.h"
#include "SkAntiRun.h"
#include "SkColor.h"
#include "SkColorFilter.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkMask.h"
#include "SkMaskFilterBase.h"
#include "SkPaintPriv.h"
#include "SkRegionPriv.h"
#include "SkShaderBase.h"
#include "SkString.h"
#include "SkTLazy.h"
#include "SkUtils.h"
#include "SkXfermodeInterpretation.h"
SkBlitter::~SkBlitter() {}
bool SkBlitter::isNullBlitter() const { return false; }
const SkPixmap* SkBlitter::justAnOpaqueColor(uint32_t* value) {
return nullptr;
}
/*
void SkBlitter::blitH(int x, int y, int width) {
SkDEBUGFAIL("unimplemented");
}
void SkBlitter::blitAntiH(int x, int y, const SkAlpha antialias[],
const int16_t runs[]) {
SkDEBUGFAIL("unimplemented");
}
*/
inline static SkAlpha ScalarToAlpha(SkScalar a) {
SkAlpha alpha = (SkAlpha)(a * 255);
return alpha > 247 ? 0xFF : alpha < 8 ? 0 : alpha;
}
void SkBlitter::blitFatAntiRect(const SkRect& rect) {
SkIRect bounds = rect.roundOut();
SkASSERT(bounds.width() >= 3 && bounds.height() >= 3);
int runSize = bounds.width() + 1; // +1 so we can set runs[bounds.width()] = 0
void* storage = this->allocBlitMemory(runSize * (sizeof(int16_t) + sizeof(SkAlpha)));
int16_t* runs = reinterpret_cast<int16_t*>(storage);
SkAlpha* alphas = reinterpret_cast<SkAlpha*>(runs + runSize);
runs[0] = 1;
runs[1] = bounds.width() - 2;
runs[bounds.width() - 1] = 1;
runs[bounds.width()] = 0;
SkScalar partialL = bounds.fLeft + 1 - rect.fLeft;
SkScalar partialR = rect.fRight - (bounds.fRight - 1);
SkScalar partialT = bounds.fTop + 1 - rect.fTop;
SkScalar partialB = rect.fBottom - (bounds.fBottom - 1);
alphas[0] = ScalarToAlpha(partialL * partialT);
alphas[1] = ScalarToAlpha(partialT);
alphas[bounds.width() - 1] = ScalarToAlpha(partialR * partialT);
this->blitAntiH(bounds.fLeft, bounds.fTop, alphas, runs);
this->blitAntiRect(bounds.fLeft, bounds.fTop + 1, bounds.width() - 2, bounds.height() - 2,
ScalarToAlpha(partialL), ScalarToAlpha(partialR));
alphas[0] = ScalarToAlpha(partialL * partialB);
alphas[1] = ScalarToAlpha(partialB);
alphas[bounds.width() - 1] = ScalarToAlpha(partialR * partialB);
this->blitAntiH(bounds.fLeft, bounds.fBottom - 1, alphas, runs);
}
void SkBlitter::blitCoverageDeltas(SkCoverageDeltaList* deltas, const SkIRect& clip,
bool isEvenOdd, bool isInverse, bool isConvex,
SkArenaAlloc* alloc) {
// We cannot use blitter to allocate the storage because the same blitter might be used across
// many threads.
int runSize = clip.width() + 1; // +1 so we can set runs[clip.width()] = 0
int16_t* runs = alloc->makeArrayDefault<int16_t>(runSize);
SkAlpha* alphas = alloc->makeArrayDefault<SkAlpha>(runSize);
runs[clip.width()] = 0; // we must set the last run to 0 so blitAntiH can stop there
bool canUseMask = !deltas->forceRLE() &&
SkCoverageDeltaMask::CanHandle(SkIRect::MakeLTRB(0, 0, clip.width(), 1));
const SkAntiRect& antiRect = deltas->getAntiRect();
// Only access rows within our clip. Otherwise, we'll have data race in the threaded backend.
int top = SkTMax(deltas->top(), clip.fTop);
int bottom = SkTMin(deltas->bottom(), clip.fBottom);
for(int y = top; y < bottom; ++y) {
// If antiRect is non-empty and we're at its top row, blit it and skip to the bottom
if (antiRect.fHeight && y == antiRect.fY) {
this->blitAntiRect(antiRect.fX, antiRect.fY, antiRect.fWidth, antiRect.fHeight,
antiRect.fLeftAlpha, antiRect.fRightAlpha);
y += antiRect.fHeight - 1; // -1 because ++y in the for loop
continue;
}
// If there are too many deltas, sorting will be slow. Using a mask is much faster.
// This is such an important optimization that will bring ~2x speedup for benches like
// path_fill_small_long_line and path_stroke_small_sawtooth.
if (canUseMask && !deltas->sorted(y) && deltas->count(y) << 3 >= clip.width()) {
SkIRect rowIR = SkIRect::MakeLTRB(clip.fLeft, y, clip.fRight, y + 1);
SkSTArenaAlloc<SkCoverageDeltaMask::MAX_SIZE> alloc;
SkCoverageDeltaMask mask(&alloc, rowIR);
for(int i = 0; i < deltas->count(y); ++i) {
const SkCoverageDelta& delta = deltas->getDelta(y, i);
mask.addDelta(delta.fX, y, delta.fDelta);
}
mask.convertCoverageToAlpha(isEvenOdd, isInverse, isConvex);
this->blitMask(mask.prepareSkMask(), rowIR);
continue;
}
// The normal flow of blitting deltas starts from here. First sort deltas.
deltas->sort(y);
int i = 0; // init delta index to 0
int lastX = clip.fLeft; // init x to clip.fLeft
SkFixed coverage = 0; // init coverage to 0
// skip deltas with x less than clip.fLeft; they must be precision errors
for(; i < deltas->count(y) && deltas->getDelta(y, i).fX < clip.fLeft; ++i);
for(; i < deltas->count(y) && deltas->getDelta(y, i).fX < clip.fRight; ++i) {
const SkCoverageDelta& delta = deltas->getDelta(y, i);
SkASSERT(delta.fX >= lastX); // delta must be x sorted
if (delta.fX > lastX) { // we have proceeded to a new x (different from lastX)
SkAlpha alpha = isConvex ? ConvexCoverageToAlpha(coverage, isInverse)
: CoverageToAlpha(coverage, isEvenOdd, isInverse);
alphas[lastX - clip.fLeft] = alpha; // set alpha at lastX
runs[lastX - clip.fLeft] = delta.fX - lastX; // set the run length
lastX = delta.fX; // now set lastX to current x
}
coverage += delta.fDelta; // cumulate coverage with the current delta
}
// Set the alpha and run length from the right-most delta to the right clip boundary
SkAlpha alpha = isConvex ? ConvexCoverageToAlpha(coverage, isInverse)
: CoverageToAlpha(coverage, isEvenOdd, isInverse);
alphas[lastX - clip.fLeft] = alpha;
runs[lastX - clip.fLeft] = clip.fRight - lastX;
this->blitAntiH(clip.fLeft, y, alphas, runs); // finally blit the current row
}
}
void SkBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
if (alpha == 255) {
this->blitRect(x, y, 1, height);
} else {
int16_t runs[2];
runs[0] = 1;
runs[1] = 0;
while (--height >= 0) {
this->blitAntiH(x, y++, &alpha, runs);
}
}
}
void SkBlitter::blitRect(int x, int y, int width, int height) {
SkASSERT(width > 0);
while (--height >= 0) {
this->blitH(x, y++, width);
}
}
/// Default implementation doesn't check for easy optimizations
/// such as alpha == 255; also uses blitV(), which some subclasses
/// may not support.
void SkBlitter::blitAntiRect(int x, int y, int width, int height,
SkAlpha leftAlpha, SkAlpha rightAlpha) {
if (leftAlpha > 0) { // we may send in x = -1 with leftAlpha = 0
this->blitV(x, y, height, leftAlpha);
}
x++;
if (width > 0) {
this->blitRect(x, y, width, height);
x += width;
}
if (rightAlpha > 0) {
this->blitV(x, y, height, rightAlpha);
}
}
//////////////////////////////////////////////////////////////////////////////
static inline void bits_to_runs(SkBlitter* blitter, int x, int y,
const uint8_t bits[],
uint8_t left_mask, ptrdiff_t rowBytes,
uint8_t right_mask) {
int inFill = 0;
int pos = 0;
while (--rowBytes >= 0) {
uint8_t b = *bits++ & left_mask;
if (rowBytes == 0) {
b &= right_mask;
}
for (uint8_t test = 0x80U; test != 0; test >>= 1) {
if (b & test) {
if (!inFill) {
pos = x;
inFill = true;
}
} else {
if (inFill) {
blitter->blitH(pos, y, x - pos);
inFill = false;
}
}
x += 1;
}
left_mask = 0xFFU;
}
// final cleanup
if (inFill) {
blitter->blitH(pos, y, x - pos);
}
}
// maskBitCount is the number of 1's to place in the mask. It must be in the range between 1 and 8.
static uint8_t generate_right_mask(int maskBitCount) {
return static_cast<uint8_t>(0xFF00U >> maskBitCount);
}
void SkBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
SkASSERT(mask.fBounds.contains(clip));
if (mask.fFormat == SkMask::kLCD16_Format) {
return; // needs to be handled by subclass
}
if (mask.fFormat == SkMask::kBW_Format) {
int cx = clip.fLeft;
int cy = clip.fTop;
int maskLeft = mask.fBounds.fLeft;
int maskRowBytes = mask.fRowBytes;
int height = clip.height();
const uint8_t* bits = mask.getAddr1(cx, cy);
SkDEBUGCODE(const uint8_t* endOfImage =
mask.fImage + (mask.fBounds.height() - 1) * maskRowBytes
+ ((mask.fBounds.width() + 7) >> 3));
if (cx == maskLeft && clip.fRight == mask.fBounds.fRight) {
while (--height >= 0) {
int affectedRightBit = mask.fBounds.width() - 1;
ptrdiff_t rowBytes = (affectedRightBit >> 3) + 1;
SkASSERT(bits + rowBytes <= endOfImage);
U8CPU rightMask = generate_right_mask((affectedRightBit & 7) + 1);
bits_to_runs(this, cx, cy, bits, 0xFF, rowBytes, rightMask);
bits += maskRowBytes;
cy += 1;
}
} else {
// Bits is calculated as the offset into the mask at the point {cx, cy} therefore, all
// addressing into the bit mask is relative to that point. Since this is an address
// calculated from a arbitrary bit in that byte, calculate the left most bit.
int bitsLeft = cx - ((cx - maskLeft) & 7);
// Everything is relative to the bitsLeft.
int leftEdge = cx - bitsLeft;
SkASSERT(leftEdge >= 0);
int rightEdge = clip.fRight - bitsLeft;
SkASSERT(rightEdge > leftEdge);
// Calculate left byte and mask
const uint8_t* leftByte = bits;
U8CPU leftMask = 0xFFU >> (leftEdge & 7);
// Calculate right byte and mask
int affectedRightBit = rightEdge - 1;
const uint8_t* rightByte = bits + (affectedRightBit >> 3);
U8CPU rightMask = generate_right_mask((affectedRightBit & 7) + 1);
// leftByte and rightByte are byte locations therefore, to get a count of bytes the
// code must add one.
ptrdiff_t rowBytes = rightByte - leftByte + 1;
while (--height >= 0) {
SkASSERT(bits + rowBytes <= endOfImage);
bits_to_runs(this, bitsLeft, cy, bits, leftMask, rowBytes, rightMask);
bits += maskRowBytes;
cy += 1;
}
}
} else {
int width = clip.width();
SkAutoSTMalloc<64, int16_t> runStorage(width + 1);
int16_t* runs = runStorage.get();
const uint8_t* aa = mask.getAddr8(clip.fLeft, clip.fTop);
sk_memset16((uint16_t*)runs, 1, width);
runs[width] = 0;
int height = clip.height();
int y = clip.fTop;
while (--height >= 0) {
this->blitAntiH(clip.fLeft, y, aa, runs);
aa += mask.fRowBytes;
y += 1;
}
}
}
/////////////////////// these guys are not virtual, just a helpers
void SkBlitter::blitMaskRegion(const SkMask& mask, const SkRegion& clip) {
if (clip.quickReject(mask.fBounds)) {
return;
}
SkRegion::Cliperator clipper(clip, mask.fBounds);
while (!clipper.done()) {
const SkIRect& cr = clipper.rect();
this->blitMask(mask, cr);
clipper.next();
}
}
void SkBlitter::blitRectRegion(const SkIRect& rect, const SkRegion& clip) {
SkRegion::Cliperator clipper(clip, rect);
while (!clipper.done()) {
const SkIRect& cr = clipper.rect();
this->blitRect(cr.fLeft, cr.fTop, cr.width(), cr.height());
clipper.next();
}
}
void SkBlitter::blitRegion(const SkRegion& clip) {
SkRegionPriv::VisitSpans(clip, [this](const SkIRect& r) {
this->blitRect(r.left(), r.top(), r.width(), r.height());
});
}
///////////////////////////////////////////////////////////////////////////////
void SkNullBlitter::blitH(int x, int y, int width) {}
void SkNullBlitter::blitAntiH(int x, int y, const SkAlpha antialias[],
const int16_t runs[]) {}
void SkNullBlitter::blitV(int x, int y, int height, SkAlpha alpha) {}
void SkNullBlitter::blitRect(int x, int y, int width, int height) {}
void SkNullBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {}
const SkPixmap* SkNullBlitter::justAnOpaqueColor(uint32_t* value) {
return nullptr;
}
bool SkNullBlitter::isNullBlitter() const { return true; }
///////////////////////////////////////////////////////////////////////////////
static int compute_anti_width(const int16_t runs[]) {
int width = 0;
for (;;) {
int count = runs[0];
SkASSERT(count >= 0);
if (count == 0) {
break;
}
width += count;
runs += count;
}
return width;
}
static inline bool y_in_rect(int y, const SkIRect& rect) {
return (unsigned)(y - rect.fTop) < (unsigned)rect.height();
}
static inline bool x_in_rect(int x, const SkIRect& rect) {
return (unsigned)(x - rect.fLeft) < (unsigned)rect.width();
}
void SkRectClipBlitter::blitH(int left, int y, int width) {
SkASSERT(width > 0);
if (!y_in_rect(y, fClipRect)) {
return;
}
int right = left + width;
if (left < fClipRect.fLeft) {
left = fClipRect.fLeft;
}
if (right > fClipRect.fRight) {
right = fClipRect.fRight;
}
width = right - left;
if (width > 0) {
fBlitter->blitH(left, y, width);
}
}
void SkRectClipBlitter::blitAntiH(int left, int y, const SkAlpha aa[],
const int16_t runs[]) {
if (!y_in_rect(y, fClipRect) || left >= fClipRect.fRight) {
return;
}
int x0 = left;
int x1 = left + compute_anti_width(runs);
if (x1 <= fClipRect.fLeft) {
return;
}
SkASSERT(x0 < x1);
if (x0 < fClipRect.fLeft) {
int dx = fClipRect.fLeft - x0;
SkAlphaRuns::BreakAt((int16_t*)runs, (uint8_t*)aa, dx);
runs += dx;
aa += dx;
x0 = fClipRect.fLeft;
}
SkASSERT(x0 < x1 && runs[x1 - x0] == 0);
if (x1 > fClipRect.fRight) {
x1 = fClipRect.fRight;
SkAlphaRuns::BreakAt((int16_t*)runs, (uint8_t*)aa, x1 - x0);
((int16_t*)runs)[x1 - x0] = 0;
}
SkASSERT(x0 < x1 && runs[x1 - x0] == 0);
SkASSERT(compute_anti_width(runs) == x1 - x0);
fBlitter->blitAntiH(x0, y, aa, runs);
}
void SkRectClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
SkASSERT(height > 0);
if (!x_in_rect(x, fClipRect)) {
return;
}
int y0 = y;
int y1 = y + height;
if (y0 < fClipRect.fTop) {
y0 = fClipRect.fTop;
}
if (y1 > fClipRect.fBottom) {
y1 = fClipRect.fBottom;
}
if (y0 < y1) {
fBlitter->blitV(x, y0, y1 - y0, alpha);
}
}
void SkRectClipBlitter::blitRect(int left, int y, int width, int height) {
SkIRect r;
r.set(left, y, left + width, y + height);
if (r.intersect(fClipRect)) {
fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
}
}
void SkRectClipBlitter::blitAntiRect(int left, int y, int width, int height,
SkAlpha leftAlpha, SkAlpha rightAlpha) {
SkIRect r;
// The *true* width of the rectangle blitted is width+2:
r.set(left, y, left + width + 2, y + height);
if (r.intersect(fClipRect)) {
if (r.fLeft != left) {
SkASSERT(r.fLeft > left);
leftAlpha = 255;
}
if (r.fRight != left + width + 2) {
SkASSERT(r.fRight < left + width + 2);
rightAlpha = 255;
}
if (255 == leftAlpha && 255 == rightAlpha) {
fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
} else if (1 == r.width()) {
if (r.fLeft == left) {
fBlitter->blitV(r.fLeft, r.fTop, r.height(), leftAlpha);
} else {
SkASSERT(r.fLeft == left + width + 1);
fBlitter->blitV(r.fLeft, r.fTop, r.height(), rightAlpha);
}
} else {
fBlitter->blitAntiRect(r.fLeft, r.fTop, r.width() - 2, r.height(),
leftAlpha, rightAlpha);
}
}
}
void SkRectClipBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
SkASSERT(mask.fBounds.contains(clip));
SkIRect r = clip;
if (r.intersect(fClipRect)) {
fBlitter->blitMask(mask, r);
}
}
const SkPixmap* SkRectClipBlitter::justAnOpaqueColor(uint32_t* value) {
return fBlitter->justAnOpaqueColor(value);
}
///////////////////////////////////////////////////////////////////////////////
void SkRgnClipBlitter::blitH(int x, int y, int width) {
SkRegion::Spanerator span(*fRgn, y, x, x + width);
int left, right;
while (span.next(&left, &right)) {
SkASSERT(left < right);
fBlitter->blitH(left, y, right - left);
}
}
void SkRgnClipBlitter::blitAntiH(int x, int y, const SkAlpha aa[],
const int16_t runs[]) {
int width = compute_anti_width(runs);
SkRegion::Spanerator span(*fRgn, y, x, x + width);
int left, right;
SkDEBUGCODE(const SkIRect& bounds = fRgn->getBounds();)
int prevRite = x;
while (span.next(&left, &right)) {
SkASSERT(x <= left);
SkASSERT(left < right);
SkASSERT(left >= bounds.fLeft && right <= bounds.fRight);
SkAlphaRuns::Break((int16_t*)runs, (uint8_t*)aa, left - x, right - left);
// now zero before left
if (left > prevRite) {
int index = prevRite - x;
((uint8_t*)aa)[index] = 0; // skip runs after right
((int16_t*)runs)[index] = SkToS16(left - prevRite);
}
prevRite = right;
}
if (prevRite > x) {
((int16_t*)runs)[prevRite - x] = 0;
if (x < 0) {
int skip = runs[0];
SkASSERT(skip >= -x);
aa += skip;
runs += skip;
x += skip;
}
fBlitter->blitAntiH(x, y, aa, runs);
}
}
void SkRgnClipBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
SkIRect bounds;
bounds.set(x, y, x + 1, y + height);
SkRegion::Cliperator iter(*fRgn, bounds);
while (!iter.done()) {
const SkIRect& r = iter.rect();
SkASSERT(bounds.contains(r));
fBlitter->blitV(x, r.fTop, r.height(), alpha);
iter.next();
}
}
void SkRgnClipBlitter::blitRect(int x, int y, int width, int height) {
SkIRect bounds;
bounds.set(x, y, x + width, y + height);
SkRegion::Cliperator iter(*fRgn, bounds);
while (!iter.done()) {
const SkIRect& r = iter.rect();
SkASSERT(bounds.contains(r));
fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
iter.next();
}
}
void SkRgnClipBlitter::blitAntiRect(int x, int y, int width, int height,
SkAlpha leftAlpha, SkAlpha rightAlpha) {
// The *true* width of the rectangle to blit is width + 2
SkIRect bounds;
bounds.set(x, y, x + width + 2, y + height);
SkRegion::Cliperator iter(*fRgn, bounds);
while (!iter.done()) {
const SkIRect& r = iter.rect();
SkASSERT(bounds.contains(r));
SkASSERT(r.fLeft >= x);
SkASSERT(r.fRight <= x + width + 2);
SkAlpha effectiveLeftAlpha = (r.fLeft == x) ? leftAlpha : 255;
SkAlpha effectiveRightAlpha = (r.fRight == x + width + 2) ?
rightAlpha : 255;
if (255 == effectiveLeftAlpha && 255 == effectiveRightAlpha) {
fBlitter->blitRect(r.fLeft, r.fTop, r.width(), r.height());
} else if (1 == r.width()) {
if (r.fLeft == x) {
fBlitter->blitV(r.fLeft, r.fTop, r.height(),
effectiveLeftAlpha);
} else {
SkASSERT(r.fLeft == x + width + 1);
fBlitter->blitV(r.fLeft, r.fTop, r.height(),
effectiveRightAlpha);
}
} else {
fBlitter->blitAntiRect(r.fLeft, r.fTop, r.width() - 2, r.height(),
effectiveLeftAlpha, effectiveRightAlpha);
}
iter.next();
}
}
void SkRgnClipBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
SkASSERT(mask.fBounds.contains(clip));
SkRegion::Cliperator iter(*fRgn, clip);
const SkIRect& r = iter.rect();
SkBlitter* blitter = fBlitter;
while (!iter.done()) {
blitter->blitMask(mask, r);
iter.next();
}
}
const SkPixmap* SkRgnClipBlitter::justAnOpaqueColor(uint32_t* value) {
return fBlitter->justAnOpaqueColor(value);
}
///////////////////////////////////////////////////////////////////////////////
SkBlitter* SkBlitterClipper::apply(SkBlitter* blitter, const SkRegion* clip,
const SkIRect* ir) {
if (clip) {
const SkIRect& clipR = clip->getBounds();
if (clip->isEmpty() || (ir && !SkIRect::Intersects(clipR, *ir))) {
blitter = &fNullBlitter;
} else if (clip->isRect()) {
if (ir == nullptr || !clipR.contains(*ir)) {
fRectBlitter.init(blitter, clipR);
blitter = &fRectBlitter;
}
} else {
fRgnBlitter.init(blitter, clip);
blitter = &fRgnBlitter;
}
}
return blitter;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkColorShader.h"
#include "SkColorData.h"
class Sk3DShader : public SkShaderBase {
public:
Sk3DShader(sk_sp<SkShader> proxy) : fProxy(std::move(proxy)) {}
Context* onMakeContext(const ContextRec& rec, SkArenaAlloc* alloc) const override {
SkShaderBase::Context* proxyContext = nullptr;
if (fProxy) {
proxyContext = as_SB(fProxy)->makeContext(rec, alloc);
if (!proxyContext) {
return nullptr;
}
}
return alloc->make<Sk3DShaderContext>(*this, rec, proxyContext);
}
class Sk3DShaderContext : public Context {
public:
// Calls proxyContext's destructor but will NOT free its memory.
Sk3DShaderContext(const Sk3DShader& shader, const ContextRec& rec,
Context* proxyContext)
: INHERITED(shader, rec)
, fMask(nullptr)
, fProxyContext(proxyContext)
{
if (!fProxyContext) {
fPMColor = SkPreMultiplyColor(rec.fPaint->getColor());
}
}
~Sk3DShaderContext() override = default;
void set3DMask(const SkMask* mask) override { fMask = mask; }
void shadeSpan(int x, int y, SkPMColor span[], int count) override {
if (fProxyContext) {
fProxyContext->shadeSpan(x, y, span, count);
}
if (fMask == nullptr) {
if (fProxyContext == nullptr) {
sk_memset32(span, fPMColor, count);
}
return;
}
SkASSERT(fMask->fBounds.contains(x, y));
SkASSERT(fMask->fBounds.contains(x + count - 1, y));
size_t size = fMask->computeImageSize();
const uint8_t* alpha = fMask->getAddr8(x, y);
const uint8_t* mulp = alpha + size;
const uint8_t* addp = mulp + size;
if (fProxyContext) {
for (int i = 0; i < count; i++) {
if (alpha[i]) {
SkPMColor c = span[i];
if (c) {
unsigned a = SkGetPackedA32(c);
unsigned r = SkGetPackedR32(c);
unsigned g = SkGetPackedG32(c);
unsigned b = SkGetPackedB32(c);
unsigned mul = SkAlpha255To256(mulp[i]);
unsigned add = addp[i];
r = SkFastMin32(SkAlphaMul(r, mul) + add, a);
g = SkFastMin32(SkAlphaMul(g, mul) + add, a);
b = SkFastMin32(SkAlphaMul(b, mul) + add, a);
span[i] = SkPackARGB32(a, r, g, b);
}
} else {
span[i] = 0;
}
}
} else { // color
unsigned a = SkGetPackedA32(fPMColor);
unsigned r = SkGetPackedR32(fPMColor);
unsigned g = SkGetPackedG32(fPMColor);
unsigned b = SkGetPackedB32(fPMColor);
for (int i = 0; i < count; i++) {
if (alpha[i]) {
unsigned mul = SkAlpha255To256(mulp[i]);
unsigned add = addp[i];
span[i] = SkPackARGB32( a,
SkFastMin32(SkAlphaMul(r, mul) + add, a),
SkFastMin32(SkAlphaMul(g, mul) + add, a),
SkFastMin32(SkAlphaMul(b, mul) + add, a));
} else {
span[i] = 0;
}
}
}
}
private:
// Unowned.
const SkMask* fMask;
// Memory is unowned.
Context* fProxyContext;
SkPMColor fPMColor;
typedef Context INHERITED;
};
#ifndef SK_IGNORE_TO_STRING
void toString(SkString* str) const override {
str->append("Sk3DShader: (");
if (fProxy) {
str->append("Proxy: ");
as_SB(fProxy)->toString(str);
}
this->INHERITED::toString(str);
str->append(")");
}
#endif
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(Sk3DShader)
protected:
void flatten(SkWriteBuffer& buffer) const override {
buffer.writeFlattenable(fProxy.get());
}
private:
sk_sp<SkShader> fProxy;
typedef SkShaderBase INHERITED;
};
sk_sp<SkFlattenable> Sk3DShader::CreateProc(SkReadBuffer& buffer) {
return sk_make_sp<Sk3DShader>(buffer.readShader());
}
class Sk3DBlitter : public SkBlitter {
public:
Sk3DBlitter(SkBlitter* proxy, SkShaderBase::Context* shaderContext)
: fProxy(proxy)
, fShaderContext(shaderContext)
{}
void blitH(int x, int y, int width) override {
fProxy->blitH(x, y, width);
}
void blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) override {
fProxy->blitAntiH(x, y, antialias, runs);
}
void blitV(int x, int y, int height, SkAlpha alpha) override {
fProxy->blitV(x, y, height, alpha);
}
void blitRect(int x, int y, int width, int height) override {
fProxy->blitRect(x, y, width, height);
}
void blitMask(const SkMask& mask, const SkIRect& clip) override {
if (mask.fFormat == SkMask::k3D_Format) {
fShaderContext->set3DMask(&mask);
((SkMask*)&mask)->fFormat = SkMask::kA8_Format;
fProxy->blitMask(mask, clip);
((SkMask*)&mask)->fFormat = SkMask::k3D_Format;
fShaderContext->set3DMask(nullptr);
} else {
fProxy->blitMask(mask, clip);
}
}
private:
// Both pointers are unowned. They will be deleted by SkSmallAllocator.
SkBlitter* fProxy;
SkShaderBase::Context* fShaderContext;
};
///////////////////////////////////////////////////////////////////////////////
#include "SkCoreBlitters.h"
SkShaderBase::ContextRec::DstType SkBlitter::PreferredShaderDest(const SkImageInfo& dstInfo) {
return (dstInfo.gammaCloseToSRGB() || dstInfo.colorType() == kRGBA_F16_SkColorType)
? SkShaderBase::ContextRec::kPM4f_DstType
: SkShaderBase::ContextRec::kPMColor_DstType;
}
// hack for testing, not to be exposed to clients
bool gSkForceRasterPipelineBlitter;
bool SkBlitter::UseRasterPipelineBlitter(const SkPixmap& device, const SkPaint& paint,
const SkMatrix& matrix) {
if (gSkForceRasterPipelineBlitter) {
return true;
}
if (device.info().alphaType() == kUnpremul_SkAlphaType) {
return true;
}
#if 0 || defined(SK_FORCE_RASTER_PIPELINE_BLITTER)
return true;
#else
// By policy we choose not to handle legacy 8888 with SkRasterPipelineBlitter.
if (device.colorSpace()) {
return true;
}
if (paint.getColorFilter()) {
return true;
}
if (paint.getFilterQuality() == kHigh_SkFilterQuality) {
return true;
}
// ... unless the blend mode is complicated enough.
if (paint.getBlendMode() > SkBlendMode::kLastSeparableMode) {
return true;
}
if (matrix.hasPerspective()) {
return true;
}
// ... or unless the shader is raster pipeline-only.
if (paint.getShader() && as_SB(paint.getShader())->isRasterPipelineOnly(matrix)) {
return true;
}
// Added support only for shaders (and other constraints) for android
if (device.colorType() == kRGB_565_SkColorType) {
return false;
}
return device.colorType() != kN32_SkColorType;
#endif
}
SkBlitter* SkBlitter::Choose(const SkPixmap& device,
const SkMatrix& matrix,
const SkPaint& origPaint,
SkArenaAlloc* alloc,
bool drawCoverage) {
SkASSERT(alloc != nullptr);
// which check, in case we're being called by a client with a dummy device
// (e.g. they have a bounder that always aborts the draw)
if (kUnknown_SkColorType == device.colorType() ||
(drawCoverage && (kAlpha_8_SkColorType != device.colorType()))) {
return alloc->make<SkNullBlitter>();
}
auto* shader = as_SB(origPaint.getShader());
SkColorFilter* cf = origPaint.getColorFilter();
SkBlendMode mode = origPaint.getBlendMode();
sk_sp<Sk3DShader> shader3D;
SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
if (origPaint.getMaskFilter() != nullptr &&
as_MFB(origPaint.getMaskFilter())->getFormat() == SkMask::k3D_Format) {
shader3D = sk_make_sp<Sk3DShader>(sk_ref_sp(shader));
// we know we haven't initialized lazyPaint yet, so just do it
paint.writable()->setShader(shader3D);
shader = as_SB(shader3D.get());
}
if (mode != SkBlendMode::kSrcOver) {
bool deviceIsOpaque = kRGB_565_SkColorType == device.colorType();
switch (SkInterpretXfermode(*paint, deviceIsOpaque)) {
case kSrcOver_SkXfermodeInterpretation:
mode = SkBlendMode::kSrcOver;
paint.writable()->setBlendMode(mode);
break;
case kSkipDrawing_SkXfermodeInterpretation:{
return alloc->make<SkNullBlitter>();
}
default:
break;
}
}
/*
* If the xfermode is CLEAR, then we can completely ignore the installed
* color/shader/colorfilter, and just pretend we're SRC + color==0. This
* will fall into our optimizations for SRC mode.
*/
if (mode == SkBlendMode::kClear) {
SkPaint* p = paint.writable();
p->setShader(nullptr);
shader = nullptr;
p->setColorFilter(nullptr);
cf = nullptr;
p->setBlendMode(mode = SkBlendMode::kSrc);
p->setColor(0);
}
if (kAlpha_8_SkColorType == device.colorType() && drawCoverage) {
SkASSERT(nullptr == shader);
SkASSERT(paint->isSrcOver());
return alloc->make<SkA8_Coverage_Blitter>(device, *paint);
}
if (paint->isDither() && !SkPaintPriv::ShouldDither(*paint, device.colorType())) {
// Disable dithering when not needed.
paint.writable()->setDither(false);
}
if (UseRasterPipelineBlitter(device, *paint, matrix)) {
auto blitter = SkCreateRasterPipelineBlitter(device, *paint, matrix, alloc);
SkASSERT(blitter);
return blitter;
}
if (nullptr == shader) {
if (mode != SkBlendMode::kSrcOver) {
// xfermodes (and filters) require shaders for our current blitters
paint.writable()->setShader(SkShader::MakeColorShader(paint->getColor()));
paint.writable()->setAlpha(0xFF);
shader = as_SB(paint->getShader());
} else if (cf) {
// if no shader && no xfermode, we just apply the colorfilter to
// our color and move on.
SkPaint* writablePaint = paint.writable();
writablePaint->setColor(cf->filterColor(paint->getColor()));
writablePaint->setColorFilter(nullptr);
cf = nullptr;
}
}
if (cf) {
SkASSERT(shader);
paint.writable()->setShader(shader->makeWithColorFilter(sk_ref_sp(cf)));
shader = as_SB(paint->getShader());
// blitters should ignore the presence/absence of a filter, since
// if there is one, the shader will take care of it.
}
/*
* We create a SkShader::Context object, and store it on the blitter.
*/
SkShaderBase::Context* shaderContext = nullptr;
if (shader) {
const SkShaderBase::ContextRec rec(*paint, matrix, nullptr,
PreferredShaderDest(device.info()),
device.colorSpace());
// Try to create the ShaderContext
shaderContext = shader->makeContext(rec, alloc);
if (!shaderContext) {
return alloc->make<SkNullBlitter>();
}
SkASSERT(shaderContext);
}
SkBlitter* blitter = nullptr;
switch (device.colorType()) {
case kN32_SkColorType:
// sRGB and general color spaces are handled via raster pipeline.
SkASSERT(!device.colorSpace());
if (shader) {
blitter = alloc->make<SkARGB32_Shader_Blitter>(device, *paint, shaderContext);
} else if (paint->getColor() == SK_ColorBLACK) {
blitter = alloc->make<SkARGB32_Black_Blitter>(device, *paint);
} else if (paint->getAlpha() == 0xFF) {
blitter = alloc->make<SkARGB32_Opaque_Blitter>(device, *paint);
} else {
blitter = alloc->make<SkARGB32_Blitter>(device, *paint);
}
break;
case kRGB_565_SkColorType:
if (shader && SkRGB565_Shader_Blitter::Supports(device, *paint)) {
blitter = alloc->make<SkRGB565_Shader_Blitter>(device, *paint, shaderContext);
} else {
blitter = SkCreateRasterPipelineBlitter(device, *paint, matrix, alloc);
}
break;
default:
// should have been handled via raster pipeline.
SkASSERT(false);
break;
}
if (!blitter) {
blitter = alloc->make<SkNullBlitter>();
}
if (shader3D) {
SkBlitter* innerBlitter = blitter;
// FIXME - comment about allocator
// innerBlitter was allocated by allocator, which will delete it.
// We know shaderContext or its proxies is of type Sk3DShaderContext, so we need to
// wrapper the blitter to notify it when we see an emboss mask.
blitter = alloc->make<Sk3DBlitter>(innerBlitter, shaderContext);
}
return blitter;
}
///////////////////////////////////////////////////////////////////////////////
SkShaderBlitter::SkShaderBlitter(const SkPixmap& device, const SkPaint& paint,
SkShaderBase::Context* shaderContext)
: INHERITED(device)
, fShader(paint.getShader())
, fShaderContext(shaderContext) {
SkASSERT(fShader);
SkASSERT(fShaderContext);
fShader->ref();
fShaderFlags = fShaderContext->getFlags();
fConstInY = SkToBool(fShaderFlags & SkShaderBase::kConstInY32_Flag);
}
SkShaderBlitter::~SkShaderBlitter() {
fShader->unref();
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#ifdef SK_DEBUG
void SkRectClipCheckBlitter::blitH(int x, int y, int width) {
SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, 1)));
fBlitter->blitH(x, y, width);
}
void SkRectClipCheckBlitter::blitAntiH(int x, int y, const SkAlpha aa[], const int16_t runs[]) {
const int16_t* iter = runs;
for (; *iter; iter += *iter)
;
int width = iter - runs;
SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, 1)));
fBlitter->blitAntiH(x, y, aa, runs);
}
void SkRectClipCheckBlitter::blitV(int x, int y, int height, SkAlpha alpha) {
SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 1, height)));
fBlitter->blitV(x, y, height, alpha);
}
void SkRectClipCheckBlitter::blitRect(int x, int y, int width, int height) {
SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, width, height)));
fBlitter->blitRect(x, y, width, height);
}
void SkRectClipCheckBlitter::blitAntiRect(int x, int y, int width, int height,
SkAlpha leftAlpha, SkAlpha rightAlpha) {
bool skipLeft = !leftAlpha;
bool skipRight = !rightAlpha;
SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x + skipLeft, y,
width + 2 - skipRight - skipLeft, height)));
fBlitter->blitAntiRect(x, y, width, height, leftAlpha, rightAlpha);
}
void SkRectClipCheckBlitter::blitMask(const SkMask& mask, const SkIRect& clip) {
SkASSERT(mask.fBounds.contains(clip));
SkASSERT(fClipRect.contains(clip));
fBlitter->blitMask(mask, clip);
}
const SkPixmap* SkRectClipCheckBlitter::justAnOpaqueColor(uint32_t* value) {
return fBlitter->justAnOpaqueColor(value);
}
void SkRectClipCheckBlitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) {
SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 2, 1)));
fBlitter->blitAntiH2(x, y, a0, a1);
}
void SkRectClipCheckBlitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) {
SkASSERT(fClipRect.contains(SkIRect::MakeXYWH(x, y, 1, 2)));
fBlitter->blitAntiV2(x, y, a0, a1);
}
#endif