thorvg/src/lib/sw_engine/tvgSwRenderer.cpp
Hermet Park 4d72eeda15 sw_engine: revise scale transform logic.
Basically, stroke width size is linear,

engine couldn't apply scale factor from the matrix which contains 2 dimensional values.

Thus, we can apply it if the scale factor of x/y is identical.

Otherwise, we should transform every stroke points in the stroking process.
That scenario can be improved with another patch.

Change-Id: I070dcf29d2e42f21e182bdf4239781464158ef73
2020-07-22 20:59:52 +09:00

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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef _TVG_SW_RENDERER_CPP_
#define _TVG_SW_RENDERER_CPP_
using namespace std;
#include "tvgSwCommon.h"
#include "tvgSwRenderer.h"
/************************************************************************/
/* Internal Class Implementation */
/************************************************************************/
namespace tvg {
struct SwTask
{
SwShape shape;
const Shape* sdata;
SwSize clip;
Matrix* transform;
RenderUpdateFlag flags;
future<void> progress;
};
}
static RenderInitializer renderInit;
/************************************************************************/
/* External Class Implementation */
/************************************************************************/
SwRenderer::~SwRenderer()
{
flush();
}
bool SwRenderer::clear()
{
return flush();
}
bool SwRenderer::target(uint32_t* buffer, uint32_t stride, uint32_t w, uint32_t h)
{
if (!buffer || stride == 0 || w == 0 || h == 0) return false;
surface.buffer = buffer;
surface.stride = stride;
surface.w = w;
surface.h = h;
return true;
}
bool SwRenderer::preRender()
{
//before we start rendering, we should finish all preparing tasks
while (prepareTasks.size() > 0) {
auto task = prepareTasks.front();
if (task->progress.valid()) task->progress.get();
prepareTasks.pop();
renderTasks.push(task);
}
return true;
}
bool SwRenderer::postRender()
{
auto asyncTask = [](SwRenderer* renderer) {
renderer->doRender();
};
progress = async(launch::async, asyncTask, this);
return true;
}
void SwRenderer::doRender()
{
rasterClear(surface);
while (renderTasks.size() > 0) {
auto task = renderTasks.front();
uint8_t r, g, b, a;
if (auto fill = task->sdata->fill()) {
rasterGradientShape(surface, task->shape, fill->id());
} else{
task->sdata->fill(&r, &g, &b, &a);
if (a > 0) rasterSolidShape(surface, task->shape, r, g, b, a);
}
task->sdata->strokeColor(&r, &g, &b, &a);
if (a > 0) rasterStroke(surface, task->shape, r, g, b, a);
renderTasks.pop();
}
}
bool SwRenderer::flush()
{
while (prepareTasks.size() > 0) {
auto task = prepareTasks.front();
if (task->progress.valid()) task->progress.get();
prepareTasks.pop();
}
if (progress.valid()) progress.get();
return true;
}
bool SwRenderer::render(const Shape& sdata, void *data)
{
//Do Nothing
return true;
}
bool SwRenderer::dispose(const Shape& sdata, void *data)
{
auto task = static_cast<SwTask*>(data);
if (!task) return true;
if (task->progress.valid()) task->progress.get();
shapeFree(task->shape);
if (task->transform) free(task->transform);
free(task);
return true;
}
void* SwRenderer::prepare(const Shape& sdata, void* data, const RenderTransform* transform, RenderUpdateFlag flags)
{
//prepare task
auto task = static_cast<SwTask*>(data);
if (!task) {
task = static_cast<SwTask*>(calloc(1, sizeof(SwTask)));
if (!task) return nullptr;
}
if (flags == RenderUpdateFlag::None || task->progress.valid()) return task;
task->sdata = &sdata;
task->clip = {static_cast<SwCoord>(surface.w), static_cast<SwCoord>(surface.h)};
if (transform) {
if (!task->transform) task->transform = static_cast<Matrix*>(malloc(sizeof(Matrix)));
assert(task->transform);
*task->transform = transform->m;
} else {
if (task->transform) free(task->transform);
task->transform = nullptr;
}
task->flags = flags;
auto asyncTask = [](SwTask* task) {
//Valid Stroking?
uint8_t strokeAlpha = 0;
auto strokeWidth = task->sdata->strokeWidth();
if (strokeWidth > FLT_EPSILON) {
task->sdata->strokeColor(nullptr, nullptr, nullptr, &strokeAlpha);
}
//Shape
if (task->flags & (RenderUpdateFlag::Path | RenderUpdateFlag::Transform)) {
shapeReset(task->shape);
uint8_t alpha = 0;
task->sdata->fill(nullptr, nullptr, nullptr, &alpha);
bool renderShape = (alpha > 0 || task->sdata->fill());
if (renderShape || strokeAlpha) {
if (!shapePrepare(task->shape, task->sdata, task->clip, task->transform)) return;
if (renderShape) {
auto antiAlias = (strokeAlpha > 0 && strokeWidth >= 2) ? false : true;
if (!shapeGenRle(task->shape, task->sdata, task->clip, antiAlias)) return;
}
}
}
//Fill
if (task->flags & (RenderUpdateFlag::Gradient | RenderUpdateFlag::Transform)) {
auto fill = task->sdata->fill();
if (fill) {
auto ctable = (task->flags & RenderUpdateFlag::Gradient) ? true : false;
if (ctable) shapeResetFill(task->shape);
if (!shapeGenFillColors(task->shape, fill, task->transform, ctable)) return;
} else {
shapeDelFill(task->shape);
}
}
//Stroke
if (task->flags & (RenderUpdateFlag::Stroke | RenderUpdateFlag::Transform)) {
if (strokeAlpha > 0) {
shapeResetStroke(task->shape, task->sdata, task->transform);
if (!shapeGenStrokeRle(task->shape, task->sdata, task->transform, task->clip)) return;
} else {
shapeDelStroke(task->shape);
}
}
shapeDelOutline(task->shape);
};
prepareTasks.push(task);
task->progress = async((launch::async | launch::deferred), asyncTask, task);
return task;
}
int SwRenderer::init()
{
return RenderInitializer::init(renderInit, new SwRenderer);
}
int SwRenderer::term()
{
return RenderInitializer::term(renderInit);
}
uint32_t SwRenderer::unref()
{
return RenderInitializer::unref(renderInit);
}
uint32_t SwRenderer::ref()
{
return RenderInitializer::ref(renderInit);
}
SwRenderer* SwRenderer::inst()
{
//We know renderer type, avoid dynamic_cast for performance.
return static_cast<SwRenderer*>(RenderInitializer::inst(renderInit));
}
#endif /* _TVG_SW_RENDERER_CPP_ */