moz-skia/samplecode/SampleText.cpp

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22 KiB
C++
Исходник Обычный вид История

#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "Sk64.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkKernel33MaskFilter.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "SkXfermode.h"
#include "SkStream.h"
#include "SkXMLParser.h"
static const int gKernel[3][3] = {
// { -1, -2, -1 }, { -2, 12, -2 }, { -1, -2, -1 }
{ 1, 2, 1 }, { 2, 64-12, 2 }, { 1, 2, 1 }
};
static const int gShift = 6;
class ReduceNoise : public SkKernel33ProcMaskFilter {
public:
ReduceNoise(int percent256) : SkKernel33ProcMaskFilter(percent256) {}
virtual uint8_t computeValue(uint8_t* const* srcRows)
{
int c = srcRows[1][1];
int min = 255, max = 0;
for (int i = 0; i < 3; i++)
for (int j = 0; j < 3; j++)
if (i != 1 || j != 1)
{
int v = srcRows[i][j];
if (max < v)
max = v;
if (min > v)
min = v;
}
if (c > max) c = max;
// if (c < min) c = min;
return c;
}
virtual Factory getFactory() { return Create; }
private:
ReduceNoise(SkFlattenableReadBuffer& rb) : SkKernel33ProcMaskFilter(rb) {}
static SkFlattenable* Create(SkFlattenableReadBuffer& rb)
{
return new ReduceNoise(rb);
}
};
class Darken : public SkKernel33ProcMaskFilter {
public:
Darken(int percent256) : SkKernel33ProcMaskFilter(percent256) {}
virtual uint8_t computeValue(uint8_t* const* srcRows)
{
int c = srcRows[1][1];
float f = c / 255.f;
if (c >= 0)
{
f = sqrtf(f);
}
else
{
f *= f;
}
SkASSERT(f >= 0 && f <= 1);
return (int)(f * 255);
}
virtual Factory getFactory() { return Create; }
private:
Darken(SkFlattenableReadBuffer& rb) : SkKernel33ProcMaskFilter(rb) {}
static SkFlattenable* Create(SkFlattenableReadBuffer& rb)
{
return new Darken(rb);
}
};
static SkMaskFilter* makemf() { return new Darken(0x30); }
//#ifdef TEST_CLICKX
static void test_typefaceCache()
{
#ifdef ANDROID
SkTypeface* t0 = SkTypeface::CreateFromName("sans-serif",
SkTypeface::kNormal);
SkTypeface* t1 = SkTypeface::CreateFromName(NULL, SkTypeface::kNormal);
SkTypeface* t2 = SkTypeface::CreateFromName("arial", SkTypeface::kNormal);
SkTypeface* t3 = SkTypeface::CreateFromName("helvetica", SkTypeface::kItalic);
SkASSERT(t0 == t1);
SkASSERT(t0 == t2);
SkASSERT(t0 == t3);
#endif
}
static void test_breakText()
{
SkPaint paint;
const char* text = "sdfkljAKLDFJKEWkldfjlk#$%&sdfs.dsj";
size_t length = strlen(text);
SkScalar width = paint.measureText(text, length);
SkScalar mm = 0;
SkScalar nn = 0;
for (SkScalar w = 0; w <= width; w += SK_Scalar1)
{
SkScalar m;
size_t n = paint.breakText(text, length, w, &m,
SkPaint::kBackward_TextBufferDirection);
SkASSERT(n <= length);
SkASSERT(m <= width);
if (n == 0)
SkASSERT(m == 0);
else
{
// now assert that we're monotonic
if (n == nn)
SkASSERT(m == mm);
else
{
SkASSERT(n > nn);
SkASSERT(m > mm);
}
}
nn = SkIntToScalar(n);
mm = m;
}
int length2 = paint.breakText(text, length, width, &mm);
SkASSERT(length2 == length);
SkASSERT(mm == width);
}
static SkRandom gRand;
class SkPowerMode : public SkXfermode {
public:
SkPowerMode(SkScalar exponent) { this->init(exponent); }
virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count, const SkAlpha aa[]);
typedef SkFlattenable* (*Factory)(SkFlattenableReadBuffer&);
// overrides for SkFlattenable
virtual Factory getFactory() { return Create; }
virtual void flatten(SkFlattenableWriteBuffer& b)
{
// this->INHERITED::flatten(b); How can we know if this is legal????
b.write32(SkScalarToFixed(fExp));
}
private:
SkScalar fExp; // user's value
uint8_t fTable[256]; // cache
void init(SkScalar exponent);
SkPowerMode(SkFlattenableReadBuffer& b) : SkXfermode(b)
{
// read the exponent
this->init(SkFixedToScalar(b.readS32()));
}
static SkFlattenable* Create(SkFlattenableReadBuffer& b)
{
return SkNEW_ARGS(SkPowerMode, (b));
}
typedef SkXfermode INHERITED;
};
void SkPowerMode::init(SkScalar e)
{
fExp = e;
float ee = SkScalarToFloat(e);
printf("------ %g\n", ee);
for (int i = 0; i < 256; i++)
{
float x = i / 255.f;
// printf(" %d %g", i, x);
x = powf(x, ee);
// printf(" %g", x);
int xx = SkScalarRound(SkFloatToScalar(x * 255));
// printf(" %d\n", xx);
fTable[i] = SkToU8(xx);
}
}
void SkPowerMode::xfer16(uint16_t dst[], const SkPMColor src[], int count, const SkAlpha aa[])
{
for (int i = 0; i < count; i++)
{
SkPMColor c = src[i];
int r = SkGetPackedR32(c);
int g = SkGetPackedG32(c);
int b = SkGetPackedB32(c);
r = fTable[r];
g = fTable[g];
b = fTable[b];
dst[i] = SkPack888ToRGB16(r, g, b);
}
}
static const struct {
const char* fName;
uint32_t fFlags;
bool fFlushCache;
} gHints[] = {
{ "Linear", SkPaint::kLinearText_Flag, false },
{ "Normal", 0, true },
{ "Subpixel", SkPaint::kSubpixelText_Flag, true }
};
#ifdef SK_DEBUG
#define REPEAT_COUNT 1
#else
#define REPEAT_COUNT 5
#endif
static int count_char_points(const SkPaint& paint, char c)
{
SkPath path;
paint.getTextPath(&c, 1, 0, 0, &path);
return path.getPoints(NULL, 0);
}
static int gOld, gNew, gCount;
static void dump(int c, int oldc, int newc)
{
if (oldc != newc)
{
gOld += oldc;
gNew += newc;
gCount += 1;
printf("char %c: old = %3d, new = %3d, reduction %g%%\n", c, oldc, newc, 100. * (oldc - newc) / oldc);
}
}
static void tab(int n)
{
// printf("[%d] ", n); return;
SkASSERT(n >= 0);
for (int i = 0; i < n; i++)
printf(" ");
}
#if 0
#include "badrects.cpp"
static void make_badrgn(SkRegion* rgn, int insetAmount)
{
SkRect16 r, bounds;
int i;
rgn->setEmpty();
bounds.setEmpty();
for (i = 0; i < SK_ARRAY_COUNT(badrects); i++)
{
SkASSERT(badrects[i].width > 0 && badrects[i].height > 0);
r.set(badrects[i].x, badrects[i].y, badrects[i].x + badrects[i].width, badrects[i].y + badrects[i].height);
r.inset(insetAmount, insetAmount);
rgn->op(r, SkRegion::kUnion_Op);
bounds.join(r);
}
SkASSERT(bounds == rgn->getBounds());
for (i = 0; i < SK_ARRAY_COUNT(badrects); i++)
{
r.set(badrects[i].x, badrects[i].y, badrects[i].x + badrects[i].width, badrects[i].y + badrects[i].height);
SkASSERT(rgn->contains(r));
}
}
#endif
static void draw_rgn(const SkRegion& rgn, SkCanvas* canvas, const SkPaint& paint)
{
SkRect r;
SkRegion::Iterator iter(rgn);
for (; !iter.done(); iter.next())
{
r.set(iter.rect());
canvas->drawRect(r, paint);
}
}
static void test_break(SkCanvas* canvas, const char text[], size_t length,
SkScalar x, SkScalar y, const SkPaint& paint,
SkScalar clickX)
{
SkPaint linePaint;
linePaint.setAntiAlias(true);
SkScalar measured;
if (paint.breakText(text, length, clickX - x, &measured, SkPaint::kForward_TextBufferDirection))
{
linePaint.setColor(SK_ColorRED);
canvas->drawLine(x, y, x + measured, y, linePaint);
}
x += paint.measureText(text, length);
if (paint.breakText(text, length, x - clickX, &measured, SkPaint::kBackward_TextBufferDirection))
{
linePaint.setColor(SK_ColorBLUE);
canvas->drawLine(x - measured, y, x, y, linePaint);
}
}
static void test_poly()
{
static const SkPoint dst[] = {
SkIntToScalar(2), SkIntToScalar(1),
SkIntToScalar(5), SkIntToScalar(1),
SkIntToScalar(5), SkIntToScalar(3),
SkIntToScalar(2), SkIntToScalar(3)
};
static const SkPoint src[] = {
SkIntToScalar(0), SkIntToScalar(0),
SkIntToScalar(1), SkIntToScalar(0),
SkIntToScalar(1), SkIntToScalar(1),
SkIntToScalar(0), SkIntToScalar(1)
};
SkMatrix matrix;
if (matrix.setPolyToPoly(src, dst, 4))
{
SkPoint pt = { SK_Scalar1/2, SK_Scalar1/2 };
matrix.mapPoints(&pt, 1);
printf("---- x = %g y = %g\n", SkScalarToFloat(pt.fX), SkScalarToFloat(pt.fY));
}
else
printf("---- setPolyToPoly failed\n");
}
#include "SkColorShader.h"
static void DrawTheText(SkCanvas* canvas, const char text[], size_t length,
SkScalar x, SkScalar y, const SkPaint& paint,
SkScalar clickX, SkMaskFilter* mf)
{
SkPaint p(paint);
#if 0
canvas->drawText(text, length, x, y, paint);
#else
{
SkPoint pts[1000];
SkScalar xpos = x;
SkASSERT(length <= SK_ARRAY_COUNT(pts));
for (size_t i = 0; i < length; i++)
pts[i].set(xpos, y), xpos += paint.getTextSize();
canvas->drawPosText(text, length, pts, paint);
}
#endif
p.setSubpixelText(true);
x += SkIntToScalar(180);
canvas->drawText(text, length, x, y, p);
#ifdef TEST_CLICKX
test_break(canvas, text, length, x, y, p, clickX);
#endif
#ifdef SK_DEBUG
if (false)
{
SkColorShader shader;
p.setShader(&shader);
x += SkIntToScalar(180);
canvas->drawText(text, length, x, y, p);
p.setShader(NULL);
}
if (true)
{
// p.setMaskFilter(mf);
p.setSubpixelText(false);
p.setLinearText(true);
x += SkIntToScalar(180);
canvas->drawText(text, length, x, y, p);
}
#endif
}
class TextSpeedView : public SkView {
public:
TextSpeedView()
{
fMF = makemf();
fHints = 0;
if (false)
{
static const char extra[] = { '.', ',', ':', ';', '!' };
SkPaint paint, paint2;
paint2.setTypeface(SkTypeface::CreateFromName(NULL,
SkTypeface::kItalic))->unref();
for (int i = 0; i < 26; i++)
::dump('a' + i, count_char_points(paint, 'a' + i), count_char_points(paint2, 'a' + i));
for (int j = 0; j < SK_ARRAY_COUNT(extra); j++)
::dump(extra[j], count_char_points(paint, extra[j]), count_char_points(paint2, extra[j]));
printf("--- ave reduction = %g%%\n", 100. * (gOld - gNew) / gOld);
}
if (true)
{
SkPoint pts[] = { SkIntToScalar(20), 0, SkIntToScalar(256+20), 0 };
SkColor colors[] = { SkColorSetARGB(0, 255, 255, 255), SkColorSetARGB(255, 255, 255, 255) };
fGradient = SkGradientShader::CreateLinear(pts, colors, NULL, 2, SkShader::kClamp_TileMode);
}
fClickX = 0;
test_breakText();
test_typefaceCache();
// test_poly();
}
virtual ~TextSpeedView()
{
fGradient->unref();
SkSafeUnref(fMF);
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt)
{
if (SampleCode::TitleQ(*evt))
{
SampleCode::TitleR(evt, "Text");
return true;
}
return this->INHERITED::onQuery(evt);
}
void drawBG(SkCanvas* canvas)
{
// canvas->drawColor(0xFFDDDDDD);
canvas->drawColor(SK_ColorWHITE);
// canvas->drawColor(SK_ColorBLACK);
}
static void make_textstrip(SkBitmap* bm)
{
bm->setConfig(SkBitmap::kRGB_565_Config, 200, 18);
bm->allocPixels();
bm->eraseColor(SK_ColorWHITE);
SkCanvas canvas(*bm);
SkPaint paint;
const char* s = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit";
paint.setFlags(paint.getFlags() | SkPaint::kAntiAlias_Flag
| SkPaint::kDevKernText_Flag);
paint.setTextSize(SkIntToScalar(14));
canvas.drawText(s, strlen(s), SkIntToScalar(8), SkIntToScalar(14), paint);
}
static void fill_pts(SkPoint pts[], size_t n, SkRandom* rand)
{
for (size_t i = 0; i < n; i++)
pts[i].set(rand->nextUScalar1() * 640, rand->nextUScalar1() * 480);
}
virtual void onDraw(SkCanvas* canvas)
{
inval(NULL);
if (false)
{
canvas->translate(SkIntToScalar(480), 0);
canvas->rotate(SkIntToScalar(90));
}
this->drawBG(canvas);
if (false)
{
SkPaint p;
p.setAntiAlias(true);
p.setSubpixelText(true);
// p.setLinearText(true);
SkScalar size = SkIntToScalar(6);
SkMSec dur = 0;
const int LOOP = 16;
const int TIMES = 10;
for (int times = 0; times < TIMES; times++)
{
SkMSec now = SkTime::GetMSecs();
for (int loop = 0; loop < LOOP; loop++)
{
p.setTextSize(size);
size += SK_Scalar1/5;
canvas->drawText("Hamburgefons", 12, SkIntToScalar(10), SkIntToScalar(50), p);
}
dur += SkTime::GetMSecs() - now;
SkGraphics::SetFontCacheUsed(0);
}
printf("----- duration = %g\n", dur * 1.0 / TIMES);
this->inval(NULL);
return;
}
if (false)
{
SkPaint p;
p.setAntiAlias(true);
for (int i = 6; i <= 36; i++)
{
SkRect r;
SkPaint::FontMetrics m;
p.setTextSize(SkIntToScalar(i));
p.getFontMetrics(&m);
int ascent = SkScalarRound(m.fAscent);
int descent = SkScalarRound(m.fDescent);
for (uint8_t c = ' '; c <= 127; c++)
{
p.getTextWidths(&c, 1, NULL, &r);
if (SkScalarRound(r.fTop) < ascent)
printf("PS %d --- %c [%d] top=%g, ascent=%g ymax=%g\n", i, c, c,
SkScalarToFloat(r.fTop), SkScalarToFloat(m.fAscent), SkScalarToFloat(m.fTop));
if (SkScalarRound(r.fBottom) > descent)
printf("PS %d --- %c [%d] bottom=%g, descent=%g ymin=%g\n", i, c, c,
SkScalarToFloat(r.fBottom), SkScalarToFloat(m.fDescent), SkScalarToFloat(m.fBottom));
}
}
}
if (false)
{
SkPaint p;
p.setShader(fGradient);
#ifdef SK_RELEASE
SkMSec now = SkTime::GetMSecs();
for (int i = 0; i < 100; i++)
#endif
canvas->drawPaint(p);
#ifdef SK_RELEASE
printf("----- %d ms\n", SkTime::GetMSecs() - now);
this->inval(NULL);
#endif
return;
}
if (false)
{
SkBitmap bm;
make_textstrip(&bm);
canvas->translate(0, SkIntToScalar(50));
for (int i = 0; i < 10; i++)
{
float gamma = 1 + i * 0.2f;
SkPowerMode mode(SkFloatToScalar(1 / gamma));
SkPaint p;
p.setXfermode(&mode);
canvas->drawBitmap(bm, 0, SkIntToScalar(i) * bm.height(), &p);
}
return;
}
if (false)
{
SkPaint paint;
paint.setAntiAlias(true);
paint.setDevKernText(true);
SkMSec now = SkTime::GetMSecs();
for (int i = 0; i < 1000000; i++)
{
paint.measureText("Hamburgefons", 15, NULL, NULL);
}
printf("--------- measure %d\n", SkTime::GetMSecs() - now);
this->inval(NULL);
return;
}
if (false)
{
SkRegion rgn;
SkPath path;
SkPaint paint;
// make_badrgn(&rgn, -2);
if (false)
{
paint.setColor(SK_ColorBLUE);
canvas->drawIRect(rgn.getBounds(), paint);
}
paint.setColor(SK_ColorRED);
draw_rgn(rgn, canvas, paint);
rgn.getBoundaryPath(&path);
paint.setARGB(0x80, 0, 0, 0xFF);
canvas->drawPath(path, paint);
return;
}
if (false)
{
SkRect r = { SkIntToScalar(50), SkIntToScalar(50), SkIntToScalar(300), SkIntToScalar(300) };
SkPaint p;
p.setStyle(SkPaint::kStroke_Style);
p.setAlpha(0x80);
p.setStrokeWidth(SkIntToScalar(20));
canvas->drawRect(r, p);
}
if (false)
{
SkPaint p;
SkRect r = { SkIntToScalar(100), SkIntToScalar(100), SkIntToScalar(104), SkIntToScalar(104) };
// r.offset(SK_ScalarHalf, SK_ScalarHalf);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SK_Scalar1*2);
// p.setAntiAliasOn(true);
canvas->drawRect(r, p);
return;
}
if (false)
{
Sk64 aa, bb;
int64_t a = (int64_t)6062080 * -30596;
int64_t b = (int64_t)4816896 * 57957;
aa.setMul(6062080, -30596);
bb.setMul(4816896, 57957);
a += b;
b = a >> 16;
// SkFixed c = aa.addGetFixed(bb);
printf("%d %d\n", (int)a, a >> 32);
SkBitmap bm;
SkPaint paint;
SkScalar scale = SkFloatToScalar(0.5625f);
SkScalar x = SkIntToScalar(100);
SkScalar y = SkIntToScalar(100);
//paint.setFilterType(SkPaint::kBilinear_FilterType);
SkImageDecoder::DecodeFile("/app_web_browser.png", &bm);
// canvas->drawBitmap(bm, x, y, paint);
x += SkIntToScalar(100);
canvas->save();
canvas->translate(x, y);
canvas->scale(SkIntToScalar(2)/1, SkIntToScalar(2)/1);
canvas->translate(-x, -y);
canvas->drawBitmap(bm, x, y, &paint);
canvas->restore();
x += SkIntToScalar(100);
canvas->save();
canvas->translate(x, y);
canvas->scale(scale, scale);
canvas->translate(-x, -y);
// canvas->drawBitmap(bm, x, y, paint);
canvas->restore();
return;
}
SkAutoCanvasRestore restore(canvas, false);
{
SkRect r;
r.set(0, 0, SkIntToScalar(1000), SkIntToScalar(20));
// canvas->saveLayer(&r, NULL, SkCanvas::kHasAlphaLayer_SaveFlag);
}
SkPaint paint;
// const uint16_t glyphs[] = { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 };
int index = fHints % SK_ARRAY_COUNT(gHints);
index = 1;
// const char* style = gHints[index].fName;
// canvas->translate(0, SkIntToScalar(50));
// canvas->drawText(style, strlen(style), SkIntToScalar(20), SkIntToScalar(20), paint);
SkSafeUnref(paint.setTypeface(SkTypeface::CreateFromFile("/skimages/samplefont.ttf")));
paint.setAntiAlias(true);
paint.setFlags(paint.getFlags() | gHints[index].fFlags);
SkMSec now = 0;
if (REPEAT_COUNT > 1)
now = SkTime::GetMSecs();
SkRect clip;
clip.set(SkIntToScalar(25), SkIntToScalar(34), SkIntToScalar(88), SkIntToScalar(155));
if (0) {
canvas->clipRect(clip);
}
if (0) {
SkPath clipPath;
clipPath.addOval(clip);
canvas->clipPath(clipPath);
}
const char* text = "Hamburgefons";
size_t length = strlen(text);
#ifdef TEST_CLICKX
{
SkPaint p;
p.setColor(SK_ColorGREEN);
p.setAntiAlias(true);
canvas->drawLine(fClickX, 0, fClickX, SkIntToScalar(1000), p);
}
#endif
for (int j = 0; j < REPEAT_COUNT; j++)
{
SkScalar y = SkIntToScalar(0);
for (int i = 9; i <= 24; i++) {
paint.setTextSize(SkIntToScalar(i) /*+ (gRand.nextU() & 0xFFFF)*/);
for (SkScalar dx = 0; dx <= SkIntToScalar(3)/4; dx += SkIntToScalar(1) /* /4 */)
{
y += paint.getFontSpacing();
DrawTheText(canvas, text, length, SkIntToScalar(20) + dx, y, paint, fClickX, fMF);
}
}
if (gHints[index].fFlushCache) {
// SkGraphics::SetFontCacheUsed(0);
}
}
if (REPEAT_COUNT > 1)
{
printf("--------- FPS = %g\n", REPEAT_COUNT * 1000. / (SkTime::GetMSecs() - now));
this->inval(NULL);
}
}
virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y)
{
fClickX = x;
this->inval(NULL);
return this->INHERITED::onFindClickHandler(x, y);
}
virtual bool onClick(Click* click)
{
return this->INHERITED::onClick(click);
}
private:
int fHints;
SkScalar fClickX;
SkMaskFilter* fMF;
SkShader* fGradient;
typedef SkView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new TextSpeedView; }
static SkViewRegister reg(MyFactory);