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skia / skia / android/oreo / . / src / core / SkDraw.cpp
blob: 689e5b7c34b0a8c13a3a2b614d79c30102f7bea2 [file] [log] [blame]
/*
* 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.
*/
#define __STDC_LIMIT_MACROS
#include "SkDraw.h"
#include "SkArenaAlloc.h"
#include "SkBlendModePriv.h"
#include "SkBlitter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkColorShader.h"
#include "SkDevice.h"
#include "SkDeviceLooper.h"
#include "SkFindAndPlaceGlyph.h"
#include "SkFixed.h"
#include "SkLocalMatrixShader.h"
#include "SkMaskFilter.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPathEffect.h"
#include "SkRasterClip.h"
#include "SkRasterizer.h"
#include "SkRRect.h"
#include "SkScan.h"
#include "SkShader.h"
#include "SkString.h"
#include "SkStroke.h"
#include "SkStrokeRec.h"
#include "SkTemplates.h"
#include "SkTextMapStateProc.h"
#include "SkTLazy.h"
#include "SkUnPreMultiply.h"
#include "SkUtils.h"
#include "SkVertState.h"
#include "SkBitmapProcShader.h"
#include "SkDrawProcs.h"
#include "SkMatrixUtils.h"
//#define TRACE_BITMAP_DRAWS
// Helper function to fix code gen bug on ARM64.
// See SkFindAndPlaceGlyph.h for more details.
void FixGCC49Arm64Bug(int v) { }
/** Helper for allocating small blitters on the stack.
*/
class SkAutoBlitterChoose : SkNoncopyable {
public:
SkAutoBlitterChoose() {
fBlitter = nullptr;
}
SkAutoBlitterChoose(const SkPixmap& dst, const SkMatrix& matrix,
const SkPaint& paint, bool drawCoverage = false) {
fBlitter = SkBlitter::Choose(dst, matrix, paint, &fAlloc, drawCoverage);
}
SkBlitter* operator->() { return fBlitter; }
SkBlitter* get() const { return fBlitter; }
void choose(const SkPixmap& dst, const SkMatrix& matrix,
const SkPaint& paint, bool drawCoverage = false) {
SkASSERT(!fBlitter);
fBlitter = SkBlitter::Choose(dst, matrix, paint, &fAlloc, drawCoverage);
}
private:
// Owned by fAlloc, which will handle the delete.
SkBlitter* fBlitter;
char fStorage[kSkBlitterContextSize];
SkArenaAlloc fAlloc{fStorage};
};
#define SkAutoBlitterChoose(...) SK_REQUIRE_LOCAL_VAR(SkAutoBlitterChoose)
static SkPaint make_paint_with_image(
const SkPaint& origPaint, const SkBitmap& bitmap, SkMatrix* matrix = nullptr) {
SkPaint paint(origPaint);
paint.setShader(SkMakeBitmapShader(bitmap, SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode, matrix,
kNever_SkCopyPixelsMode));
return paint;
}
///////////////////////////////////////////////////////////////////////////////
SkDraw::SkDraw() {
sk_bzero(this, sizeof(*this));
}
bool SkDraw::computeConservativeLocalClipBounds(SkRect* localBounds) const {
if (fRC->isEmpty()) {
return false;
}
SkMatrix inverse;
if (!fMatrix->invert(&inverse)) {
return false;
}
SkIRect devBounds = fRC->getBounds();
// outset to have slop for antialasing and hairlines
devBounds.outset(1, 1);
inverse.mapRect(localBounds, SkRect::Make(devBounds));
return true;
}
///////////////////////////////////////////////////////////////////////////////
typedef void (*BitmapXferProc)(void* pixels, size_t bytes, uint32_t data);
static void D_Clear_BitmapXferProc(void* pixels, size_t bytes, uint32_t) {
sk_bzero(pixels, bytes);
}
static void D_Dst_BitmapXferProc(void*, size_t, uint32_t data) {}
static void D32_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
sk_memset32((uint32_t*)pixels, data, SkToInt(bytes >> 2));
}
static void D16_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
sk_memset16((uint16_t*)pixels, data, SkToInt(bytes >> 1));
}
static void DA8_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
memset(pixels, data, bytes);
}
static BitmapXferProc ChooseBitmapXferProc(const SkPixmap& dst, const SkPaint& paint,
uint32_t* data) {
// todo: we can apply colorfilter up front if no shader, so we wouldn't
// need to abort this fastpath
if (paint.getShader() || paint.getColorFilter()) {
return nullptr;
}
SkBlendMode mode = paint.getBlendMode();
SkColor color = paint.getColor();
// collaps modes based on color...
if (SkBlendMode::kSrcOver == mode) {
unsigned alpha = SkColorGetA(color);
if (0 == alpha) {
mode = SkBlendMode::kDst;
} else if (0xFF == alpha) {
mode = SkBlendMode::kSrc;
}
}
switch (mode) {
case SkBlendMode::kClear:
// SkDebugf("--- D_Clear_BitmapXferProc\n");
return D_Clear_BitmapXferProc; // ignore data
case SkBlendMode::kDst:
// SkDebugf("--- D_Dst_BitmapXferProc\n");
return D_Dst_BitmapXferProc; // ignore data
case SkBlendMode::kSrc: {
/*
should I worry about dithering for the lower depths?
*/
SkPMColor pmc = SkPreMultiplyColor(color);
switch (dst.colorType()) {
case kN32_SkColorType:
if (data) {
*data = pmc;
}
// SkDebugf("--- D32_Src_BitmapXferProc\n");
return D32_Src_BitmapXferProc;
case kRGB_565_SkColorType:
if (data) {
*data = SkPixel32ToPixel16(pmc);
}
// SkDebugf("--- D16_Src_BitmapXferProc\n");
return D16_Src_BitmapXferProc;
case kAlpha_8_SkColorType:
if (data) {
*data = SkGetPackedA32(pmc);
}
// SkDebugf("--- DA8_Src_BitmapXferProc\n");
return DA8_Src_BitmapXferProc;
default:
break;
}
break;
}
default:
break;
}
return nullptr;
}
static void CallBitmapXferProc(const SkPixmap& dst, const SkIRect& rect, BitmapXferProc proc,
uint32_t procData) {
int shiftPerPixel;
switch (dst.colorType()) {
case kN32_SkColorType:
shiftPerPixel = 2;
break;
case kRGB_565_SkColorType:
shiftPerPixel = 1;
break;
case kAlpha_8_SkColorType:
shiftPerPixel = 0;
break;
default:
SkDEBUGFAIL("Can't use xferproc on this config");
return;
}
uint8_t* pixels = (uint8_t*)dst.writable_addr();
SkASSERT(pixels);
const size_t rowBytes = dst.rowBytes();
const int widthBytes = rect.width() << shiftPerPixel;
// skip down to the first scanline and X position
pixels += rect.fTop * rowBytes + (rect.fLeft << shiftPerPixel);
for (int scans = rect.height() - 1; scans >= 0; --scans) {
proc(pixels, widthBytes, procData);
pixels += rowBytes;
}
}
void SkDraw::drawPaint(const SkPaint& paint) const {
SkDEBUGCODE(this->validate();)
if (fRC->isEmpty()) {
return;
}
SkIRect devRect;
devRect.set(0, 0, fDst.width(), fDst.height());
if (fRC->isBW()) {
/* If we don't have a shader (i.e. we're just a solid color) we may
be faster to operate directly on the device bitmap, rather than invoking
a blitter. Esp. true for xfermodes, which require a colorshader to be
present, which is just redundant work. Since we're drawing everywhere
in the clip, we don't have to worry about antialiasing.
*/
uint32_t procData = 0; // to avoid the warning
BitmapXferProc proc = ChooseBitmapXferProc(fDst, paint, &procData);
if (proc) {
if (D_Dst_BitmapXferProc == proc) { // nothing to do
return;
}
SkRegion::Iterator iter(fRC->bwRgn());
while (!iter.done()) {
CallBitmapXferProc(fDst, iter.rect(), proc, procData);
iter.next();
}
return;
}
}
// normal case: use a blitter
SkAutoBlitterChoose blitter(fDst, *fMatrix, paint);
SkScan::FillIRect(devRect, *fRC, blitter.get());
}
///////////////////////////////////////////////////////////////////////////////
struct PtProcRec {
SkCanvas::PointMode fMode;
const SkPaint* fPaint;
const SkRegion* fClip;
const SkRasterClip* fRC;
// computed values
SkFixed fRadius;
typedef void (*Proc)(const PtProcRec&, const SkPoint devPts[], int count,
SkBlitter*);
bool init(SkCanvas::PointMode, const SkPaint&, const SkMatrix* matrix,
const SkRasterClip*);
Proc chooseProc(SkBlitter** blitter);
private:
SkAAClipBlitterWrapper fWrapper;
};
static void bw_pt_rect_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
SkASSERT(rec.fClip->isRect());
const SkIRect& r = rec.fClip->getBounds();
for (int i = 0; i < count; i++) {
int x = SkScalarFloorToInt(devPts[i].fX);
int y = SkScalarFloorToInt(devPts[i].fY);
if (r.contains(x, y)) {
blitter->blitH(x, y, 1);
}
}
}
static void bw_pt_rect_16_hair_proc(const PtProcRec& rec,
const SkPoint devPts[], int count,
SkBlitter* blitter) {
SkASSERT(rec.fRC->isRect());
const SkIRect& r = rec.fRC->getBounds();
uint32_t value;
const SkPixmap* dst = blitter->justAnOpaqueColor(&value);
SkASSERT(dst);
uint16_t* addr = dst->writable_addr16(0, 0);
size_t rb = dst->rowBytes();
for (int i = 0; i < count; i++) {
int x = SkScalarFloorToInt(devPts[i].fX);
int y = SkScalarFloorToInt(devPts[i].fY);
if (r.contains(x, y)) {
((uint16_t*)((char*)addr + y * rb))[x] = SkToU16(value);
}
}
}
static void bw_pt_rect_32_hair_proc(const PtProcRec& rec,
const SkPoint devPts[], int count,
SkBlitter* blitter) {
SkASSERT(rec.fRC->isRect());
const SkIRect& r = rec.fRC->getBounds();
uint32_t value;
const SkPixmap* dst = blitter->justAnOpaqueColor(&value);
SkASSERT(dst);
SkPMColor* addr = dst->writable_addr32(0, 0);
size_t rb = dst->rowBytes();
for (int i = 0; i < count; i++) {
int x = SkScalarFloorToInt(devPts[i].fX);
int y = SkScalarFloorToInt(devPts[i].fY);
if (r.contains(x, y)) {
((SkPMColor*)((char*)addr + y * rb))[x] = value;
}
}
}
static void bw_pt_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
for (int i = 0; i < count; i++) {
int x = SkScalarFloorToInt(devPts[i].fX);
int y = SkScalarFloorToInt(devPts[i].fY);
if (rec.fClip->contains(x, y)) {
blitter->blitH(x, y, 1);
}
}
}
static void bw_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
for (int i = 0; i < count; i += 2) {
SkScan::HairLine(&devPts[i], 2, *rec.fRC, blitter);
}
}
static void bw_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
SkScan::HairLine(devPts, count, *rec.fRC, blitter);
}
// aa versions
static void aa_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
for (int i = 0; i < count; i += 2) {
SkScan::AntiHairLine(&devPts[i], 2, *rec.fRC, blitter);
}
}
static void aa_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
SkScan::AntiHairLine(devPts, count, *rec.fRC, blitter);
}
// square procs (strokeWidth > 0 but matrix is square-scale (sx == sy)
static void bw_square_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
const SkFixed radius = rec.fRadius;
for (int i = 0; i < count; i++) {
SkFixed x = SkScalarToFixed(devPts[i].fX);
SkFixed y = SkScalarToFixed(devPts[i].fY);
SkXRect r;
r.fLeft = x - radius;
r.fTop = y - radius;
r.fRight = x + radius;
r.fBottom = y + radius;
SkScan::FillXRect(r, *rec.fRC, blitter);
}
}
static void aa_square_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
const SkFixed radius = rec.fRadius;
for (int i = 0; i < count; i++) {
SkFixed x = SkScalarToFixed(devPts[i].fX);
SkFixed y = SkScalarToFixed(devPts[i].fY);
SkXRect r;
r.fLeft = x - radius;
r.fTop = y - radius;
r.fRight = x + radius;
r.fBottom = y + radius;
SkScan::AntiFillXRect(r, *rec.fRC, blitter);
}
}
// If this guy returns true, then chooseProc() must return a valid proc
bool PtProcRec::init(SkCanvas::PointMode mode, const SkPaint& paint,
const SkMatrix* matrix, const SkRasterClip* rc) {
if ((unsigned)mode > (unsigned)SkCanvas::kPolygon_PointMode) {
return false;
}
if (paint.getPathEffect()) {
return false;
}
SkScalar width = paint.getStrokeWidth();
if (0 == width) {
fMode = mode;
fPaint = &paint;
fClip = nullptr;
fRC = rc;
fRadius = SK_FixedHalf;
return true;
}
if (paint.getStrokeCap() != SkPaint::kRound_Cap &&
matrix->isScaleTranslate() && SkCanvas::kPoints_PointMode == mode) {
SkScalar sx = matrix->get(SkMatrix::kMScaleX);
SkScalar sy = matrix->get(SkMatrix::kMScaleY);
if (SkScalarNearlyZero(sx - sy)) {
if (sx < 0) {
sx = -sx;
}
fMode = mode;
fPaint = &paint;
fClip = nullptr;
fRC = rc;
fRadius = SkScalarToFixed(width * sx) >> 1;
return true;
}
}
return false;
}
PtProcRec::Proc PtProcRec::chooseProc(SkBlitter** blitterPtr) {
Proc proc = nullptr;
SkBlitter* blitter = *blitterPtr;
if (fRC->isBW()) {
fClip = &fRC->bwRgn();
} else {
fWrapper.init(*fRC, blitter);
fClip = &fWrapper.getRgn();
blitter = fWrapper.getBlitter();
*blitterPtr = blitter;
}
// for our arrays
SkASSERT(0 == SkCanvas::kPoints_PointMode);
SkASSERT(1 == SkCanvas::kLines_PointMode);
SkASSERT(2 == SkCanvas::kPolygon_PointMode);
SkASSERT((unsigned)fMode <= (unsigned)SkCanvas::kPolygon_PointMode);
if (fPaint->isAntiAlias()) {
if (0 == fPaint->getStrokeWidth()) {
static const Proc gAAProcs[] = {
aa_square_proc, aa_line_hair_proc, aa_poly_hair_proc
};
proc = gAAProcs[fMode];
} else if (fPaint->getStrokeCap() != SkPaint::kRound_Cap) {
SkASSERT(SkCanvas::kPoints_PointMode == fMode);
proc = aa_square_proc;
}
} else { // BW
if (fRadius <= SK_FixedHalf) { // small radii and hairline
if (SkCanvas::kPoints_PointMode == fMode && fClip->isRect()) {
uint32_t value;
const SkPixmap* bm = blitter->justAnOpaqueColor(&value);
if (bm && kRGB_565_SkColorType == bm->colorType()) {
proc = bw_pt_rect_16_hair_proc;
} else if (bm && kN32_SkColorType == bm->colorType()) {
proc = bw_pt_rect_32_hair_proc;
} else {
proc = bw_pt_rect_hair_proc;
}
} else {
static Proc gBWProcs[] = {
bw_pt_hair_proc, bw_line_hair_proc, bw_poly_hair_proc
};
proc = gBWProcs[fMode];
}
} else {
proc = bw_square_proc;
}
}
return proc;
}
// each of these costs 8-bytes of stack space, so don't make it too large
// must be even for lines/polygon to work
#define MAX_DEV_PTS 32
void SkDraw::drawPoints(SkCanvas::PointMode mode, size_t count,
const SkPoint pts[], const SkPaint& paint,
SkBaseDevice* device) const {
// if we're in lines mode, force count to be even
if (SkCanvas::kLines_PointMode == mode) {
count &= ~(size_t)1;
}
if ((long)count <= 0) {
return;
}
SkASSERT(pts != nullptr);
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty()) {
return;
}
PtProcRec rec;
if (!device && rec.init(mode, paint, fMatrix, fRC)) {
SkAutoBlitterChoose blitter(fDst, *fMatrix, paint);
SkPoint devPts[MAX_DEV_PTS];
const SkMatrix* matrix = fMatrix;
SkBlitter* bltr = blitter.get();
PtProcRec::Proc proc = rec.chooseProc(&bltr);
// we have to back up subsequent passes if we're in polygon mode
const size_t backup = (SkCanvas::kPolygon_PointMode == mode);
do {
int n = SkToInt(count);
if (n > MAX_DEV_PTS) {
n = MAX_DEV_PTS;
}
matrix->mapPoints(devPts, pts, n);
proc(rec, devPts, n, bltr);
pts += n - backup;
SkASSERT(SkToInt(count) >= n);
count -= n;
if (count > 0) {
count += backup;
}
} while (count != 0);
} else {
switch (mode) {
case SkCanvas::kPoints_PointMode: {
// temporarily mark the paint as filling.
SkPaint newPaint(paint);
newPaint.setStyle(SkPaint::kFill_Style);
SkScalar width = newPaint.getStrokeWidth();
SkScalar radius = SkScalarHalf(width);
if (newPaint.getStrokeCap() == SkPaint::kRound_Cap) {
SkPath path;
SkMatrix preMatrix;
path.addCircle(0, 0, radius);
for (size_t i = 0; i < count; i++) {
preMatrix.setTranslate(pts[i].fX, pts[i].fY);
// pass true for the last point, since we can modify
// then path then
path.setIsVolatile((count-1) == i);
if (device) {
device->drawPath(path, newPaint, &preMatrix, (count-1) == i);
} else {
this->drawPath(path, newPaint, &preMatrix, (count-1) == i);
}
}
} else {
SkRect r;
for (size_t i = 0; i < count; i++) {
r.fLeft = pts[i].fX - radius;
r.fTop = pts[i].fY - radius;
r.fRight = r.fLeft + width;
r.fBottom = r.fTop + width;
if (device) {
device->drawRect(r, newPaint);
} else {
this->drawRect(r, newPaint);
}
}
}
break;
}
case SkCanvas::kLines_PointMode:
if (2 == count && paint.getPathEffect()) {
// most likely a dashed line - see if it is one of the ones
// we can accelerate
SkStrokeRec rec(paint);
SkPathEffect::PointData pointData;
SkPath path;
path.moveTo(pts[0]);
path.lineTo(pts[1]);
SkRect cullRect = SkRect::Make(fRC->getBounds());
if (paint.getPathEffect()->asPoints(&pointData, path, rec,
*fMatrix, &cullRect)) {
// 'asPoints' managed to find some fast path
SkPaint newP(paint);
newP.setPathEffect(nullptr);
newP.setStyle(SkPaint::kFill_Style);
if (!pointData.fFirst.isEmpty()) {
if (device) {
device->drawPath(pointData.fFirst, newP);
} else {
this->drawPath(pointData.fFirst, newP);
}
}
if (!pointData.fLast.isEmpty()) {
if (device) {
device->drawPath(pointData.fLast, newP);
} else {
this->drawPath(pointData.fLast, newP);
}
}
if (pointData.fSize.fX == pointData.fSize.fY) {
// The rest of the dashed line can just be drawn as points
SkASSERT(pointData.fSize.fX == SkScalarHalf(newP.getStrokeWidth()));
if (SkPathEffect::PointData::kCircles_PointFlag & pointData.fFlags) {
newP.setStrokeCap(SkPaint::kRound_Cap);
} else {
newP.setStrokeCap(SkPaint::kButt_Cap);
}
if (device) {
device->drawPoints(SkCanvas::kPoints_PointMode,
pointData.fNumPoints,
pointData.fPoints,
newP);
} else {
this->drawPoints(SkCanvas::kPoints_PointMode,
pointData.fNumPoints,
pointData.fPoints,
newP,
device);
}
break;
} else {
// The rest of the dashed line must be drawn as rects
SkASSERT(!(SkPathEffect::PointData::kCircles_PointFlag &
pointData.fFlags));
SkRect r;
for (int i = 0; i < pointData.fNumPoints; ++i) {
r.set(pointData.fPoints[i].fX - pointData.fSize.fX,
pointData.fPoints[i].fY - pointData.fSize.fY,
pointData.fPoints[i].fX + pointData.fSize.fX,
pointData.fPoints[i].fY + pointData.fSize.fY);
if (device) {
device->drawRect(r, newP);
} else {
this->drawRect(r, newP);
}
}
}
break;
}
}
// couldn't take fast path so fall through!
case SkCanvas::kPolygon_PointMode: {
count -= 1;
SkPath path;
SkPaint p(paint);
p.setStyle(SkPaint::kStroke_Style);
size_t inc = (SkCanvas::kLines_PointMode == mode) ? 2 : 1;
path.setIsVolatile(true);
for (size_t i = 0; i < count; i += inc) {
path.moveTo(pts[i]);
path.lineTo(pts[i+1]);
if (device) {
device->drawPath(path, p, nullptr, true);
} else {
this->drawPath(path, p, nullptr, true);
}
path.rewind();
}
break;
}
}
}
}
static inline SkPoint compute_stroke_size(const SkPaint& paint, const SkMatrix& matrix) {
SkASSERT(matrix.rectStaysRect());
SkASSERT(SkPaint::kFill_Style != paint.getStyle());
SkVector size;
SkPoint pt = { paint.getStrokeWidth(), paint.getStrokeWidth() };
matrix.mapVectors(&size, &pt, 1);
return SkPoint::Make(SkScalarAbs(size.fX), SkScalarAbs(size.fY));
}
static bool easy_rect_join(const SkPaint& paint, const SkMatrix& matrix,
SkPoint* strokeSize) {
if (SkPaint::kMiter_Join != paint.getStrokeJoin() ||
paint.getStrokeMiter() < SK_ScalarSqrt2) {
return false;
}
*strokeSize = compute_stroke_size(paint, matrix);
return true;
}
SkDraw::RectType SkDraw::ComputeRectType(const SkPaint& paint,
const SkMatrix& matrix,
SkPoint* strokeSize) {
RectType rtype;
const SkScalar width = paint.getStrokeWidth();
const bool zeroWidth = (0 == width);
SkPaint::Style style = paint.getStyle();
if ((SkPaint::kStrokeAndFill_Style == style) && zeroWidth) {
style = SkPaint::kFill_Style;
}
if (paint.getPathEffect() || paint.getMaskFilter() ||
paint.getRasterizer() || !matrix.rectStaysRect() ||
SkPaint::kStrokeAndFill_Style == style) {
rtype = kPath_RectType;
} else if (SkPaint::kFill_Style == style) {
rtype = kFill_RectType;
} else if (zeroWidth) {
rtype = kHair_RectType;
} else if (easy_rect_join(paint, matrix, strokeSize)) {
rtype = kStroke_RectType;
} else {
rtype = kPath_RectType;
}
return rtype;
}
static const SkPoint* rect_points(const SkRect& r) {
return SkTCast<const SkPoint*>(&r);
}
static SkPoint* rect_points(SkRect& r) {
return SkTCast<SkPoint*>(&r);
}
void SkDraw::drawRect(const SkRect& prePaintRect, const SkPaint& paint,
const SkMatrix* paintMatrix, const SkRect* postPaintRect) const {
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty()) {
return;
}
const SkMatrix* matrix;
SkMatrix combinedMatrixStorage;
if (paintMatrix) {
SkASSERT(postPaintRect);
combinedMatrixStorage.setConcat(*fMatrix, *paintMatrix);
matrix = &combinedMatrixStorage;
} else {
SkASSERT(!postPaintRect);
matrix = fMatrix;
}
SkPoint strokeSize;
RectType rtype = ComputeRectType(paint, *fMatrix, &strokeSize);
if (kPath_RectType == rtype) {
SkDraw draw(*this);
if (paintMatrix) {
draw.fMatrix = matrix;
}
SkPath tmp;
tmp.addRect(prePaintRect);
tmp.setFillType(SkPath::kWinding_FillType);
draw.drawPath(tmp, paint, nullptr, true);
return;
}
SkRect devRect;
const SkRect& paintRect = paintMatrix ? *postPaintRect : prePaintRect;
// skip the paintMatrix when transforming the rect by the CTM
fMatrix->mapPoints(rect_points(devRect), rect_points(paintRect), 2);
devRect.sort();
// look for the quick exit, before we build a blitter
SkRect bbox = devRect;
if (paint.getStyle() != SkPaint::kFill_Style) {
// extra space for hairlines
if (paint.getStrokeWidth() == 0) {
bbox.outset(1, 1);
} else {
// For kStroke_RectType, strokeSize is already computed.
const SkPoint& ssize = (kStroke_RectType == rtype)
? strokeSize
: compute_stroke_size(paint, *fMatrix);
bbox.outset(SkScalarHalf(ssize.x()), SkScalarHalf(ssize.y()));
}
}
SkIRect ir = bbox.roundOut();
if (fRC->quickReject(ir)) {
return;
}
SkDeviceLooper looper(fDst, *fRC, ir, paint.isAntiAlias());
while (looper.next()) {
SkRect localDevRect;
looper.mapRect(&localDevRect, devRect);
SkMatrix localMatrix;
looper.mapMatrix(&localMatrix, *matrix);
SkAutoBlitterChoose blitterStorage(looper.getPixmap(), localMatrix, paint);
const SkRasterClip& clip = looper.getRC();
SkBlitter* blitter = blitterStorage.get();
// we want to "fill" if we are kFill or kStrokeAndFill, since in the latter
// case we are also hairline (if we've gotten to here), which devolves to
// effectively just kFill
switch (rtype) {
case kFill_RectType:
if (paint.isAntiAlias()) {
SkScan::AntiFillRect(localDevRect, clip, blitter);
} else {
SkScan::FillRect(localDevRect, clip, blitter);
}
break;
case kStroke_RectType:
if (paint.isAntiAlias()) {
SkScan::AntiFrameRect(localDevRect, strokeSize, clip, blitter);
} else {
SkScan::FrameRect(localDevRect, strokeSize, clip, blitter);
}
break;
case kHair_RectType:
if (paint.isAntiAlias()) {
SkScan::AntiHairRect(localDevRect, clip, blitter);
} else {
SkScan::HairRect(localDevRect, clip, blitter);
}
break;
default:
SkDEBUGFAIL("bad rtype");
}
}
}
void SkDraw::drawDevMask(const SkMask& srcM, const SkPaint& paint) const {
if (srcM.fBounds.isEmpty()) {
return;
}
const SkMask* mask = &srcM;
SkMask dstM;
if (paint.getMaskFilter() &&
paint.getMaskFilter()->filterMask(&dstM, srcM, *fMatrix, nullptr)) {
mask = &dstM;
}
SkAutoMaskFreeImage ami(dstM.fImage);
SkAutoBlitterChoose blitterChooser(fDst, *fMatrix, paint);
SkBlitter* blitter = blitterChooser.get();
SkAAClipBlitterWrapper wrapper;
const SkRegion* clipRgn;
if (fRC->isBW()) {
clipRgn = &fRC->bwRgn();
} else {
wrapper.init(*fRC, blitter);
clipRgn = &wrapper.getRgn();
blitter = wrapper.getBlitter();
}
blitter->blitMaskRegion(*mask, *clipRgn);
}
static SkScalar fast_len(const SkVector& vec) {
SkScalar x = SkScalarAbs(vec.fX);
SkScalar y = SkScalarAbs(vec.fY);
if (x < y) {
SkTSwap(x, y);
}
return x + SkScalarHalf(y);
}
bool SkDrawTreatAAStrokeAsHairline(SkScalar strokeWidth, const SkMatrix& matrix,
SkScalar* coverage) {
SkASSERT(strokeWidth > 0);
// We need to try to fake a thick-stroke with a modulated hairline.
if (matrix.hasPerspective()) {
return false;
}
SkVector src[2], dst[2];
src[0].set(strokeWidth, 0);
src[1].set(0, strokeWidth);
matrix.mapVectors(dst, src, 2);
SkScalar len0 = fast_len(dst[0]);
SkScalar len1 = fast_len(dst[1]);
if (len0 <= SK_Scalar1 && len1 <= SK_Scalar1) {
if (coverage) {
*coverage = SkScalarAve(len0, len1);
}
return true;
}
return false;
}
void SkDraw::drawRRect(const SkRRect& rrect, const SkPaint& paint) const {
SkDEBUGCODE(this->validate());
if (fRC->isEmpty()) {
return;
}
{
// TODO: Investigate optimizing these options. They are in the same
// order as SkDraw::drawPath, which handles each case. It may be
// that there is no way to optimize for these using the SkRRect path.
SkScalar coverage;
if (SkDrawTreatAsHairline(paint, *fMatrix, &coverage)) {
goto DRAW_PATH;
}
if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style) {
goto DRAW_PATH;
}
if (paint.getRasterizer()) {
goto DRAW_PATH;
}
}
if (paint.getMaskFilter()) {
// Transform the rrect into device space.
SkRRect devRRect;
if (rrect.transform(*fMatrix, &devRRect)) {
SkAutoBlitterChoose blitter(fDst, *fMatrix, paint);
if (paint.getMaskFilter()->filterRRect(devRRect, *fMatrix, *fRC, blitter.get())) {
return; // filterRRect() called the blitter, so we're done
}
}
}
DRAW_PATH:
// Now fall back to the default case of using a path.
SkPath path;
path.addRRect(rrect);
this->drawPath(path, paint, nullptr, true);
}
SkScalar SkDraw::ComputeResScaleForStroking(const SkMatrix& matrix) {
if (!matrix.hasPerspective()) {
SkScalar sx = SkPoint::Length(matrix[SkMatrix::kMScaleX], matrix[SkMatrix::kMSkewY]);
SkScalar sy = SkPoint::Length(matrix[SkMatrix::kMSkewX], matrix[SkMatrix::kMScaleY]);
if (SkScalarsAreFinite(sx, sy)) {
SkScalar scale = SkTMax(sx, sy);
if (scale > 0) {
return scale;
}
}
}
return 1;
}
void SkDraw::drawDevPath(const SkPath& devPath, const SkPaint& paint, bool drawCoverage,
SkBlitter* customBlitter, bool doFill) const {
// Do a conservative quick-reject test, since a looper or other modifier may have moved us
// out of range.
if (!devPath.isInverseFillType()) {
// If we're a H or V line, our bounds will be empty. So we bloat here just so we don't
// appear empty to the intersects call. This also gives us slop in case we're antialiasing
SkRect pathBounds = devPath.getBounds().makeOutset(1, 1);
if (paint.getMaskFilter()) {
paint.getMaskFilter()->computeFastBounds(pathBounds, &pathBounds);
// Need to outset the path to work-around a bug in blurmaskfilter. When that is fixed
// we can remove this hack. See skbug.com/5542
pathBounds.outset(7, 7);
}
// Now compare against the clip's bounds
if (!SkRect::Make(fRC->getBounds()).intersects(pathBounds)) {
return;
}
}
SkBlitter* blitter = nullptr;
SkAutoBlitterChoose blitterStorage;
if (nullptr == customBlitter) {
blitterStorage.choose(fDst, *fMatrix, paint, drawCoverage);
blitter = blitterStorage.get();
} else {
blitter = customBlitter;
}
if (paint.getMaskFilter()) {
SkStrokeRec::InitStyle style = doFill ? SkStrokeRec::kFill_InitStyle
: SkStrokeRec::kHairline_InitStyle;
if (paint.getMaskFilter()->filterPath(devPath, *fMatrix, *fRC, blitter, style)) {
return; // filterPath() called the blitter, so we're done
}
}
void (*proc)(const SkPath&, const SkRasterClip&, SkBlitter*);
if (doFill) {
if (paint.isAntiAlias()) {
proc = SkScan::AntiFillPath;
} else {
proc = SkScan::FillPath;
}
} else { // hairline
if (paint.isAntiAlias()) {
switch (paint.getStrokeCap()) {
case SkPaint::kButt_Cap:
proc = SkScan::AntiHairPath;
break;
case SkPaint::kSquare_Cap:
proc = SkScan::AntiHairSquarePath;
break;
case SkPaint::kRound_Cap:
proc = SkScan::AntiHairRoundPath;
break;
default:
proc SK_INIT_TO_AVOID_WARNING;
SkDEBUGFAIL("unknown paint cap type");
}
} else {
switch (paint.getStrokeCap()) {
case SkPaint::kButt_Cap:
proc = SkScan::HairPath;
break;
case SkPaint::kSquare_Cap:
proc = SkScan::HairSquarePath;
break;
case SkPaint::kRound_Cap:
proc = SkScan::HairRoundPath;
break;
default:
proc SK_INIT_TO_AVOID_WARNING;
SkDEBUGFAIL("unknown paint cap type");
}
}
}
proc(devPath, *fRC, blitter);
}
void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
const SkMatrix* prePathMatrix, bool pathIsMutable,
bool drawCoverage, SkBlitter* customBlitter) const {
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty()) {
return;
}
SkPath* pathPtr = (SkPath*)&origSrcPath;
bool doFill = true;
SkPath tmpPath;
SkMatrix tmpMatrix;
const SkMatrix* matrix = fMatrix;
tmpPath.setIsVolatile(true);
if (prePathMatrix) {
if (origPaint.getPathEffect() || origPaint.getStyle() != SkPaint::kFill_Style ||
origPaint.getRasterizer()) {
SkPath* result = pathPtr;
if (!pathIsMutable) {
result = &tmpPath;
pathIsMutable = true;
}
pathPtr->transform(*prePathMatrix, result);
pathPtr = result;
} else {
tmpMatrix.setConcat(*matrix, *prePathMatrix);
matrix = &tmpMatrix;
}
}
// at this point we're done with prePathMatrix
SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;)
SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
{
SkScalar coverage;
if (SkDrawTreatAsHairline(origPaint, *matrix, &coverage)) {
if (SK_Scalar1 == coverage) {
paint.writable()->setStrokeWidth(0);
} else if (SkBlendMode_SupportsCoverageAsAlpha(origPaint.getBlendMode())) {
U8CPU newAlpha;
#if 0
newAlpha = SkToU8(SkScalarRoundToInt(coverage *
origPaint.getAlpha()));
#else
// this is the old technique, which we preserve for now so
// we don't change previous results (testing)
// the new way seems fine, its just (a tiny bit) different
int scale = (int)(coverage * 256);
newAlpha = origPaint.getAlpha() * scale >> 8;
#endif
SkPaint* writablePaint = paint.writable();
writablePaint->setStrokeWidth(0);
writablePaint->setAlpha(newAlpha);
}
}
}
if (paint->getPathEffect() || paint->getStyle() != SkPaint::kFill_Style) {
SkRect cullRect;
const SkRect* cullRectPtr = nullptr;
if (this->computeConservativeLocalClipBounds(&cullRect)) {
cullRectPtr = &cullRect;
}
doFill = paint->getFillPath(*pathPtr, &tmpPath, cullRectPtr,
ComputeResScaleForStroking(*fMatrix));
pathPtr = &tmpPath;
}
if (paint->getRasterizer()) {
SkMask mask;
if (paint->getRasterizer()->rasterize(*pathPtr, *matrix,
&fRC->getBounds(), paint->getMaskFilter(), &mask,
SkMask::kComputeBoundsAndRenderImage_CreateMode)) {
this->drawDevMask(mask, *paint);
SkMask::FreeImage(mask.fImage);
}
return;
}
// avoid possibly allocating a new path in transform if we can
SkPath* devPathPtr = pathIsMutable ? pathPtr : &tmpPath;
// transform the path into device space
pathPtr->transform(*matrix, devPathPtr);
this->drawDevPath(*devPathPtr, *paint, drawCoverage, customBlitter, doFill);
}
void SkDraw::drawBitmapAsMask(const SkBitmap& bitmap, const SkPaint& paint) const {
SkASSERT(bitmap.colorType() == kAlpha_8_SkColorType);
if (SkTreatAsSprite(*fMatrix, bitmap.dimensions(), paint)) {
int ix = SkScalarRoundToInt(fMatrix->getTranslateX());
int iy = SkScalarRoundToInt(fMatrix->getTranslateY());
SkAutoPixmapUnlock result;
if (!bitmap.requestLock(&result)) {
return;
}
const SkPixmap& pmap = result.pixmap();
SkMask mask;
mask.fBounds.set(ix, iy, ix + pmap.width(), iy + pmap.height());
mask.fFormat = SkMask::kA8_Format;
mask.fRowBytes = SkToU32(pmap.rowBytes());
// fImage is typed as writable, but in this case it is used read-only
mask.fImage = (uint8_t*)pmap.addr8(0, 0);
this->drawDevMask(mask, paint);
} else { // need to xform the bitmap first
SkRect r;
SkMask mask;
r.set(0, 0,
SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
fMatrix->mapRect(&r);
r.round(&mask.fBounds);
// set the mask's bounds to the transformed bitmap-bounds,
// clipped to the actual device
{
SkIRect devBounds;
devBounds.set(0, 0, fDst.width(), fDst.height());
// need intersect(l, t, r, b) on irect
if (!mask.fBounds.intersect(devBounds)) {
return;
}
}
mask.fFormat = SkMask::kA8_Format;
mask.fRowBytes = SkAlign4(mask.fBounds.width());
size_t size = mask.computeImageSize();
if (0 == size) {
// the mask is too big to allocated, draw nothing
return;
}
// allocate (and clear) our temp buffer to hold the transformed bitmap
SkAutoTMalloc<uint8_t> storage(size);
mask.fImage = storage.get();
memset(mask.fImage, 0, size);
// now draw our bitmap(src) into mask(dst), transformed by the matrix
{
SkBitmap device;
device.installPixels(SkImageInfo::MakeA8(mask.fBounds.width(), mask.fBounds.height()),
mask.fImage, mask.fRowBytes);
SkCanvas c(device);
// need the unclipped top/left for the translate
c.translate(-SkIntToScalar(mask.fBounds.fLeft),
-SkIntToScalar(mask.fBounds.fTop));
c.concat(*fMatrix);
// We can't call drawBitmap, or we'll infinitely recurse. Instead
// we manually build a shader and draw that into our new mask
SkPaint tmpPaint;
tmpPaint.setFlags(paint.getFlags());
tmpPaint.setFilterQuality(paint.getFilterQuality());
SkPaint paintWithShader = make_paint_with_image(tmpPaint, bitmap);
SkRect rr;
rr.set(0, 0, SkIntToScalar(bitmap.width()),
SkIntToScalar(bitmap.height()));
c.drawRect(rr, paintWithShader);
}
this->drawDevMask(mask, paint);
}
}
static bool clipped_out(const SkMatrix& m, const SkRasterClip& c,
const SkRect& srcR) {
SkRect dstR;
m.mapRect(&dstR, srcR);
return c.quickReject(dstR.roundOut());
}
static bool clipped_out(const SkMatrix& matrix, const SkRasterClip& clip,
int width, int height) {
SkRect r;
r.set(0, 0, SkIntToScalar(width), SkIntToScalar(height));
return clipped_out(matrix, clip, r);
}
static bool clipHandlesSprite(const SkRasterClip& clip, int x, int y, const SkPixmap& pmap) {
return clip.isBW() || clip.quickContains(x, y, x + pmap.width(), y + pmap.height());
}
void SkDraw::drawBitmap(const SkBitmap& bitmap, const SkMatrix& prematrix,
const SkRect* dstBounds, const SkPaint& origPaint) const {
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty() ||
bitmap.width() == 0 || bitmap.height() == 0 ||
bitmap.colorType() == kUnknown_SkColorType) {
return;
}
SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
if (origPaint.getStyle() != SkPaint::kFill_Style) {
paint.writable()->setStyle(SkPaint::kFill_Style);
}
SkMatrix matrix;
matrix.setConcat(*fMatrix, prematrix);
if (clipped_out(matrix, *fRC, bitmap.width(), bitmap.height())) {
return;
}
if (bitmap.colorType() != kAlpha_8_SkColorType
&& SkTreatAsSprite(matrix, bitmap.dimensions(), *paint)) {
//
// It is safe to call lock pixels now, since we know the matrix is
// (more or less) identity.
//
SkAutoPixmapUnlock unlocker;
if (!bitmap.requestLock(&unlocker)) {
return;
}
const SkPixmap& pmap = unlocker.pixmap();
int ix = SkScalarRoundToInt(matrix.getTranslateX());
int iy = SkScalarRoundToInt(matrix.getTranslateY());
if (clipHandlesSprite(*fRC, ix, iy, pmap)) {
char storage[kSkBlitterContextSize];
SkArenaAlloc allocator{storage};
// blitter will be owned by the allocator.
SkBlitter* blitter = SkBlitter::ChooseSprite(fDst, *paint, pmap, ix, iy, &allocator);
if (blitter) {
SkScan::FillIRect(SkIRect::MakeXYWH(ix, iy, pmap.width(), pmap.height()),
*fRC, blitter);
return;
}
// if !blitter, then we fall-through to the slower case
}
}
// now make a temp draw on the stack, and use it
//
SkDraw draw(*this);
draw.fMatrix = &matrix;
if (bitmap.colorType() == kAlpha_8_SkColorType && !paint->getColorFilter()) {
draw.drawBitmapAsMask(bitmap, *paint);
} else {
SkPaint paintWithShader = make_paint_with_image(*paint, bitmap);
const SkRect srcBounds = SkRect::MakeIWH(bitmap.width(), bitmap.height());
if (dstBounds) {
this->drawRect(srcBounds, paintWithShader, &prematrix, dstBounds);
} else {
draw.drawRect(srcBounds, paintWithShader);
}
}
}
void SkDraw::drawSprite(const SkBitmap& bitmap, int x, int y, const SkPaint& origPaint) const {
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty() ||
bitmap.width() == 0 || bitmap.height() == 0 ||
bitmap.colorType() == kUnknown_SkColorType) {
return;
}
const SkIRect bounds = SkIRect::MakeXYWH(x, y, bitmap.width(), bitmap.height());
if (fRC->quickReject(bounds)) {
return; // nothing to draw
}
SkPaint paint(origPaint);
paint.setStyle(SkPaint::kFill_Style);
SkAutoPixmapUnlock unlocker;
if (!bitmap.requestLock(&unlocker)) {
return;
}
const SkPixmap& pmap = unlocker.pixmap();
if (nullptr == paint.getColorFilter() && clipHandlesSprite(*fRC, x, y, pmap)) {
// blitter will be owned by the allocator.
char storage[kSkBlitterContextSize];
SkArenaAlloc allocator{storage};
SkBlitter* blitter = SkBlitter::ChooseSprite(fDst, paint, pmap, x, y, &allocator);
if (blitter) {
SkScan::FillIRect(bounds, *fRC, blitter);
return;
}
}
SkMatrix matrix;
SkRect r;
// get a scalar version of our rect
r.set(bounds);
// create shader with offset
matrix.setTranslate(r.fLeft, r.fTop);
SkPaint paintWithShader = make_paint_with_image(paint, bitmap, &matrix);
SkDraw draw(*this);
matrix.reset();
draw.fMatrix = &matrix;
// call ourself with a rect
// is this OK if paint has a rasterizer?
draw.drawRect(r, paintWithShader);
}
///////////////////////////////////////////////////////////////////////////////
#include "SkScalerContext.h"
#include "SkGlyphCache.h"
#include "SkTextToPathIter.h"
#include "SkUtils.h"
bool SkDraw::ShouldDrawTextAsPaths(const SkPaint& paint, const SkMatrix& ctm) {
// hairline glyphs are fast enough so we don't need to cache them
if (SkPaint::kStroke_Style == paint.getStyle() && 0 == paint.getStrokeWidth()) {
return true;
}
// we don't cache perspective
if (ctm.hasPerspective()) {
return true;
}
SkMatrix textM;
return SkPaint::TooBigToUseCache(ctm, *paint.setTextMatrix(&textM));
}
void SkDraw::drawText_asPaths(const char text[], size_t byteLength, SkScalar x, SkScalar y,
const SkPaint& paint) const {
SkDEBUGCODE(this->validate();)
SkTextToPathIter iter(text, byteLength, paint, true);
SkMatrix matrix;
matrix.setScale(iter.getPathScale(), iter.getPathScale());
matrix.postTranslate(x, y);
const SkPath* iterPath;
SkScalar xpos, prevXPos = 0;
while (iter.next(&iterPath, &xpos)) {
matrix.postTranslate(xpos - prevXPos, 0);
if (iterPath) {
this->drawPath(*iterPath, iter.getPaint(), &matrix, false);
}
prevXPos = xpos;
}
}
// disable warning : local variable used without having been initialized
#if defined _WIN32
#pragma warning ( push )
#pragma warning ( disable : 4701 )
#endif
////////////////////////////////////////////////////////////////////////////////////////////////////
class DrawOneGlyph {
public:
DrawOneGlyph(const SkDraw& draw, const SkPaint& paint, SkGlyphCache* cache, SkBlitter* blitter)
: fUseRegionToDraw(UsingRegionToDraw(draw.fRC))
, fGlyphCache(cache)
, fBlitter(blitter)
, fClip(fUseRegionToDraw ? &draw.fRC->bwRgn() : nullptr)
, fDraw(draw)
, fPaint(paint)
, fClipBounds(PickClipBounds(draw)) { }
void operator()(const SkGlyph& glyph, SkPoint position, SkPoint rounding) {
position += rounding;
// Prevent glyphs from being drawn outside of or straddling the edge of device space.
// Comparisons written a little weirdly so that NaN coordinates are treated safely.
auto gt = [](float a, int b) { return !(a <= (float)b); };
auto lt = [](float a, int b) { return !(a >= (float)b); };
if (gt(position.fX, INT_MAX - (INT16_MAX + UINT16_MAX)) ||
lt(position.fX, INT_MIN - (INT16_MIN + 0 /*UINT16_MIN*/)) ||
gt(position.fY, INT_MAX - (INT16_MAX + UINT16_MAX)) ||
lt(position.fY, INT_MIN - (INT16_MIN + 0 /*UINT16_MIN*/))) {
return;
}
int left = SkScalarFloorToInt(position.fX);
int top = SkScalarFloorToInt(position.fY);
SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
left += glyph.fLeft;
top += glyph.fTop;
int right = left + glyph.fWidth;
int bottom = top + glyph.fHeight;
SkMask mask;
mask.fBounds.set(left, top, right, bottom);
SkASSERT(!mask.fBounds.isEmpty());
if (fUseRegionToDraw) {
SkRegion::Cliperator clipper(*fClip, mask.fBounds);
if (!clipper.done() && this->getImageData(glyph, &mask)) {
const SkIRect& cr = clipper.rect();
do {
this->blitMask(mask, cr);
clipper.next();
} while (!clipper.done());
}
} else {
SkIRect storage;
SkIRect* bounds = &mask.fBounds;
// this extra test is worth it, assuming that most of the time it succeeds
// since we can avoid writing to storage
if (!fClipBounds.containsNoEmptyCheck(mask.fBounds)) {
if (!storage.intersectNoEmptyCheck(mask.fBounds, fClipBounds))
return;
bounds = &storage;
}
if (this->getImageData(glyph, &mask)) {
this->blitMask(mask, *bounds);
}
}
}
private:
static bool UsingRegionToDraw(const SkRasterClip* rClip) {
return rClip->isBW() && !rClip->isRect();
}
static SkIRect PickClipBounds(const SkDraw& draw) {
const SkRasterClip& rasterClip = *draw.fRC;
if (rasterClip.isBW()) {
return rasterClip.bwRgn().getBounds();
} else {
return rasterClip.aaRgn().getBounds();
}
}
bool getImageData(const SkGlyph& glyph, SkMask* mask) {
uint8_t* bits = (uint8_t*)(fGlyphCache->findImage(glyph));
if (nullptr == bits) {
return false; // can't rasterize glyph
}
mask->fImage = bits;
mask->fRowBytes = glyph.rowBytes();
mask->fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
return true;
}
void blitMask(const SkMask& mask, const SkIRect& clip) const {
if (SkMask::kARGB32_Format == mask.fFormat) {
SkBitmap bm;
bm.installPixels(
SkImageInfo::MakeN32Premul(mask.fBounds.width(), mask.fBounds.height()),
(SkPMColor*)mask.fImage, mask.fRowBytes);
fDraw.drawSprite(bm, mask.fBounds.x(), mask.fBounds.y(), fPaint);
} else {
fBlitter->blitMask(mask, clip);
}
}
const bool fUseRegionToDraw;
SkGlyphCache * const fGlyphCache;
SkBlitter * const fBlitter;
const SkRegion* const fClip;
const SkDraw& fDraw;
const SkPaint& fPaint;
const SkIRect fClipBounds;
};
////////////////////////////////////////////////////////////////////////////////////////////////////
uint32_t SkDraw::scalerContextFlags() const {
uint32_t flags = SkPaint::kBoostContrast_ScalerContextFlag;
if (!fDst.colorSpace()) {
flags |= SkPaint::kFakeGamma_ScalerContextFlag;
}
return flags;
}
void SkDraw::drawText(const char text[], size_t byteLength, SkScalar x, SkScalar y,
const SkPaint& paint, const SkSurfaceProps* props) const {
SkASSERT(byteLength == 0 || text != nullptr);
SkDEBUGCODE(this->validate();)
// nothing to draw
if (text == nullptr || byteLength == 0 || fRC->isEmpty()) {
return;
}
// SkScalarRec doesn't currently have a way of representing hairline stroke and
// will fill if its frame-width is 0.
if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
this->drawText_asPaths(text, byteLength, x, y, paint);
return;
}
SkAutoGlyphCache cache(paint, props, this->scalerContextFlags(), fMatrix);
// The Blitter Choose needs to be live while using the blitter below.
SkAutoBlitterChoose blitterChooser(fDst, *fMatrix, paint);
SkAAClipBlitterWrapper wrapper(*fRC, blitterChooser.get());
DrawOneGlyph drawOneGlyph(*this, paint, cache.get(), wrapper.getBlitter());
SkFindAndPlaceGlyph::ProcessText(
paint.getTextEncoding(), text, byteLength,
{x, y}, *fMatrix, paint.getTextAlign(), cache.get(), drawOneGlyph);
}
//////////////////////////////////////////////////////////////////////////////
void SkDraw::drawPosText_asPaths(const char text[], size_t byteLength, const SkScalar pos[],
int scalarsPerPosition, const SkPoint& offset,
const SkPaint& origPaint, const SkSurfaceProps* props) const {
// setup our std paint, in hopes of getting hits in the cache
SkPaint paint(origPaint);
SkScalar matrixScale = paint.setupForAsPaths();
SkMatrix matrix;
matrix.setScale(matrixScale, matrixScale);
// Temporarily jam in kFill, so we only ever ask for the raw outline from the cache.
paint.setStyle(SkPaint::kFill_Style);
paint.setPathEffect(nullptr);
SkPaint::GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
paint.isDevKernText(),
true);
SkAutoGlyphCache cache(paint, props, this->scalerContextFlags(), nullptr);
const char* stop = text + byteLength;
SkTextAlignProc alignProc(paint.getTextAlign());
SkTextMapStateProc tmsProc(SkMatrix::I(), offset, scalarsPerPosition);
// Now restore the original settings, so we "draw" with whatever style/stroking.
paint.setStyle(origPaint.getStyle());
paint.setPathEffect(origPaint.refPathEffect());
while (text < stop) {
const SkGlyph& glyph = glyphCacheProc(cache.get(), &text);
if (glyph.fWidth) {
const SkPath* path = cache->findPath(glyph);
if (path) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkPoint loc;
alignProc(tmsLoc, glyph, &loc);
matrix[SkMatrix::kMTransX] = loc.fX;
matrix[SkMatrix::kMTransY] = loc.fY;
this->drawPath(*path, paint, &matrix, false);
}
}
pos += scalarsPerPosition;
}
}
void SkDraw::drawPosText(const char text[], size_t byteLength, const SkScalar pos[],
int scalarsPerPosition, const SkPoint& offset, const SkPaint& paint,
const SkSurfaceProps* props) const {
SkASSERT(byteLength == 0 || text != nullptr);
SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
SkDEBUGCODE(this->validate();)
// nothing to draw
if (text == nullptr || byteLength == 0 || fRC->isEmpty()) {
return;
}
if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
this->drawPosText_asPaths(text, byteLength, pos, scalarsPerPosition, offset, paint, props);
return;
}
SkAutoGlyphCache cache(paint, props, this->scalerContextFlags(), fMatrix);
// The Blitter Choose needs to be live while using the blitter below.
SkAutoBlitterChoose blitterChooser(fDst, *fMatrix, paint);
SkAAClipBlitterWrapper wrapper(*fRC, blitterChooser.get());
DrawOneGlyph drawOneGlyph(*this, paint, cache.get(), wrapper.getBlitter());
SkPaint::Align textAlignment = paint.getTextAlign();
SkFindAndPlaceGlyph::ProcessPosText(
paint.getTextEncoding(), text, byteLength,
offset, *fMatrix, pos, scalarsPerPosition, textAlignment, cache.get(), drawOneGlyph);
}
#if defined _WIN32
#pragma warning ( pop )
#endif
///////////////////////////////////////////////////////////////////////////////
static SkScan::HairRCProc ChooseHairProc(bool doAntiAlias) {
return doAntiAlias ? SkScan::AntiHairLine : SkScan::HairLine;
}
static bool texture_to_matrix(const VertState& state, const SkPoint verts[],
const SkPoint texs[], SkMatrix* matrix) {
SkPoint src[3], dst[3];
src[0] = texs[state.f0];
src[1] = texs[state.f1];
src[2] = texs[state.f2];
dst[0] = verts[state.f0];
dst[1] = verts[state.f1];
dst[2] = verts[state.f2];
return matrix->setPolyToPoly(src, dst, 3);
}
class SkTriColorShader : public SkShader {
public:
SkTriColorShader();
class TriColorShaderContext : public SkShader::Context {
public:
TriColorShaderContext(const SkTriColorShader& shader, const ContextRec&);
~TriColorShaderContext() override;
void shadeSpan(int x, int y, SkPMColor dstC[], int count) override;
private:
bool setup(const SkPoint pts[], const SkColor colors[], int, int, int);
SkMatrix fDstToUnit;
SkPMColor fColors[3];
bool fSetup;
typedef SkShader::Context INHERITED;
};
struct TriColorShaderData {
const SkPoint* pts;
const SkColor* colors;
const VertState *state;
};
SK_TO_STRING_OVERRIDE()
// For serialization. This will never be called.
Factory getFactory() const override { sk_throw(); return nullptr; }
// Supply setup data to context from drawing setup
void bindSetupData(TriColorShaderData* setupData) { fSetupData = setupData; }
// Take the setup data from context when needed.
TriColorShaderData* takeSetupData() {
TriColorShaderData *data = fSetupData;
fSetupData = NULL;
return data;
}
protected:
Context* onMakeContext(const ContextRec& rec, SkArenaAlloc* alloc) const override {
return alloc->make<TriColorShaderContext>(*this, rec);
}
private:
TriColorShaderData *fSetupData;
typedef SkShader INHERITED;
};
bool SkTriColorShader::TriColorShaderContext::setup(const SkPoint pts[], const SkColor colors[],
int index0, int index1, int index2) {
fColors[0] = SkPreMultiplyColor(colors[index0]);
fColors[1] = SkPreMultiplyColor(colors[index1]);
fColors[2] = SkPreMultiplyColor(colors[index2]);
SkMatrix m, im;
m.reset();
m.set(0, pts[index1].fX - pts[index0].fX);
m.set(1, pts[index2].fX - pts[index0].fX);
m.set(2, pts[index0].fX);
m.set(3, pts[index1].fY - pts[index0].fY);
m.set(4, pts[index2].fY - pts[index0].fY);
m.set(5, pts[index0].fY);
if (!m.invert(&im)) {
return false;
}
// We can't call getTotalInverse(), because we explicitly don't want to look at the localmatrix
// as our interators are intrinsically tied to the vertices, and nothing else.
SkMatrix ctmInv;
if (!this->getCTM().invert(&ctmInv)) {
return false;
}
// TODO replace INV(m) * INV(ctm) with INV(ctm * m)
fDstToUnit.setConcat(im, ctmInv);
return true;
}
#include "SkColorPriv.h"
#include "SkComposeShader.h"
static int ScalarTo256(SkScalar v) {
return static_cast<int>(SkScalarPin(v, 0, 1) * 256 + 0.5);
}
SkTriColorShader::SkTriColorShader()
: INHERITED(NULL)
, fSetupData(NULL) {}
SkTriColorShader::TriColorShaderContext::TriColorShaderContext(const SkTriColorShader& shader,
const ContextRec& rec)
: INHERITED(shader, rec)
, fSetup(false) {}
SkTriColorShader::TriColorShaderContext::~TriColorShaderContext() {}
void SkTriColorShader::TriColorShaderContext::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
SkTriColorShader* parent = static_cast<SkTriColorShader*>(const_cast<SkShader*>(&fShader));
TriColorShaderData* set = parent->takeSetupData();
if (set) {
fSetup = setup(set->pts, set->colors, set->state->f0, set->state->f1, set->state->f2);
}
if (!fSetup) {
// Invalid matrices. Not checked before so no need to assert.
return;
}
const int alphaScale = Sk255To256(this->getPaintAlpha());
SkPoint src;
for (int i = 0; i < count; i++) {
fDstToUnit.mapXY(SkIntToScalar(x), SkIntToScalar(y), &src);
x += 1;
int scale1 = ScalarTo256(src.fX);
int scale2 = ScalarTo256(src.fY);
int scale0 = 256 - scale1 - scale2;
if (scale0 < 0) {
if (scale1 > scale2) {
scale2 = 256 - scale1;
} else {
scale1 = 256 - scale2;
}
scale0 = 0;
}
if (256 != alphaScale) {
scale0 = SkAlphaMul(scale0, alphaScale);
scale1 = SkAlphaMul(scale1, alphaScale);
scale2 = SkAlphaMul(scale2, alphaScale);
}
dstC[i] = SkAlphaMulQ(fColors[0], scale0) +
SkAlphaMulQ(fColors[1], scale1) +
SkAlphaMulQ(fColors[2], scale2);
}
}
#ifndef SK_IGNORE_TO_STRING
void SkTriColorShader::toString(SkString* str) const {
str->append("SkTriColorShader: (");
this->INHERITED::toString(str);
str->append(")");
}
#endif
namespace {
// Similar to SkLocalMatrixShader, but composes the local matrix with the CTM (instead
// of composing with the inherited local matrix):
//
// rec' = {rec.ctm x localMatrix, rec.localMatrix}
//
// (as opposed to rec' = {rec.ctm, rec.localMatrix x localMatrix})
//
class SkLocalInnerMatrixShader final : public SkShader {
public:
SkLocalInnerMatrixShader(sk_sp<SkShader> proxy, const SkMatrix& localMatrix)
: INHERITED(&localMatrix)
, fProxyShader(std::move(proxy)) {}
Factory getFactory() const override {
SkASSERT(false);
return nullptr;
}
protected:
void flatten(SkWriteBuffer&) const override {
SkASSERT(false);
}
Context* onMakeContext(const ContextRec& rec, SkArenaAlloc* alloc) const override {
SkMatrix adjustedCTM = SkMatrix::Concat(*rec.fMatrix, this->getLocalMatrix());
ContextRec newRec(rec);
newRec.fMatrix = &adjustedCTM;
return fProxyShader->makeContext(newRec, alloc);
}
bool onAppendStages(SkRasterPipeline* p, SkColorSpace* cs, SkArenaAlloc* alloc,
const SkMatrix& ctm, const SkPaint& paint,
const SkMatrix* localM) const override {
// We control the shader graph ancestors, so we know there's no local matrix being
// injected before this.
SkASSERT(!localM);
SkMatrix adjustedCTM = SkMatrix::Concat(ctm, this->getLocalMatrix());
return fProxyShader->appendStages(p, cs, alloc, adjustedCTM, paint);
}
private:
sk_sp<SkShader> fProxyShader;
typedef SkShader INHERITED;
};
sk_sp<SkShader> MakeTextureShader(const VertState& state, const SkPoint verts[],
const SkPoint texs[], const SkPaint& paint,
SkColorSpace* dstColorSpace,
SkArenaAlloc* alloc) {
SkASSERT(paint.getShader());
const auto& p0 = texs[state.f0],
p1 = texs[state.f1],
p2 = texs[state.f2];
if (p0 != p1 || p0 != p2) {
// Common case (non-collapsed texture coordinates).
// Map the texture to vertices using a local transform.
// We cannot use a plain SkLocalMatrix shader, because we need the texture matrix
// to compose next to the CTM.
SkMatrix localMatrix;
return texture_to_matrix(state, verts, texs, &localMatrix)
? alloc->makeSkSp<SkLocalInnerMatrixShader>(paint.refShader(), localMatrix)
: nullptr;
}
// Collapsed texture coordinates special case.
// The texture is a solid color, sampled at the given point.
SkMatrix shaderInvLocalMatrix;
SkAssertResult(paint.getShader()->getLocalMatrix().invert(&shaderInvLocalMatrix));
const auto sample = SkPoint::Make(0.5f, 0.5f);
const auto mappedSample = shaderInvLocalMatrix.mapXY(sample.x(), sample.y()),
mappedPoint = shaderInvLocalMatrix.mapXY(p0.x(), p0.y());
const auto localMatrix = SkMatrix::MakeTrans(mappedSample.x() - mappedPoint.x(),
mappedSample.y() - mappedPoint.y());
SkShader::ContextRec rec(paint, SkMatrix::I(), &localMatrix,
SkShader::ContextRec::kPMColor_DstType, dstColorSpace);
auto* ctx = paint.getShader()->makeContext(rec, alloc);
if (!ctx) {
return nullptr;
}
SkPMColor pmColor;
ctx->shadeSpan(SkScalarFloorToInt(sample.x()), SkScalarFloorToInt(sample.y()), &pmColor, 1);
// no need to keep this temp context around.
alloc->reset();
return alloc->makeSkSp<SkColorShader>(SkUnPreMultiply::PMColorToColor(pmColor));
}
} // anonymous ns
void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
const SkPoint vertices[], const SkPoint textures[],
const SkColor colors[], SkBlendMode bmode,
const uint16_t indices[], int indexCount,
const SkPaint& paint) const {
SkASSERT(0 == count || vertices);
// abort early if there is nothing to draw
if (count < 3 || (indices && indexCount < 3) || fRC->isEmpty()) {
return;
}
// transform out vertices into device coordinates
SkAutoSTMalloc<16, SkPoint> storage(count);
SkPoint* devVerts = storage.get();
fMatrix->mapPoints(devVerts, vertices, count);
/*
We can draw the vertices in 1 of 4 ways:
- solid color (no shader/texture[], no colors[])
- just colors (no shader/texture[], has colors[])
- just texture (has shader/texture[], no colors[])
- colors * texture (has shader/texture[], has colors[])
Thus for texture drawing, we need both texture[] and a shader.
*/
auto triShader = sk_make_sp<SkTriColorShader>();
SkPaint p(paint);
SkShader* shader = p.getShader();
if (nullptr == shader) {
// if we have no shader, we ignore the texture coordinates
textures = nullptr;
} else if (nullptr == textures) {
// if we don't have texture coordinates, ignore the shader
p.setShader(nullptr);
shader = nullptr;
}
// setup the custom shader (if needed)
if (colors) {
if (nullptr == textures) {
// just colors (no texture)
p.setShader(triShader);
} else {
// colors * texture
SkASSERT(shader);
p.setShader(SkShader::MakeComposeShader(triShader, sk_ref_sp(shader), bmode));
}
}
SkAutoBlitterChoose blitter(fDst, *fMatrix, p);
// Abort early if we failed to create a shader context.
if (blitter->isNullBlitter()) {
return;
}
// setup our state and function pointer for iterating triangles
VertState state(count, indices, indexCount);
VertState::Proc vertProc = state.chooseProc(vmode);
if (textures || colors) {
SkTriColorShader::TriColorShaderData verticesSetup = { vertices, colors, &state };
while (vertProc(&state)) {
auto* blitterPtr = blitter.get();
// We're going to allocate at most
//
// * one SkLocalMatrixShader OR one SkColorShader
// * one SkComposeShader
// * one SkAutoBlitterChoose
//
static constexpr size_t kAllocSize =
sizeof(SkAutoBlitterChoose) + sizeof(SkComposeShader) +
SkTMax(sizeof(SkLocalInnerMatrixShader), sizeof(SkColorShader));
char allocBuffer[kAllocSize];
SkArenaAlloc alloc(allocBuffer);
if (textures) {
sk_sp<SkShader> texShader = MakeTextureShader(state, vertices, textures, paint,
fDst.colorSpace(), &alloc);
if (texShader) {
SkPaint localPaint(p);
localPaint.setShader(colors
? alloc.makeSkSp<SkComposeShader>(triShader, std::move(texShader), bmode)
: std::move(texShader));
blitterPtr = alloc.make<SkAutoBlitterChoose>(fDst, *fMatrix, localPaint)->get();
if (blitterPtr->isNullBlitter()) {
continue;
}
}
}
if (colors) {
triShader->bindSetupData(&verticesSetup);
}
SkPoint tmp[] = {
devVerts[state.f0], devVerts[state.f1], devVerts[state.f2]
};
SkScan::FillTriangle(tmp, *fRC, blitterPtr);
triShader->bindSetupData(nullptr);
}
} else {
// no colors[] and no texture, stroke hairlines with paint's color.
SkScan::HairRCProc hairProc = ChooseHairProc(paint.isAntiAlias());
const SkRasterClip& clip = *fRC;
while (vertProc(&state)) {
SkPoint array[] = {
devVerts[state.f0], devVerts[state.f1], devVerts[state.f2], devVerts[state.f0]
};
hairProc(array, 4, clip, blitter.get());
}
}
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_DEBUG
void SkDraw::validate() const {
SkASSERT(fMatrix != nullptr);
SkASSERT(fRC != nullptr);
const SkIRect& cr = fRC->getBounds();
SkIRect br;
br.set(0, 0, fDst.width(), fDst.height());
SkASSERT(cr.isEmpty() || br.contains(cr));
}
#endif
////////////////////////////////////////////////////////////////////////////////////////////////
#include "SkPath.h"
#include "SkDraw.h"
#include "SkRegion.h"
#include "SkBlitter.h"
static bool compute_bounds(const SkPath& devPath, const SkIRect* clipBounds,
const SkMaskFilter* filter, const SkMatrix* filterMatrix,
SkIRect* bounds) {
if (devPath.isEmpty()) {
return false;
}
// init our bounds from the path
*bounds = devPath.getBounds().makeOutset(SK_ScalarHalf, SK_ScalarHalf).roundOut();
SkIPoint margin = SkIPoint::Make(0, 0);
if (filter) {
SkASSERT(filterMatrix);
SkMask srcM, dstM;
srcM.fBounds = *bounds;
srcM.fFormat = SkMask::kA8_Format;
if (!filter->filterMask(&dstM, srcM, *filterMatrix, &margin)) {
return false;
}
}
// (possibly) trim the bounds to reflect the clip
// (plus whatever slop the filter needs)
if (clipBounds) {
// Ugh. Guard against gigantic margins from wacky filters. Without this
// check we can request arbitrary amounts of slop beyond our visible
// clip, and bring down the renderer (at least on finite RAM machines
// like handsets, etc.). Need to balance this invented value between
// quality of large filters like blurs, and the corresponding memory
// requests.
static const int MAX_MARGIN = 128;
if (!bounds->intersect(clipBounds->makeOutset(SkMin32(margin.fX, MAX_MARGIN),
SkMin32(margin.fY, MAX_MARGIN)))) {
return false;
}
}
return true;
}
static void draw_into_mask(const SkMask& mask, const SkPath& devPath,
SkStrokeRec::InitStyle style) {
SkDraw draw;
if (!draw.fDst.reset(mask)) {
return;
}
SkRasterClip clip;
SkMatrix matrix;
SkPaint paint;
clip.setRect(SkIRect::MakeWH(mask.fBounds.width(), mask.fBounds.height()));
matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft),
-SkIntToScalar(mask.fBounds.fTop));
draw.fRC = &clip;
draw.fMatrix = &matrix;
paint.setAntiAlias(true);
switch (style) {
case SkStrokeRec::kHairline_InitStyle:
SkASSERT(!paint.getStrokeWidth());
paint.setStyle(SkPaint::kStroke_Style);
break;
case SkStrokeRec::kFill_InitStyle:
SkASSERT(paint.getStyle() == SkPaint::kFill_Style);
break;
}
draw.drawPath(devPath, paint);
}
bool SkDraw::DrawToMask(const SkPath& devPath, const SkIRect* clipBounds,
const SkMaskFilter* filter, const SkMatrix* filterMatrix,
SkMask* mask, SkMask::CreateMode mode,
SkStrokeRec::InitStyle style) {
if (SkMask::kJustRenderImage_CreateMode != mode) {
if (!compute_bounds(devPath, clipBounds, filter, filterMatrix, &mask->fBounds))
return false;
}
if (SkMask::kComputeBoundsAndRenderImage_CreateMode == mode) {
mask->fFormat = SkMask::kA8_Format;
mask->fRowBytes = mask->fBounds.width();
size_t size = mask->computeImageSize();
if (0 == size) {
// we're too big to allocate the mask, abort
return false;
}
mask->fImage = SkMask::AllocImage(size);
memset(mask->fImage, 0, mask->computeImageSize());
}
if (SkMask::kJustComputeBounds_CreateMode != mode) {
draw_into_mask(*mask, devPath, style);
}
return true;
}