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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkSurface.h"
#include "SkTypeface.h"
namespace skiagm {
class DFTextGM : public GM {
public:
DFTextGM() {
this->setBGColor(0xFFFFFFFF);
}
virtual ~DFTextGM() {
}
protected:
virtual uint32_t onGetFlags() const SK_OVERRIDE {
return kGPUOnly_Flag;
}
virtual SkString onShortName() {
return SkString("dftext");
}
virtual SkISize onISize() {
return SkISize::Make(1024, 768);
}
static void rotate_about(SkCanvas* canvas,
SkScalar degrees,
SkScalar px, SkScalar py) {
canvas->translate(px, py);
canvas->rotate(degrees);
canvas->translate(-px, -py);
}
virtual void onDraw(SkCanvas* inputCanvas) {
SkScalar textSizes[] = { 11.0f, 11.0f*2.0f, 11.0f*5.0f, 11.0f*2.0f*5.0f };
SkScalar scales[] = { 2.0f*5.0f, 5.0f, 2.0f, 1.0f };
// set up offscreen rendering with distance field text
#if SK_SUPPORT_GPU
GrContext* ctx = inputCanvas->getGrContext();
SkImageInfo info = SkImageInfo::MakeN32Premul(onISize());
SkSurfaceProps props(SkSurfaceProps::kUseDistanceFieldFonts_Flag,
SkSurfaceProps::kLegacyFontHost_InitType);
SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(ctx, info, 0, &props));
SkCanvas* canvas = surface.get() ? surface->getCanvas() : inputCanvas;
#else
SkCanvas* canvas = inputCanvas;
#endif
// apply global scale to test glyph positioning
canvas->scale(1.05f, 1.05f);
canvas->clear(0xffffffff);
SkPaint paint;
paint.setAntiAlias(true);
paint.setSubpixelText(true);
#if !SK_SUPPORT_GPU
paint.setDistanceFieldTextTEMP(true);
#endif
sk_tool_utils::set_portable_typeface(&paint, "Times New Roman", SkTypeface::kNormal);
const char* text = "Hamburgefons";
const size_t textLen = strlen(text);
// check scaling up
SkScalar x = SkIntToScalar(0);
SkScalar y = SkIntToScalar(78);
for (size_t i = 0; i < SK_ARRAY_COUNT(textSizes); ++i) {
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(x, y);
canvas->scale(scales[i], scales[i]);
paint.setTextSize(textSizes[i]);
canvas->drawText(text, textLen, 0, 0, paint);
y += paint.getFontMetrics(NULL)*scales[i];
}
// check rotation
for (size_t i = 0; i < 5; ++i) {
SkScalar rotX = SkIntToScalar(10);
SkScalar rotY = y;
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(SkIntToScalar(10 + i * 200), -80);
rotate_about(canvas, SkIntToScalar(i * 5), rotX, rotY);
for (int ps = 6; ps <= 32; ps += 3) {
paint.setTextSize(SkIntToScalar(ps));
canvas->drawText(text, textLen, rotX, rotY, paint);
rotY += paint.getFontMetrics(NULL);
}
}
// check scaling down
paint.setLCDRenderText(true);
x = SkIntToScalar(680);
y = SkIntToScalar(20);
size_t arraySize = SK_ARRAY_COUNT(textSizes);
for (size_t i = 0; i < arraySize; ++i) {
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(x, y);
SkScalar scaleFactor = SkScalarInvert(scales[arraySize - i - 1]);
canvas->scale(scaleFactor, scaleFactor);
paint.setTextSize(textSizes[i]);
canvas->drawText(text, textLen, 0, 0, paint);
y += paint.getFontMetrics(NULL)*scaleFactor;
}
// check pos text
{
SkAutoCanvasRestore acr(canvas, true);
canvas->scale(2.0f, 2.0f);
SkAutoTArray<SkPoint> pos(textLen);
SkAutoTArray<SkScalar> widths(textLen);
paint.setTextSize(textSizes[0]);
paint.getTextWidths(text, textLen, &widths[0]);
SkScalar x = SkIntToScalar(340);
SkScalar y = SkIntToScalar(75);
for (unsigned int i = 0; i < textLen; ++i) {
pos[i].set(x, y);
x += widths[i];
}
canvas->drawPosText(text, textLen, &pos[0], paint);
}
// check gamma-corrected blending
const SkColor fg[] = {
0xFFFFFFFF,
0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF,
0xFFFF0000, 0xFF00FF00, 0xFF0000FF,
0xFF000000,
};
paint.setColor(0xFFF1F1F1);
SkRect r = SkRect::MakeLTRB(670, 250, 820, 460);
canvas->drawRect(r, paint);
x = SkIntToScalar(680);
y = SkIntToScalar(270);
paint.setTextSize(SkIntToScalar(22));
for (size_t i = 0; i < SK_ARRAY_COUNT(fg); ++i) {
paint.setColor(fg[i]);
canvas->drawText(text, textLen, x, y, paint);
y += paint.getFontMetrics(NULL);
}
paint.setColor(0xFF1F1F1F);
r = SkRect::MakeLTRB(820, 250, 970, 460);
canvas->drawRect(r, paint);
x = SkIntToScalar(830);
y = SkIntToScalar(270);
paint.setTextSize(SkIntToScalar(22));
for (size_t i = 0; i < SK_ARRAY_COUNT(fg); ++i) {
paint.setColor(fg[i]);
canvas->drawText(text, textLen, x, y, paint);
y += paint.getFontMetrics(NULL);
}
#if SK_SUPPORT_GPU
// render offscreen buffer
if (surface) {
SkImage* image = surface->newImageSnapshot();
image->draw(inputCanvas, 0, 0, NULL);
image->unref();
}
#endif
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new DFTextGM; }
static GMRegistry reg(MyFactory);
}
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