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* Copyright 2017 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkAtlasTextTarget_DEFINED
#define SkAtlasTextTarget_DEFINED
#include "include/core/SkDeque.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include <memory>
class SkAtlasTextContext;
class SkAtlasTextFont;
class SkMatrix;
struct SkPoint;
/** Represents a client-created renderable surface and is used to draw text into the surface. */
class SK_API SkAtlasTextTarget {
virtual ~SkAtlasTextTarget();
* Creates a text drawing target. ‘handle’ is used to identify this rendering surface when
* draws are flushed to the SkAtlasTextContext's SkAtlasTextRenderer.
static std::unique_ptr<SkAtlasTextTarget> Make(sk_sp<SkAtlasTextContext>,
int width,
int height,
void* handle);
* Enqueues a text draw in the target. The caller provides an array of glyphs and their
* positions. The meaning of 'color' here is interpreted by the client's SkAtlasTextRenderer
* when it actually renders the text.
virtual void drawText(const SkGlyphID[], const SkPoint[], int glyphCnt, uint32_t color,
const SkAtlasTextFont&) = 0;
/** Issues all queued text draws to SkAtlasTextRenderer. */
virtual void flush() = 0;
int width() const { return fWidth; }
int height() const { return fHeight; }
void* handle() const { return fHandle; }
SkAtlasTextContext* context() const { return fContext.get(); }
/** Saves the current matrix in a stack. Returns the prior depth of the saved matrix stack. */
int save();
/** Pops the top matrix on the stack if the stack is not empty. */
void restore();
* Pops the matrix stack until the stack depth is count. Does nothing if the depth is already
* less than count.
void restoreToCount(int count);
/** Pre-translates the current CTM. */
void translate(SkScalar dx, SkScalar dy);
/** Pre-scales the current CTM. */
void scale(SkScalar sx, SkScalar sy);
/** Pre-rotates the current CTM about the origin. */
void rotate(SkScalar degrees);
/** Pre-rotates the current CTM about the (px, py). */
void rotate(SkScalar degrees, SkScalar px, SkScalar py);
/** Pre-skews the current CTM. */
void skew(SkScalar sx, SkScalar sy);
/** Pre-concats the current CTM. */
void concat(const SkMatrix& matrix);
SkAtlasTextTarget(sk_sp<SkAtlasTextContext>, int width, int height, void* handle);
const SkMatrix& ctm() const { return *static_cast<const SkMatrix*>(fMatrixStack.back()); }
void* const fHandle;
const sk_sp<SkAtlasTextContext> fContext;
const int fWidth;
const int fHeight;
SkDeque fMatrixStack;
int fSaveCnt;
SkMatrix* accessCTM() const {
return static_cast<SkMatrix*>(const_cast<void*>(fMatrixStack.back()));
SkAtlasTextTarget() = delete;
SkAtlasTextTarget(const SkAtlasTextContext&) = delete;
SkAtlasTextTarget& operator=(const SkAtlasTextContext&) = delete;