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* Copyright 2014 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef ToolUtils_DEFINED
#define ToolUtils_DEFINED
#include "include/core/SkColor.h"
#include "include/core/SkFontArguments.h"
#include "include/core/SkFontParameters.h"
#include "include/core/SkFontStyle.h"
#include "include/core/SkPixmap.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSpan.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTypeface.h" // IWYU pragma: keep
#include "include/core/SkTypes.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkTArray.h"
#include "include/private/base/SkTDArray.h"
#include "src/base/SkRandom.h"
#include "src/base/SkTInternalLList.h"
#include <cstddef>
#include <cstdint>
#include <memory>
#include <vector>
#include <functional>
class SkBitmap;
class SkCanvas;
class SkFont;
class SkImage;
class SkMatrix;
class SkMetaData;
class SkPaint;
class SkPath;
class SkShader;
class SkSurfaceProps;
class SkTextBlobBuilder;
enum SkAlphaType : int;
enum SkColorType : int;
enum class SkTextEncoding;
enum class SkTileMode;
struct SkImageInfo;
namespace ToolUtils {
const char* alphatype_name (SkAlphaType);
const char* colortype_name (SkColorType);
const char* colortype_depth(SkColorType); // like colortype_name, but channel order agnostic
const char* tilemode_name(SkTileMode);
* Map opaque colors from 8888 to 565.
SkColor color_to_565(SkColor color);
void get_text_path(const SkFont&,
const void* text,
size_t length,
const SkPoint* positions = nullptr);
* Returns true iff all of the pixels between the two images are identical.
* If the configs differ, return false.
bool equal_pixels(const SkPixmap&, const SkPixmap&);
bool equal_pixels(const SkBitmap&, const SkBitmap&);
bool equal_pixels(const SkImage* a, const SkImage* b);
/** Returns a newly created CheckerboardShader. */
sk_sp<SkShader> create_checkerboard_shader(SkColor c1, SkColor c2, int size);
/** Draw a checkerboard pattern in the current canvas, restricted to
the current clip, using SkBlendMode::kSrc. */
void draw_checkerboard(SkCanvas* canvas, SkColor color1, SkColor color2, int checkSize);
/** Make it easier to create a bitmap-based checkerboard */
SkBitmap create_checkerboard_bitmap(int w, int h, SkColor c1, SkColor c2, int checkSize);
sk_sp<SkImage> create_checkerboard_image(int w, int h, SkColor c1, SkColor c2, int checkSize);
/** A default checkerboard. */
inline void draw_checkerboard(SkCanvas* canvas) {
ToolUtils::draw_checkerboard(canvas, 0xFF999999, 0xFF666666, 8);
class HilbertGenerator {
HilbertGenerator(float desiredSize, float desiredLineWidth, int desiredDepth);
// Draw a Hilbert curve into the canvas w/ a gradient along its length
void draw(SkCanvas* canvas);
void turn90(bool turnLeft);
void line(SkCanvas* canvas);
void recursiveDraw(SkCanvas* canvas, int curDepth, bool turnLeft);
SkColor4f getColor(float curLen);
const float fDesiredSize;
const int fDesiredDepth;
const float fSegmentLength; // length of a line segment
const float fDesiredLineWidth;
SkRect fActualBounds;
// The "turtle" state
SkPoint fCurPos;
int fCurDir;
const float fExpectedLen;
float fCurLen;
/** Create pixmaps to initialize a 32x32 image w/ or w/o mipmaps.
* Returns the number of levels (either 1 or 6). The mipmap levels will be colored as
* specified in 'colors'
int make_pixmaps(SkColorType,
bool withMips,
const SkColor4f colors[6],
SkPixmap pixmaps[6],
std::unique_ptr<char[]>* mem);
// If the canvas doesn't make a surface (e.g. recording), make a raster surface
sk_sp<SkSurface> makeSurface(SkCanvas*, const SkImageInfo&, const SkSurfaceProps* = nullptr);
// A helper for inserting a drawtext call into a SkTextBlobBuilder
void add_to_text_blob_w_len(SkTextBlobBuilder*,
const char* text,
size_t len,
const SkFont&,
SkScalar x,
SkScalar y);
void add_to_text_blob(SkTextBlobBuilder*, const char* text, const SkFont&, SkScalar x, SkScalar y);
// Constructs a star by walking a 'numPts'-sided regular polygon with even/odd fill:
// moveTo(pts[0]);
// lineTo(pts[step % numPts]);
// ...
// lineTo(pts[(step * (N - 1)) % numPts]);
// numPts=5, step=2 will produce a classic five-point star.
// numPts and step must be co-prime.
SkPath make_star(const SkRect& bounds, int numPts = 5, int step = 2);
void create_hemi_normal_map(SkBitmap* bm, const SkIRect& dst);
void create_frustum_normal_map(SkBitmap* bm, const SkIRect& dst);
void create_tetra_normal_map(SkBitmap* bm, const SkIRect& dst);
// A helper object to test the topological sorting code (TopoSortBench.cpp & TopoSortTest.cpp)
class TopoTestNode : public SkRefCnt {
TopoTestNode(int id) : fID(id) {}
void dependsOn(TopoTestNode* src) { *fDependencies.append() = src; }
void targets(uint32_t target) { *fTargets.append() = target; }
int id() const { return fID; }
void reset() {
fOutputPos = 0;
fTempMark = false;
fWasOutput = false;
uint32_t outputPos() const {
return fOutputPos;
// check that the topological sort is valid for this node
bool check() {
if (!fWasOutput) {
return false;
for (int i = 0; i < fDependencies.size(); ++i) {
if (!fDependencies[i]->fWasOutput) {
return false;
// This node should've been output after all the nodes on which it depends
if (fOutputPos < fDependencies[i]->outputPos()) {
return false;
return true;
// The following 7 methods are needed by the topological sort
static void SetTempMark(TopoTestNode* node) { node->fTempMark = true; }
static void ResetTempMark(TopoTestNode* node) { node->fTempMark = false; }
static bool IsTempMarked(TopoTestNode* node) { return node->fTempMark; }
static void Output(TopoTestNode* node, uint32_t outputPos) {
node->fOutputPos = outputPos;
node->fWasOutput = true;
static bool WasOutput(TopoTestNode* node) { return node->fWasOutput; }
static uint32_t GetIndex(TopoTestNode* node) { return node->outputPos(); }
static int NumDependencies(TopoTestNode* node) { return node->fDependencies.size(); }
static TopoTestNode* Dependency(TopoTestNode* node, int index) {
return node->fDependencies[index];
static int NumTargets(TopoTestNode* node) { return node->fTargets.size(); }
static uint32_t GetTarget(TopoTestNode* node, int i) { return node->fTargets[i]; }
static uint32_t GetID(TopoTestNode* node) { return node->id(); }
// Helper functions for TopoSortBench & TopoSortTest
static void AllocNodes(skia_private::TArray<sk_sp<ToolUtils::TopoTestNode>>* graph, int num) {
graph->reserve_exact(graph->size() + num);
for (int i = 0; i < num; ++i) {
graph->push_back(sk_sp<TopoTestNode>(new TopoTestNode(i)));
#ifdef SK_DEBUG
static void Print(const skia_private::TArray<TopoTestNode*>& graph) {
for (int i = 0; i < graph.size(); ++i) {
SkDebugf("%d, ", graph[i]->id());
// randomize the array
static void Shuffle(SkSpan<sk_sp<TopoTestNode>> graph, SkRandom* rand) {
for (size_t i = graph.size() - 1; i > 0; --i) {
int swap = rand->nextU() % (i + 1);
int fID;
uint32_t fOutputPos = 0;
bool fTempMark = false;
bool fWasOutput = false;
SkTDArray<TopoTestNode*> fDependencies;
SkTDArray<uint32_t> fTargets;
bool copy_to(SkBitmap* dst, SkColorType dstCT, const SkBitmap& src);
void copy_to_g8(SkBitmap* dst, const SkBitmap& src);
class PixelIter {
PixelIter(SkSurface* surf) {
SkPixmap pm;
if (!surf->peekPixels(&pm)) {
void reset(const SkPixmap& pm) {
fPM = pm;
fLoc = {-1, 0};
void* next(SkIPoint* loc = nullptr) {
if (!fPM.addr()) {
return nullptr;
fLoc.fX += 1;
if (fLoc.fX >= fPM.width()) {
fLoc.fX = 0;
if (++fLoc.fY >= fPM.height()) {
return nullptr;
if (loc) {
*loc = fLoc;
return fPM.writable_addr(fLoc.fX, fLoc.fY);
void setDone() { fPM.reset(); }
SkPixmap fPM;
SkIPoint fLoc;
using PathSniffCallback = void(const SkMatrix&, const SkPath&, const SkPaint&);
// Calls the provided PathSniffCallback for each path in the given file.
// Supported file formats .skp. (See SvgPathExtractor for .svg)
void ExtractPathsFromSKP(const char filepath[], std::function<PathSniffCallback>);
// Initialised with a font, this class can be called to setup GM UI with sliders for font
// variations, and returns a set of variation coordinates that matches what the sliders in the UI
// are set to. Useful for testing variable font properties, see colrv1.cpp.
class VariationSliders {
VariationSliders() {}
SkFontArguments::VariationPosition variationPosition = {nullptr, 0});
bool writeControls(SkMetaData* controls);
/* Scans controls for information about the variation axes that the user may have configured.
* Optionally pass in a boolean to receive information on whether the axes were updated. */
void readControls(const SkMetaData& controls, bool* changed = nullptr);
SkSpan<const SkFontArguments::VariationPosition::Coordinate> getCoordinates();
static SkString tagToString(SkFourByteTag tag);
struct AxisSlider {
SkScalar current;
SkFontParameters::Variation::Axis axis;
SkString name;
std::vector<AxisSlider> fAxisSliders;
std::unique_ptr<SkFontArguments::VariationPosition::Coordinate[]> fCoords;
static constexpr size_t kAxisVarsSize = 3;
} // namespace ToolUtils
#endif // ToolUtils_DEFINED