/*
* 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 "SkDraw.h"
#include "SkBlitter.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkDevice.h"
#include "SkDeviceLooper.h"
#include "SkFixed.h"
#include "SkMaskFilter.h"
#include "SkPaint.h"
#include "SkPathEffect.h"
#include "SkRasterClip.h"
#include "SkRasterizer.h"
#include "SkRRect.h"
#include "SkScan.h"
#include "SkShader.h"
#include "SkSmallAllocator.h"
#include "SkString.h"
#include "SkStroke.h"
#include "SkTextMapStateProc.h"
#include "SkTLazy.h"
#include "SkUtils.h"
#include "SkVertState.h"
#include "SkAutoKern.h"
#include "SkBitmapProcShader.h"
#include "SkDrawProcs.h"
#include "SkMatrixUtils.h"
//#define TRACE_BITMAP_DRAWS
/** Helper for allocating small blitters on the stack.
*/
class SkAutoBlitterChoose : SkNoncopyable {
public:
SkAutoBlitterChoose() {
fBlitter = NULL;
}
SkAutoBlitterChoose(const SkBitmap& device, const SkMatrix& matrix,
const SkPaint& paint, bool drawCoverage = false) {
fBlitter = SkBlitter::Choose(device, matrix, paint, &fAllocator,
drawCoverage);
}
SkBlitter* operator->() { return fBlitter; }
SkBlitter* get() const { return fBlitter; }
void choose(const SkBitmap& device, const SkMatrix& matrix,
const SkPaint& paint) {
SkASSERT(!fBlitter);
fBlitter = SkBlitter::Choose(device, matrix, paint, &fAllocator);
}
private:
// Owned by fAllocator, which will handle the delete.
SkBlitter* fBlitter;
SkTBlitterAllocator fAllocator;
};
#define SkAutoBlitterChoose(...) SK_REQUIRE_LOCAL_VAR(SkAutoBlitterChoose)
/**
* Since we are providing the storage for the shader (to avoid the perf cost
* of calling new) we insist that in our destructor we can account for all
* owners of the shader.
*/
class SkAutoBitmapShaderInstall : SkNoncopyable {
public:
SkAutoBitmapShaderInstall(const SkBitmap& src, const SkPaint& paint,
const SkMatrix* localMatrix = NULL)
: fPaint(paint) /* makes a copy of the paint */ {
fPaint.setShader(CreateBitmapShader(src, SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode,
localMatrix, &fAllocator));
// we deliberately left the shader with an owner-count of 2
SkASSERT(2 == fPaint.getShader()->getRefCnt());
}
~SkAutoBitmapShaderInstall() {
// since fAllocator will destroy shader, we insist that owners == 2
SkASSERT(2 == fPaint.getShader()->getRefCnt());
fPaint.setShader(NULL); // unref the shader by 1
}
// return the new paint that has the shader applied
const SkPaint& paintWithShader() const { return fPaint; }
private:
// copy of caller's paint (which we then modify)
SkPaint fPaint;
// Stores the shader.
SkTBlitterAllocator fAllocator;
};
#define SkAutoBitmapShaderInstall(...) SK_REQUIRE_LOCAL_VAR(SkAutoBitmapShaderInstall)
///////////////////////////////////////////////////////////////////////////////
SkDraw::SkDraw() {
sk_bzero(this, sizeof(*this));
}
SkDraw::SkDraw(const SkDraw& src) {
memcpy(this, &src, 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 SkBitmap& bitmap,
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 NULL;
}
SkXfermode::Mode mode;
if (!SkXfermode::AsMode(paint.getXfermode(), &mode)) {
return NULL;
}
SkColor color = paint.getColor();
// collaps modes based on color...
if (SkXfermode::kSrcOver_Mode == mode) {
unsigned alpha = SkColorGetA(color);
if (0 == alpha) {
mode = SkXfermode::kDst_Mode;
} else if (0xFF == alpha) {
mode = SkXfermode::kSrc_Mode;
}
}
switch (mode) {
case SkXfermode::kClear_Mode:
// SkDebugf("--- D_Clear_BitmapXferProc\n");
return D_Clear_BitmapXferProc; // ignore data
case SkXfermode::kDst_Mode:
// SkDebugf("--- D_Dst_BitmapXferProc\n");
return D_Dst_BitmapXferProc; // ignore data
case SkXfermode::kSrc_Mode: {
/*
should I worry about dithering for the lower depths?
*/
SkPMColor pmc = SkPreMultiplyColor(color);
switch (bitmap.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 NULL;
}
static void CallBitmapXferProc(const SkBitmap& bitmap, const SkIRect& rect,
BitmapXferProc proc, uint32_t procData) {
int shiftPerPixel;
switch (bitmap.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*)bitmap.getPixels();
SkASSERT(pixels);
const size_t rowBytes = bitmap.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, fBitmap->width(), fBitmap->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(*fBitmap, paint, &procData);
if (proc) {
if (D_Dst_BitmapXferProc == proc) { // nothing to do
return;
}
SkRegion::Iterator iter(fRC->bwRgn());
while (!iter.done()) {
CallBitmapXferProc(*fBitmap, iter.rect(), proc, procData);
iter.next();
}
return;
}
}
// normal case: use a blitter
SkAutoBlitterChoose blitter(*fBitmap, *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 SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
SkASSERT(bitmap);
uint16_t* addr = bitmap->getAddr16(0, 0);
size_t rb = bitmap->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 SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
SkASSERT(bitmap);
SkPMColor* addr = bitmap->getAddr32(0, 0);
size_t rb = bitmap->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], devPts[i+1], *rec.fRC, blitter);
}
}
static void bw_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
for (int i = 0; i < count - 1; i++) {
SkScan::HairLine(devPts[i], devPts[i+1], *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], devPts[i+1], *rec.fRC, blitter);
}
}
static void aa_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
int count, SkBlitter* blitter) {
for (int i = 0; i < count - 1; i++) {
SkScan::AntiHairLine(devPts[i], devPts[i+1], *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 (paint.getPathEffect()) {
return false;
}
SkScalar width = paint.getStrokeWidth();
if (0 == width) {
fMode = mode;
fPaint = &paint;
fClip = NULL;
fRC = rc;
fRadius = SK_FixedHalf;
return true;
}
if (paint.getStrokeCap() != SkPaint::kRound_Cap &&
matrix->rectStaysRect() && 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 = NULL;
fRC = rc;
fRadius = SkScalarToFixed(SkScalarMul(width, sx)) >> 1;
return true;
}
}
return false;
}
PtProcRec::Proc PtProcRec::chooseProc(SkBlitter** blitterPtr) {
Proc proc = NULL;
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 SkBitmap* 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,
bool forceUseDevice) 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 != NULL);
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty()) {
return;
}
PtProcRec rec;
if (!forceUseDevice && rec.init(mode, paint, fMatrix, fRC)) {
SkAutoBlitterChoose blitter(*fBitmap, *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
if (fDevice) {
fDevice->drawPath(*this, 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 (fDevice) {
fDevice->drawRect(*this, r, newPaint);
} else {
this->drawRect(r, newPaint);
}
}
}
break;
}
case SkCanvas::kLines_PointMode:
#ifndef SK_DISABLE_DASHING_OPTIMIZATION
if (2 == count && NULL != 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(NULL);
newP.setStyle(SkPaint::kFill_Style);
if (!pointData.fFirst.isEmpty()) {
if (fDevice) {
fDevice->drawPath(*this, pointData.fFirst, newP);
} else {
this->drawPath(pointData.fFirst, newP);
}
}
if (!pointData.fLast.isEmpty()) {
if (fDevice) {
fDevice->drawPath(*this, 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 (fDevice) {
fDevice->drawPoints(*this,
SkCanvas::kPoints_PointMode,
pointData.fNumPoints,
pointData.fPoints,
newP);
} else {
this->drawPoints(SkCanvas::kPoints_PointMode,
pointData.fNumPoints,
pointData.fPoints,
newP,
forceUseDevice);
}
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 (fDevice) {
fDevice->drawRect(*this, r, newP);
} else {
this->drawRect(r, newP);
}
}
}
break;
}
}
#endif // DISABLE_DASHING_OPTIMIZATION
// 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;
for (size_t i = 0; i < count; i += inc) {
path.moveTo(pts[i]);
path.lineTo(pts[i+1]);
if (fDevice) {
fDevice->drawPath(*this, path, p, NULL, true);
} else {
this->drawPath(path, p, NULL, true);
}
path.rewind();
}
break;
}
}
}
}
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;
}
SkASSERT(matrix.rectStaysRect());
SkPoint pt = { paint.getStrokeWidth(), paint.getStrokeWidth() };
matrix.mapVectors(strokeSize, &pt, 1);
strokeSize->fX = SkScalarAbs(strokeSize->fX);
strokeSize->fY = SkScalarAbs(strokeSize->fY);
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& rect, const SkPaint& paint) const {
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty()) {
return;
}
SkPoint strokeSize;
RectType rtype = ComputeRectType(paint, *fMatrix, &strokeSize);
if (kPath_RectType == rtype) {
SkPath tmp;
tmp.addRect(rect);
tmp.setFillType(SkPath::kWinding_FillType);
this->drawPath(tmp, paint, NULL, true);
return;
}
const SkMatrix& matrix = *fMatrix;
SkRect devRect;
// transform rect into devRect
matrix.mapPoints(rect_points(devRect), rect_points(rect), 2);
devRect.sort();
// look for the quick exit, before we build a blitter
SkIRect ir;
devRect.roundOut(&ir);
if (paint.getStyle() != SkPaint::kFill_Style) {
// extra space for hairlines
ir.inset(-1, -1);
}
if (fRC->quickReject(ir)) {
return;
}
SkDeviceLooper looper(*fBitmap, *fRC, ir, paint.isAntiAlias());
while (looper.next()) {
SkRect localDevRect;
looper.mapRect(&localDevRect, devRect);
SkMatrix localMatrix;
looper.mapMatrix(&localMatrix, matrix);
SkAutoBlitterChoose blitterStorage(looper.getBitmap(), 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, NULL)) {
mask = &dstM;
} else {
dstM.fImage = NULL;
}
SkAutoMaskFreeImage ami(dstM.fImage);
SkAutoBlitterChoose blitterChooser(*fBitmap, *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);
}
static bool xfermodeSupportsCoverageAsAlpha(SkXfermode* xfer) {
SkXfermode::Coeff dc;
if (!SkXfermode::AsCoeff(xfer, NULL, &dc)) {
return false;
}
switch (dc) {
case SkXfermode::kOne_Coeff:
case SkXfermode::kISA_Coeff:
case SkXfermode::kISC_Coeff:
return true;
default:
return false;
}
}
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 (NULL != 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(*fBitmap, *fMatrix, paint);
if (paint.getMaskFilter()->filterRRect(devRRect, *fMatrix, *fRC, blitter.get(),
SkPaint::kFill_Style)) {
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, NULL, true);
}
void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
const SkMatrix* prePathMatrix, bool pathIsMutable,
bool drawCoverage) 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;
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 (xfermodeSupportsCoverageAsAlpha(origPaint.getXfermode())) {
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)SkScalarMul(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 = NULL;
if (this->computeConservativeLocalClipBounds(&cullRect)) {
cullRectPtr = &cullRect;
}
doFill = paint->getFillPath(*pathPtr, &tmpPath, cullRectPtr);
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);
SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, *paint, drawCoverage);
if (paint->getMaskFilter()) {
SkPaint::Style style = doFill ? SkPaint::kFill_Style :
SkPaint::kStroke_Style;
if (paint->getMaskFilter()->filterPath(*devPathPtr, *fMatrix, *fRC, blitter.get(), 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()) {
proc = SkScan::AntiHairPath;
} else {
proc = SkScan::HairPath;
}
}
proc(*devPathPtr, *fRC, blitter.get());
}
/** For the purposes of drawing bitmaps, if a matrix is "almost" translate
go ahead and treat it as if it were, so that subsequent code can go fast.
*/
static bool just_translate(const SkMatrix& matrix, const SkBitmap& bitmap) {
unsigned bits = 0; // TODO: find a way to allow the caller to tell us to
// respect filtering.
return SkTreatAsSprite(matrix, bitmap.width(), bitmap.height(), bits);
}
void SkDraw::drawBitmapAsMask(const SkBitmap& bitmap,
const SkPaint& paint) const {
SkASSERT(bitmap.colorType() == kAlpha_8_SkColorType);
if (just_translate(*fMatrix, bitmap)) {
int ix = SkScalarRoundToInt(fMatrix->getTranslateX());
int iy = SkScalarRoundToInt(fMatrix->getTranslateY());
SkAutoLockPixels alp(bitmap);
if (!bitmap.readyToDraw()) {
return;
}
SkMask mask;
mask.fBounds.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
mask.fFormat = SkMask::kA8_Format;
mask.fRowBytes = SkToU32(bitmap.rowBytes());
mask.fImage = bitmap.getAddr8(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, fBitmap->width(), fBitmap->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
SkAutoMalloc storage(size);
mask.fImage = (uint8_t*)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());
SkAutoBitmapShaderInstall install(bitmap, tmpPaint);
SkRect rr;
rr.set(0, 0, SkIntToScalar(bitmap.width()),
SkIntToScalar(bitmap.height()));
c.drawRect(rr, install.paintWithShader());
}
this->drawDevMask(mask, paint);
}
}
static bool clipped_out(const SkMatrix& m, const SkRasterClip& c,
const SkRect& srcR) {
SkRect dstR;
SkIRect devIR;
m.mapRect(&dstR, srcR);
dstR.roundOut(&devIR);
return c.quickReject(devIR);
}
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 SkBitmap& bitmap) {
return clip.isBW() ||
clip.quickContains(x, y, x + bitmap.width(), y + bitmap.height());
}
void SkDraw::drawBitmap(const SkBitmap& bitmap, const SkMatrix& prematrix,
const SkPaint& origPaint) const {
SkDEBUGCODE(this->validate();)
// nothing to draw
if (fRC->isEmpty() ||
bitmap.width() == 0 || bitmap.height() == 0 ||
bitmap.colorType() == kUnknown_SkColorType) {
return;
}
SkPaint paint(origPaint);
paint.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 && just_translate(matrix, bitmap)) {
//
// It is safe to call lock pixels now, since we know the matrix is
// (more or less) identity.
//
SkAutoLockPixels alp(bitmap);
if (!bitmap.readyToDraw()) {
return;
}
int ix = SkScalarRoundToInt(matrix.getTranslateX());
int iy = SkScalarRoundToInt(matrix.getTranslateY());
if (clipHandlesSprite(*fRC, ix, iy, bitmap)) {
SkTBlitterAllocator allocator;
// blitter will be owned by the allocator.
SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
ix, iy, &allocator);
if (blitter) {
SkIRect ir;
ir.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
SkScan::FillIRect(ir, *fRC, blitter);
return;
}
}
}
// now make a temp draw on the stack, and use it
//
SkDraw draw(*this);
draw.fMatrix = &matrix;
if (bitmap.colorType() == kAlpha_8_SkColorType) {
draw.drawBitmapAsMask(bitmap, paint);
} else {
SkAutoBitmapShaderInstall install(bitmap, paint);
SkRect r;
r.set(0, 0, SkIntToScalar(bitmap.width()),
SkIntToScalar(bitmap.height()));
// is this ok if paint has a rasterizer?
draw.drawRect(r, install.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;
}
SkIRect bounds;
bounds.set(x, y, x + bitmap.width(), y + bitmap.height());
if (fRC->quickReject(bounds)) {
return; // nothing to draw
}
SkPaint paint(origPaint);
paint.setStyle(SkPaint::kFill_Style);
if (NULL == paint.getColorFilter() && clipHandlesSprite(*fRC, x, y, bitmap)) {
SkTBlitterAllocator allocator;
// blitter will be owned by the allocator.
SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
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);
SkAutoBitmapShaderInstall install(bitmap, paint, &matrix);
const SkPaint& shaderPaint = install.paintWithShader();
SkDraw draw(*this);
matrix.reset();
draw.fMatrix = &matrix;
// call ourself with a rect
// is this OK if paint has a rasterizer?
draw.drawRect(r, shaderPaint);
}
///////////////////////////////////////////////////////////////////////////////
#include "SkScalerContext.h"
#include "SkGlyphCache.h"
#include "SkTextToPathIter.h"
#include "SkUtils.h"
static void measure_text(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
const char text[], size_t byteLength, SkVector* stopVector) {
SkFixed x = 0, y = 0;
const char* stop = text + byteLength;
SkAutoKern autokern;
while (text < stop) {
// don't need x, y here, since all subpixel variants will have the
// same advance
const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
x += autokern.adjust(glyph) + glyph.fAdvanceX;
y += glyph.fAdvanceY;
}
stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y));
SkASSERT(text == stop);
}
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) {
const SkPaint& pnt = iter.getPaint();
if (fDevice) {
fDevice->drawPath(*this, *iterPath, pnt, &matrix, false);
} else {
this->drawPath(*iterPath, pnt, &matrix, false);
}
}
prevXPos = xpos;
}
}
// disable warning : local variable used without having been initialized
#if defined _WIN32 && _MSC_VER >= 1300
#pragma warning ( push )
#pragma warning ( disable : 4701 )
#endif
//////////////////////////////////////////////////////////////////////////////
static void D1G_RectClip(const SkDraw1Glyph& state, SkFixed fx, SkFixed fy, const SkGlyph& glyph) {
int left = SkFixedFloorToInt(fx);
int top = SkFixedFloorToInt(fy);
SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
SkASSERT((NULL == state.fClip && state.fAAClip) ||
(state.fClip && NULL == state.fAAClip && state.fClip->isRect()));
left += glyph.fLeft;
top += glyph.fTop;
int right = left + glyph.fWidth;
int bottom = top + glyph.fHeight;
SkMask mask;
SkIRect storage;
SkIRect* bounds = &mask.fBounds;
mask.fBounds.set(left, top, right, bottom);
// this extra test is worth it, assuming that most of the time it succeeds
// since we can avoid writing to storage
if (!state.fClipBounds.containsNoEmptyCheck(left, top, right, bottom)) {
if (!storage.intersectNoEmptyCheck(mask.fBounds, state.fClipBounds))
return;
bounds = &storage;
}
uint8_t* aa = (uint8_t*)glyph.fImage;
if (NULL == aa) {
aa = (uint8_t*)state.fCache->findImage(glyph);
if (NULL == aa) {
return; // can't rasterize glyph
}
}
mask.fRowBytes = glyph.rowBytes();
mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
mask.fImage = aa;
state.blitMask(mask, *bounds);
}
static void D1G_RgnClip(const SkDraw1Glyph& state, SkFixed fx, SkFixed fy, const SkGlyph& glyph) {
int left = SkFixedFloorToInt(fx);
int top = SkFixedFloorToInt(fy);
SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
SkASSERT(!state.fClip->isRect());
SkMask mask;
left += glyph.fLeft;
top += glyph.fTop;
mask.fBounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight);
SkRegion::Cliperator clipper(*state.fClip, mask.fBounds);
if (!clipper.done()) {
const SkIRect& cr = clipper.rect();
const uint8_t* aa = (const uint8_t*)glyph.fImage;
if (NULL == aa) {
aa = (uint8_t*)state.fCache->findImage(glyph);
if (NULL == aa) {
return;
}
}
mask.fRowBytes = glyph.rowBytes();
mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
mask.fImage = (uint8_t*)aa;
do {
state.blitMask(mask, cr);
clipper.next();
} while (!clipper.done());
}
}
static bool hasCustomD1GProc(const SkDraw& draw) {
return draw.fProcs && draw.fProcs->fD1GProc;
}
static bool needsRasterTextBlit(const SkDraw& draw) {
return !hasCustomD1GProc(draw);
}
SkDraw1Glyph::Proc SkDraw1Glyph::init(const SkDraw* draw, SkBlitter* blitter, SkGlyphCache* cache,
const SkPaint& pnt) {
fDraw = draw;
fBlitter = blitter;
fCache = cache;
fPaint = &pnt;
if (cache->isSubpixel()) {
fHalfSampleX = fHalfSampleY = (SK_FixedHalf >> SkGlyph::kSubBits);
} else {
fHalfSampleX = fHalfSampleY = SK_FixedHalf;
}
if (hasCustomD1GProc(*draw)) {
// todo: fix this assumption about clips w/ custom
fClip = draw->fClip;
fClipBounds = fClip->getBounds();
return draw->fProcs->fD1GProc;
}
if (draw->fRC->isBW()) {
fAAClip = NULL;
fClip = &draw->fRC->bwRgn();
fClipBounds = fClip->getBounds();
if (fClip->isRect()) {
return D1G_RectClip;
} else {
return D1G_RgnClip;
}
} else { // aaclip
fAAClip = &draw->fRC->aaRgn();
fClip = NULL;
fClipBounds = fAAClip->getBounds();
return D1G_RectClip;
}
}
void SkDraw1Glyph::blitMaskAsSprite(const SkMask& mask) const {
SkASSERT(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);
}
///////////////////////////////////////////////////////////////////////////////
void SkDraw::drawText(const char text[], size_t byteLength,
SkScalar x, SkScalar y, const SkPaint& paint) const {
SkASSERT(byteLength == 0 || text != NULL);
SkDEBUGCODE(this->validate();)
// nothing to draw
if (text == NULL || 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;
}
SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();
SkAutoGlyphCache autoCache(paint, &fDevice->fLeakyProperties, fMatrix);
SkGlyphCache* cache = autoCache.getCache();
// transform our starting point
{
SkPoint loc;
fMatrix->mapXY(x, y, &loc);
x = loc.fX;
y = loc.fY;
}
// need to measure first
if (paint.getTextAlign() != SkPaint::kLeft_Align) {
SkVector stop;
measure_text(cache, glyphCacheProc, text, byteLength, &stop);
SkScalar stopX = stop.fX;
SkScalar stopY = stop.fY;
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
stopX = SkScalarHalf(stopX);
stopY = SkScalarHalf(stopY);
}
x -= stopX;
y -= stopY;
}
const char* stop = text + byteLength;
SkAAClipBlitter aaBlitter;
SkAutoBlitterChoose blitterChooser;
SkBlitter* blitter = NULL;
if (needsRasterTextBlit(*this)) {
blitterChooser.choose(*fBitmap, *fMatrix, paint);
blitter = blitterChooser.get();
if (fRC->isAA()) {
aaBlitter.init(blitter, &fRC->aaRgn());
blitter = &aaBlitter;
}
}
SkAutoKern autokern;
SkDraw1Glyph d1g;
SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache, paint);
SkFixed fxMask = ~0;
SkFixed fyMask = ~0;
if (cache->isSubpixel()) {
SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*fMatrix);
if (kX_SkAxisAlignment == baseline) {
fyMask = 0;
d1g.fHalfSampleY = SK_FixedHalf;
} else if (kY_SkAxisAlignment == baseline) {
fxMask = 0;
d1g.fHalfSampleX = SK_FixedHalf;
}
}
SkFixed fx = SkScalarToFixed(x) + d1g.fHalfSampleX;
SkFixed fy = SkScalarToFixed(y) + d1g.fHalfSampleY;
while (text < stop) {
const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);
fx += autokern.adjust(glyph);
if (glyph.fWidth) {
proc(d1g, fx, fy, glyph);
}
fx += glyph.fAdvanceX;
fy += glyph.fAdvanceY;
}
}
//////////////////////////////////////////////////////////////////////////////
void SkDraw::drawPosText_asPaths(const char text[], size_t byteLength,
const SkScalar pos[], SkScalar constY,
int scalarsPerPosition,
const SkPaint& origPaint) 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(NULL);
SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();
SkAutoGlyphCache autoCache(paint, NULL, NULL);
SkGlyphCache* cache = autoCache.getCache();
const char* stop = text + byteLength;
SkTextAlignProcScalar alignProc(paint.getTextAlign());
SkTextMapStateProc tmsProc(SkMatrix::I(), constY, scalarsPerPosition);
// Now restore the original settings, so we "draw" with whatever style/stroking.
paint.setStyle(origPaint.getStyle());
paint.setPathEffect(origPaint.getPathEffect());
while (text < stop) {
const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
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;
if (fDevice) {
fDevice->drawPath(*this, *path, paint, &matrix, false);
} else {
this->drawPath(*path, paint, &matrix, false);
}
}
}
pos += scalarsPerPosition;
}
}
void SkDraw::drawPosText(const char text[], size_t byteLength,
const SkScalar pos[], SkScalar constY,
int scalarsPerPosition, const SkPaint& paint) const {
SkASSERT(byteLength == 0 || text != NULL);
SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
SkDEBUGCODE(this->validate();)
// nothing to draw
if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
return;
}
if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
this->drawPosText_asPaths(text, byteLength, pos, constY,
scalarsPerPosition, paint);
return;
}
SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();
SkAutoGlyphCache autoCache(paint, &fDevice->fLeakyProperties, fMatrix);
SkGlyphCache* cache = autoCache.getCache();
SkAAClipBlitterWrapper wrapper;
SkAutoBlitterChoose blitterChooser;
SkBlitter* blitter = NULL;
if (needsRasterTextBlit(*this)) {
blitterChooser.choose(*fBitmap, *fMatrix, paint);
blitter = blitterChooser.get();
if (fRC->isAA()) {
wrapper.init(*fRC, blitter);
blitter = wrapper.getBlitter();
}
}
const char* stop = text + byteLength;
SkTextAlignProc alignProc(paint.getTextAlign());
SkDraw1Glyph d1g;
SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache, paint);
SkTextMapStateProc tmsProc(*fMatrix, constY, scalarsPerPosition);
if (cache->isSubpixel()) {
// maybe we should skip the rounding if linearText is set
SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*fMatrix);
SkFixed fxMask = ~0;
SkFixed fyMask = ~0;
if (kX_SkAxisAlignment == baseline) {
fyMask = 0;
#ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
d1g.fHalfSampleY = SK_FixedHalf;
#endif
} else if (kY_SkAxisAlignment == baseline) {
fxMask = 0;
#ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
d1g.fHalfSampleX = SK_FixedHalf;
#endif
}
if (SkPaint::kLeft_Align == paint.getTextAlign()) {
while (text < stop) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkFixed fx = SkScalarToFixed(tmsLoc.fX) + d1g.fHalfSampleX;
SkFixed fy = SkScalarToFixed(tmsLoc.fY) + d1g.fHalfSampleY;
const SkGlyph& glyph = glyphCacheProc(cache, &text,
fx & fxMask, fy & fyMask);
if (glyph.fWidth) {
proc(d1g, fx, fy, glyph);
}
pos += scalarsPerPosition;
}
} else {
while (text < stop) {
const char* currentText = text;
const SkGlyph& metricGlyph = glyphCacheProc(cache, &text, 0, 0);
if (metricGlyph.fWidth) {
SkDEBUGCODE(SkFixed prevAdvX = metricGlyph.fAdvanceX;)
SkDEBUGCODE(SkFixed prevAdvY = metricGlyph.fAdvanceY;)
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkIPoint fixedLoc;
alignProc(tmsLoc, metricGlyph, &fixedLoc);
SkFixed fx = fixedLoc.fX + d1g.fHalfSampleX;
SkFixed fy = fixedLoc.fY + d1g.fHalfSampleY;
// have to call again, now that we've been "aligned"
const SkGlyph& glyph = glyphCacheProc(cache, ¤tText,
fx & fxMask, fy & fyMask);
// the assumption is that the metrics haven't changed
SkASSERT(prevAdvX == glyph.fAdvanceX);
SkASSERT(prevAdvY == glyph.fAdvanceY);
SkASSERT(glyph.fWidth);
proc(d1g, fx, fy, glyph);
}
pos += scalarsPerPosition;
}
}
} else { // not subpixel
if (SkPaint::kLeft_Align == paint.getTextAlign()) {
while (text < stop) {
// the last 2 parameters are ignored
const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
if (glyph.fWidth) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
proc(d1g,
SkScalarToFixed(tmsLoc.fX) + SK_FixedHalf, //d1g.fHalfSampleX,
SkScalarToFixed(tmsLoc.fY) + SK_FixedHalf, //d1g.fHalfSampleY,
glyph);
}
pos += scalarsPerPosition;
}
} else {
while (text < stop) {
// the last 2 parameters are ignored
const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
if (glyph.fWidth) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkIPoint fixedLoc;
alignProc(tmsLoc, glyph, &fixedLoc);
proc(d1g,
fixedLoc.fX + SK_FixedHalf, //d1g.fHalfSampleX,
fixedLoc.fY + SK_FixedHalf, //d1g.fHalfSampleY,
glyph);
}
pos += scalarsPerPosition;
}
}
}
}
#if defined _WIN32 && _MSC_VER >= 1300
#pragma warning ( pop )
#endif
///////////////////////////////////////////////////////////////////////////////
#include "SkPathMeasure.h"
static void morphpoints(SkPoint dst[], const SkPoint src[], int count,
SkPathMeasure& meas, const SkMatrix& matrix) {
SkMatrix::MapXYProc proc = matrix.getMapXYProc();
for (int i = 0; i < count; i++) {
SkPoint pos;
SkVector tangent;
proc(matrix, src[i].fX, src[i].fY, &pos);
SkScalar sx = pos.fX;
SkScalar sy = pos.fY;
if (!meas.getPosTan(sx, &pos, &tangent)) {
// set to 0 if the measure failed, so that we just set dst == pos
tangent.set(0, 0);
}
/* This is the old way (that explains our approach but is way too slow
SkMatrix matrix;
SkPoint pt;
pt.set(sx, sy);
matrix.setSinCos(tangent.fY, tangent.fX);
matrix.preTranslate(-sx, 0);
matrix.postTranslate(pos.fX, pos.fY);
matrix.mapPoints(&dst[i], &pt, 1);
*/
dst[i].set(pos.fX - SkScalarMul(tangent.fY, sy),
pos.fY + SkScalarMul(tangent.fX, sy));
}
}
/* TODO
Need differentially more subdivisions when the follow-path is curvy. Not sure how to
determine that, but we need it. I guess a cheap answer is let the caller tell us,
but that seems like a cop-out. Another answer is to get Rob Johnson to figure it out.
*/
static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas,
const SkMatrix& matrix) {
SkPath::Iter iter(src, false);
SkPoint srcP[4], dstP[3];
SkPath::Verb verb;
while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) {
switch (verb) {
case SkPath::kMove_Verb:
morphpoints(dstP, srcP, 1, meas, matrix);
dst->moveTo(dstP[0]);
break;
case SkPath::kLine_Verb:
// turn lines into quads to look bendy
srcP[0].fX = SkScalarAve(srcP[0].fX, srcP[1].fX);
srcP[0].fY = SkScalarAve(srcP[0].fY, srcP[1].fY);
morphpoints(dstP, srcP, 2, meas, matrix);
dst->quadTo(dstP[0], dstP[1]);
break;
case SkPath::kQuad_Verb:
morphpoints(dstP, &srcP[1], 2, meas, matrix);
dst->quadTo(dstP[0], dstP[1]);
break;
case SkPath::kCubic_Verb:
morphpoints(dstP, &srcP[1], 3, meas, matrix);
dst->cubicTo(dstP[0], dstP[1], dstP[2]);
break;
case SkPath::kClose_Verb:
dst->close();
break;
default:
SkDEBUGFAIL("unknown verb");
break;
}
}
}
void SkDraw::drawTextOnPath(const char text[], size_t byteLength,
const SkPath& follow, const SkMatrix* matrix,
const SkPaint& paint) const {
SkASSERT(byteLength == 0 || text != NULL);
// nothing to draw
if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
return;
}
SkTextToPathIter iter(text, byteLength, paint, true);
SkPathMeasure meas(follow, false);
SkScalar hOffset = 0;
// need to measure first
if (paint.getTextAlign() != SkPaint::kLeft_Align) {
SkScalar pathLen = meas.getLength();
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
pathLen = SkScalarHalf(pathLen);
}
hOffset += pathLen;
}
const SkPath* iterPath;
SkScalar xpos;
SkMatrix scaledMatrix;
SkScalar scale = iter.getPathScale();
scaledMatrix.setScale(scale, scale);
while (iter.next(&iterPath, &xpos)) {
if (iterPath) {
SkPath tmp;
SkMatrix m(scaledMatrix);
m.postTranslate(xpos + hOffset, 0);
if (matrix) {
m.postConcat(*matrix);
}
morphpath(&tmp, *iterPath, meas, m);
if (fDevice) {
fDevice->drawPath(*this, tmp, iter.getPaint(), NULL, true);
} else {
this->drawPath(tmp, iter.getPaint(), NULL, true);
}
}
}
}
///////////////////////////////////////////////////////////////////////////////
typedef void (*HairProc)(const SkPoint&, const SkPoint&, const SkRasterClip&,
SkBlitter*);
static HairProc 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() {}
virtual size_t contextSize() const SK_OVERRIDE;
class TriColorShaderContext : public SkShader::Context {
public:
TriColorShaderContext(const SkTriColorShader& shader, const ContextRec&);
virtual ~TriColorShaderContext();
bool setup(const SkPoint pts[], const SkColor colors[], int, int, int);
virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
private:
SkMatrix fDstToUnit;
SkPMColor fColors[3];
typedef SkShader::Context INHERITED;
};
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTriColorShader)
protected:
SkTriColorShader(SkReadBuffer& buffer) : SkShader(buffer) {}
virtual Context* onCreateContext(const ContextRec& rec, void* storage) const SK_OVERRIDE {
return SkNEW_PLACEMENT_ARGS(storage, TriColorShaderContext, (*this, rec));
}
private:
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;
}
fDstToUnit.setConcat(im, ctmInv);
return true;
}
#include "SkColorPriv.h"
#include "SkComposeShader.h"
static int ScalarTo256(SkScalar v) {
int scale = SkScalarToFixed(v) >> 8;
if (scale < 0) {
scale = 0;
}
if (scale > 255) {
scale = 255;
}
return SkAlpha255To256(scale);
}
SkTriColorShader::TriColorShaderContext::TriColorShaderContext(const SkTriColorShader& shader,
const ContextRec& rec)
: INHERITED(shader, rec) {}
SkTriColorShader::TriColorShaderContext::~TriColorShaderContext() {}
size_t SkTriColorShader::contextSize() const {
return sizeof(TriColorShaderContext);
}
void SkTriColorShader::TriColorShaderContext::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
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
void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
const SkPoint vertices[], const SkPoint textures[],
const SkColor colors[], SkXfermode* xmode,
const uint16_t indices[], int indexCount,
const SkPaint& paint) const {
SkASSERT(0 == count || NULL != 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.
*/
SkTriColorShader triShader; // must be above declaration of p
SkPaint p(paint);
SkShader* shader = p.getShader();
if (NULL == shader) {
// if we have no shader, we ignore the texture coordinates
textures = NULL;
} else if (NULL == textures) {
// if we don't have texture coordinates, ignore the shader
p.setShader(NULL);
shader = NULL;
}
// setup the custom shader (if needed)
SkAutoTUnref<SkComposeShader> composeShader;
if (NULL != colors) {
if (NULL == textures) {
// just colors (no texture)
shader = p.setShader(&triShader);
} else {
// colors * texture
SkASSERT(shader);
bool releaseMode = false;
if (NULL == xmode) {
xmode = SkXfermode::Create(SkXfermode::kModulate_Mode);
releaseMode = true;
}
composeShader.reset(SkNEW_ARGS(SkComposeShader, (&triShader, shader, xmode)));
p.setShader(composeShader);
if (releaseMode) {
xmode->unref();
}
}
}
SkAutoBlitterChoose blitter(*fBitmap, *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 (NULL != textures || NULL != colors) {
while (vertProc(&state)) {
if (NULL != textures) {
SkMatrix tempM;
if (texture_to_matrix(state, vertices, textures, &tempM)) {
SkShader::ContextRec rec(*fBitmap, p, *fMatrix);
rec.fLocalMatrix = &tempM;
if (!blitter->resetShaderContext(rec)) {
continue;
}
}
}
if (NULL != colors) {
// Find the context for triShader.
SkTriColorShader::TriColorShaderContext* triColorShaderContext;
SkShader::Context* shaderContext = blitter->getShaderContext();
SkASSERT(shaderContext);
if (p.getShader() == &triShader) {
triColorShaderContext =
static_cast<SkTriColorShader::TriColorShaderContext*>(shaderContext);
} else {
// The shader is a compose shader and triShader is its first shader.
SkASSERT(p.getShader() == composeShader);
SkASSERT(composeShader->getShaderA() == &triShader);
SkComposeShader::ComposeShaderContext* composeShaderContext =
static_cast<SkComposeShader::ComposeShaderContext*>(shaderContext);
SkShader::Context* shaderContextA = composeShaderContext->getShaderContextA();
triColorShaderContext =
static_cast<SkTriColorShader::TriColorShaderContext*>(shaderContextA);
}
if (!triColorShaderContext->setup(vertices, colors,
state.f0, state.f1, state.f2)) {
continue;
}
}
SkPoint tmp[] = {
devVerts[state.f0], devVerts[state.f1], devVerts[state.f2]
};
SkScan::FillTriangle(tmp, *fRC, blitter.get());
}
} else {
// no colors[] and no texture, stroke hairlines with paint's color.
HairProc hairProc = ChooseHairProc(paint.isAntiAlias());
const SkRasterClip& clip = *fRC;
while (vertProc(&state)) {
hairProc(devVerts[state.f0], devVerts[state.f1], clip, blitter.get());
hairProc(devVerts[state.f1], devVerts[state.f2], clip, blitter.get());
hairProc(devVerts[state.f2], devVerts[state.f0], clip, blitter.get());
}
}
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
#ifdef SK_DEBUG
void SkDraw::validate() const {
SkASSERT(fBitmap != NULL);
SkASSERT(fMatrix != NULL);
SkASSERT(fClip != NULL);
SkASSERT(fRC != NULL);
const SkIRect& cr = fRC->getBounds();
SkIRect br;
br.set(0, 0, fBitmap->width(), fBitmap->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
{
SkRect pathBounds = devPath.getBounds();
pathBounds.inset(-SK_ScalarHalf, -SK_ScalarHalf);
pathBounds.roundOut(bounds);
}
SkIPoint margin = SkIPoint::Make(0, 0);
if (filter) {
SkASSERT(filterMatrix);
SkMask srcM, dstM;
srcM.fBounds = *bounds;
srcM.fFormat = SkMask::kA8_Format;
srcM.fImage = NULL;
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) {
SkIRect tmp = *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;
tmp.inset(-SkMin32(margin.fX, MAX_MARGIN),
-SkMin32(margin.fY, MAX_MARGIN));
if (!bounds->intersect(tmp)) {
return false;
}
}
return true;
}
static void draw_into_mask(const SkMask& mask, const SkPath& devPath,
SkPaint::Style style) {
SkBitmap bm;
SkDraw draw;
SkRasterClip clip;
SkMatrix matrix;
SkPaint paint;
bm.installPixels(SkImageInfo::MakeA8(mask.fBounds.width(), mask.fBounds.height()),
mask.fImage, mask.fRowBytes);
clip.setRect(SkIRect::MakeWH(mask.fBounds.width(), mask.fBounds.height()));
matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft),
-SkIntToScalar(mask.fBounds.fTop));
draw.fBitmap = &bm;
draw.fRC = &clip;
draw.fClip = &clip.bwRgn();
draw.fMatrix = &matrix;
paint.setAntiAlias(true);
paint.setStyle(style);
draw.drawPath(devPath, paint);
}
bool SkDraw::DrawToMask(const SkPath& devPath, const SkIRect* clipBounds,
const SkMaskFilter* filter, const SkMatrix* filterMatrix,
SkMask* mask, SkMask::CreateMode mode,
SkPaint::Style 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;
}