зеркало из https://github.com/mozilla/moz-skia.git
397 строки
11 KiB
C++
397 строки
11 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "Sk64.h"
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#include "SkGradientShader.h"
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#include "SkGraphics.h"
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#include "SkImageDecoder.h"
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#include "SkKernel33MaskFilter.h"
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#include "SkPath.h"
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#include "SkRandom.h"
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#include "SkRegion.h"
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#include "SkShader.h"
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#include "SkUtils.h"
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#include "SkColorPriv.h"
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#include "SkColorFilter.h"
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#include "SkTime.h"
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#include "SkTypeface.h"
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#include "SkXfermode.h"
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#include "SkStream.h"
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#include "SkXMLParser.h"
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static const int gKernel[3][3] = {
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// { -1, -2, -1 }, { -2, 12, -2 }, { -1, -2, -1 }
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{ 1, 2, 1 }, { 2, 64-12, 2 }, { 1, 2, 1 }
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};
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static const int gShift = 6;
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class ReduceNoise : public SkKernel33ProcMaskFilter {
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public:
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ReduceNoise(int percent256) : SkKernel33ProcMaskFilter(percent256) {}
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virtual uint8_t computeValue(uint8_t* const* srcRows)
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{
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int c = srcRows[1][1];
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int min = 255, max = 0;
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for (int i = 0; i < 3; i++)
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for (int j = 0; j < 3; j++)
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if (i != 1 || j != 1)
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{
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int v = srcRows[i][j];
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if (max < v)
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max = v;
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if (min > v)
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min = v;
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}
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if (c > max) c = max;
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// if (c < min) c = min;
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return c;
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}
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(ReduceNoise)
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private:
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ReduceNoise(SkFlattenableReadBuffer& rb) : SkKernel33ProcMaskFilter(rb) {}
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};
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class Darken : public SkKernel33ProcMaskFilter {
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public:
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Darken(int percent256) : SkKernel33ProcMaskFilter(percent256) {}
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virtual uint8_t computeValue(uint8_t* const* srcRows)
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{
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int c = srcRows[1][1];
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float f = c / 255.f;
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if (c >= 0) {
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f = sqrtf(f);
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} else {
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f *= f;
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}
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SkASSERT(f >= 0 && f <= 1);
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return (int)(f * 255);
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}
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(Darken)
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private:
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Darken(SkFlattenableReadBuffer& rb) : SkKernel33ProcMaskFilter(rb) {}
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};
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static SkMaskFilter* makemf() { return new Darken(0x30); }
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static void test_breakText() {
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SkPaint paint;
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const char* text = "sdfkljAKLDFJKEWkldfjlk#$%&sdfs.dsj";
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size_t length = strlen(text);
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SkScalar width = paint.measureText(text, length);
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SkScalar mm = 0;
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SkScalar nn = 0;
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for (SkScalar w = 0; w <= width; w += SK_Scalar1) {
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SkScalar m;
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size_t n = paint.breakText(text, length, w, &m,
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SkPaint::kBackward_TextBufferDirection);
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SkASSERT(n <= length);
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SkASSERT(m <= width);
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if (n == 0) {
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SkASSERT(m == 0);
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} else {
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// now assert that we're monotonic
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if (n == nn) {
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SkASSERT(m == mm);
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} else {
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SkASSERT(n > nn);
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SkASSERT(m > mm);
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}
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}
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nn = SkIntToScalar(n);
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mm = m;
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}
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SkDEBUGCODE(size_t length2 =) paint.breakText(text, length, width, &mm);
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SkASSERT(length2 == length);
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SkASSERT(mm == width);
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}
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static SkRandom gRand;
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class SkPowerMode : public SkXfermode {
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public:
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SkPowerMode(SkScalar exponent) { this->init(exponent); }
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virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]);
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typedef SkFlattenable* (*Factory)(SkFlattenableReadBuffer&);
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// overrides for SkFlattenable
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virtual void flatten(SkFlattenableWriteBuffer& b) {
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// this->INHERITED::flatten(b); How can we know if this is legal????
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b.write32(SkScalarToFixed(fExp));
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}
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SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPowerMode)
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private:
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SkScalar fExp; // user's value
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uint8_t fTable[256]; // cache
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void init(SkScalar exponent);
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SkPowerMode(SkFlattenableReadBuffer& b) : SkXfermode(b) {
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// read the exponent
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this->init(SkFixedToScalar(b.readS32()));
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}
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typedef SkXfermode INHERITED;
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};
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void SkPowerMode::init(SkScalar e) {
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fExp = e;
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float ee = SkScalarToFloat(e);
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printf("------ %g\n", ee);
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for (int i = 0; i < 256; i++) {
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float x = i / 255.f;
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// printf(" %d %g", i, x);
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x = powf(x, ee);
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// printf(" %g", x);
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int xx = SkScalarRound(SkFloatToScalar(x * 255));
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// printf(" %d\n", xx);
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fTable[i] = SkToU8(xx);
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}
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}
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void SkPowerMode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
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const SkAlpha aa[]) {
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for (int i = 0; i < count; i++) {
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SkPMColor c = src[i];
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int r = SkGetPackedR32(c);
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int g = SkGetPackedG32(c);
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int b = SkGetPackedB32(c);
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r = fTable[r];
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g = fTable[g];
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b = fTable[b];
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dst[i] = SkPack888ToRGB16(r, g, b);
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}
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}
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static const struct {
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const char* fName;
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uint32_t fFlags;
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bool fFlushCache;
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} gHints[] = {
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{ "Linear", SkPaint::kLinearText_Flag, false },
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{ "Normal", 0, true },
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{ "Subpixel", SkPaint::kSubpixelText_Flag, true }
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};
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static int count_char_points(const SkPaint& paint, char c) {
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SkPath path;
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paint.getTextPath(&c, 1, 0, 0, &path);
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return path.getPoints(NULL, 0);
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}
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static int gOld, gNew, gCount;
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static void dump(int c, int oldc, int newc) {
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if (oldc != newc) {
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gOld += oldc;
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gNew += newc;
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gCount += 1;
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printf("char %c: old = %3d, new = %3d, reduction %g%%\n", c, oldc, newc, 100. * (oldc - newc) / oldc);
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}
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}
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static void tab(int n) {
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// printf("[%d] ", n); return;
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SkASSERT(n >= 0);
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for (int i = 0; i < n; i++)
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printf(" ");
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}
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static void draw_rgn(const SkRegion& rgn, SkCanvas* canvas, const SkPaint& paint) {
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SkRect r;
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SkRegion::Iterator iter(rgn);
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for (; !iter.done(); iter.next()) {
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r.set(iter.rect());
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canvas->drawRect(r, paint);
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}
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}
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static void test_break(SkCanvas* canvas, const char text[], size_t length,
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SkScalar x, SkScalar y, const SkPaint& paint,
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SkScalar clickX) {
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SkPaint linePaint;
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linePaint.setAntiAlias(true);
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SkScalar measured;
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if (paint.breakText(text, length, clickX - x, &measured,
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SkPaint::kForward_TextBufferDirection)) {
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linePaint.setColor(SK_ColorRED);
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canvas->drawLine(x, y, x + measured, y, linePaint);
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}
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x += paint.measureText(text, length);
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if (paint.breakText(text, length, x - clickX, &measured,
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SkPaint::kBackward_TextBufferDirection)) {
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linePaint.setColor(SK_ColorBLUE);
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canvas->drawLine(x - measured, y, x, y, linePaint);
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}
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}
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static void DrawTheText(SkCanvas* canvas, const char text[], size_t length,
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SkScalar x, SkScalar y, const SkPaint& paint,
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SkScalar clickX, SkMaskFilter* mf) {
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SkPaint p(paint);
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#if 0
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canvas->drawText(text, length, x, y, paint);
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#else
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{
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SkPoint pts[1000];
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SkScalar xpos = x;
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SkASSERT(length <= SK_ARRAY_COUNT(pts));
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for (size_t i = 0; i < length; i++) {
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pts[i].set(xpos, y), xpos += paint.getTextSize();
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}
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canvas->drawPosText(text, length, pts, paint);
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}
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#endif
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p.setSubpixelText(true);
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x += SkIntToScalar(180);
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canvas->drawText(text, length, x, y, p);
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#ifdef SK_DEBUG
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if (true) {
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// p.setMaskFilter(mf);
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p.setSubpixelText(false);
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p.setLinearText(true);
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x += SkIntToScalar(180);
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canvas->drawText(text, length, x, y, p);
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}
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#endif
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}
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class TextSpeedView : public SampleView {
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public:
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TextSpeedView() {
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fMF = makemf();
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fHints = 0;
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fClickX = 0;
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test_breakText();
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}
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virtual ~TextSpeedView() {
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SkSafeUnref(fMF);
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "Text");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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static void make_textstrip(SkBitmap* bm) {
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bm->setConfig(SkBitmap::kRGB_565_Config, 200, 18);
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bm->allocPixels();
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bm->eraseColor(SK_ColorWHITE);
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SkCanvas canvas(*bm);
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SkPaint paint;
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const char* s = "Lorem ipsum dolor sit amet, consectetuer adipiscing elit";
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paint.setFlags(paint.getFlags() | SkPaint::kAntiAlias_Flag
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| SkPaint::kDevKernText_Flag);
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paint.setTextSize(SkIntToScalar(14));
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canvas.drawText(s, strlen(s), SkIntToScalar(8), SkIntToScalar(14), paint);
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}
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static void fill_pts(SkPoint pts[], size_t n, SkRandom* rand) {
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for (size_t i = 0; i < n; i++)
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pts[i].set(rand->nextUScalar1() * 640, rand->nextUScalar1() * 480);
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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SkAutoCanvasRestore restore(canvas, false);
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{
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SkRect r;
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r.set(0, 0, SkIntToScalar(1000), SkIntToScalar(20));
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// canvas->saveLayer(&r, NULL, SkCanvas::kHasAlphaLayer_SaveFlag);
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}
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SkPaint paint;
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// const uint16_t glyphs[] = { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19 };
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int index = fHints % SK_ARRAY_COUNT(gHints);
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index = 1;
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// const char* style = gHints[index].fName;
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// canvas->translate(0, SkIntToScalar(50));
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// canvas->drawText(style, strlen(style), SkIntToScalar(20), SkIntToScalar(20), paint);
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SkSafeUnref(paint.setTypeface(SkTypeface::CreateFromFile("/skimages/samplefont.ttf")));
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paint.setAntiAlias(true);
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paint.setFlags(paint.getFlags() | gHints[index].fFlags);
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SkRect clip;
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clip.set(SkIntToScalar(25), SkIntToScalar(34), SkIntToScalar(88), SkIntToScalar(155));
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const char* text = "Hamburgefons";
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size_t length = strlen(text);
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SkScalar y = SkIntToScalar(0);
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for (int i = 9; i <= 24; i++) {
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paint.setTextSize(SkIntToScalar(i) /*+ (gRand.nextU() & 0xFFFF)*/);
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for (SkScalar dx = 0; dx <= SkIntToScalar(3)/4;
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dx += SkIntToScalar(1) /* /4 */) {
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y += paint.getFontSpacing();
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DrawTheText(canvas, text, length, SkIntToScalar(20) + dx, y,
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paint, fClickX, fMF);
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}
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}
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if (gHints[index].fFlushCache) {
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// SkGraphics::SetFontCacheUsed(0);
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}
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}
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virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
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fClickX = x;
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this->inval(NULL);
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return this->INHERITED::onFindClickHandler(x, y);
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}
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virtual bool onClick(Click* click) {
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return this->INHERITED::onClick(click);
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}
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private:
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int fHints;
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SkScalar fClickX;
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SkMaskFilter* fMF;
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new TextSpeedView; }
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static SkViewRegister reg(MyFactory);
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