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GradientStopsNVpr.cpp
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GradientStopsNVpr.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GradientStopsNVpr.h"
#include <deque>
#include <vector>
static const int sMaxColorRampSize = 4096;
static const size_t sMaxRampTexturePoolSize = 32;
using namespace mozilla::gfx::nvpr;
using namespace std;
struct TextureColor {
TextureColor() {}
TextureColor(const mozilla::gfx::Color& color)
: r(static_cast<GLubyte>(color.a * color.r * 255))
, g(static_cast<GLubyte>(color.a * color.g * 255))
, b(static_cast<GLubyte>(color.a * color.b * 255))
, a(static_cast<GLubyte>(color.a * 255))
{}
void Lerp(TextureColor aColor1, TextureColor aColor2, uint8_t aWeight)
{
r = (aColor1.r * (256 - aWeight) + aColor2.r * aWeight) >> 8;
g = (aColor1.g * (256 - aWeight) + aColor2.g * aWeight) >> 8;
b = (aColor1.b * (256 - aWeight) + aColor2.b * aWeight) >> 8;
a = (aColor1.a * (256 - aWeight) + aColor2.a * aWeight) >> 8;
}
void Average(TextureColor aColor1, TextureColor aColor2)
{
r = (aColor1.r + aColor2.r) >> 1;
g = (aColor1.g + aColor2.g) >> 1;
b = (aColor1.b + aColor2.b) >> 1;
a = (aColor1.a + aColor2.a) >> 1;
}
GLubyte r, g, b, a;
};
struct ColorRampData : public mozilla::gfx::nvpr::UserData::Object {
vector<TextureColor> mRampBuffer;
size_t mNumLevels;
deque<GLuint> mTexturePool;
};
namespace mozilla {
namespace gfx {
GradientStopsNVpr::GradientStopsNVpr(GradientStop* aRawStops, uint32_t aNumStops,
ExtendMode aExtendMode)
: mRampTextureId(0)
, mInitialColor(1, 1, 1, 1)
, mFinalColor(1, 1, 1, 1)
{
if (!aRawStops || !aNumStops) {
return;
}
if (aNumStops == 1) {
mInitialColor = mFinalColor = aRawStops[0].color;
return;
}
vector<GradientStop> sortedStops(aNumStops);
memcpy(sortedStops.data(), aRawStops, aNumStops * sizeof(GradientStop));
sort(sortedStops.begin(), sortedStops.end());
mInitialColor = sortedStops.front().color;
mFinalColor = sortedStops.back().color;
gl->MakeCurrent();
// Draw the color stops into a linear color ramp buffer.
// TODO: Optimize this with SSE/NEON.
ColorRampData& rampData =
gl->GetUserObject<ColorRampData>(&nvpr::UserData::mColorRampData);
vector<TextureColor>& ramp = rampData.mRampBuffer;
if (ramp.empty()) {
ramp.resize(min(sMaxColorRampSize, gl->MaxTextureSize()));
rampData.mNumLevels = 0;
for (size_t width = ramp.size(); width; width >>= 1) {
rampData.mNumLevels++;
}
}
TextureColor startColor(mInitialColor);
MOZ_ASSERT(sortedStops[0].offset >= 0 && sortedStops[0].offset <= 1);
size_t startIndex = sortedStops[0].offset * (ramp.size() - 1);
for (size_t i = 0; i < startIndex; i++) {
ramp[i] = startColor;
}
for (size_t i = 1; i < sortedStops.size(); i++) {
MOZ_ASSERT(sortedStops[i].offset >= 0 && sortedStops[i].offset <= 1);
const TextureColor endColor(sortedStops[i].color);
const size_t endIndex = sortedStops[i].offset * (ramp.size() - 1);
if (endIndex == startIndex) {
startColor = endColor;
continue;
}
const uint16_t weightStep = (1 << 16) / (endIndex - startIndex);
uint16_t weight = 0;
for (size_t i = startIndex; i < endIndex; i++) {
ramp[i].Lerp(startColor, endColor, weight >> 8);
weight += weightStep;
}
startColor = endColor;
startIndex = endIndex;
}
const TextureColor endColor(mFinalColor);
for (size_t i = startIndex; i < ramp.size(); i++) {
ramp[i] = endColor;
}
// Create a texture from the color ramp buffer.
if (!rampData.mTexturePool.empty()) {
mRampTextureId = rampData.mTexturePool.front();
rampData.mTexturePool.pop_front();
} else {
gl->GenTextures(1, &mRampTextureId);
gl->TextureStorage1DEXT(mRampTextureId, GL_TEXTURE_1D,
rampData.mNumLevels, GL_RGBA8, ramp.size());
}
gl->TextureSubImage1DEXT(mRampTextureId, GL_TEXTURE_1D, 0, 0, ramp.size(),
GL_RGBA, GL_UNSIGNED_BYTE, ramp.data());
size_t previousWidth = ramp.size();
for (size_t level = 1; level < rampData.mNumLevels - 1; level++) {
// Generate a mipmap image where the begin and end texels are the same
// colors as the begin and end stops, to ensure proper clamping.
const size_t width = previousWidth >> 1;
for (size_t i = 1; i < width - 1; i++) {
ramp[i].Average(ramp[2 * i], ramp[2 * i + 1]);
}
ramp[width - 1] = ramp[previousWidth - 1];
gl->TextureSubImage1DEXT(mRampTextureId, GL_TEXTURE_1D, level, 0, width,
GL_RGBA, GL_UNSIGNED_BYTE, ramp.data());
previousWidth = width;
}
// Configure texturing parameters.
gl->TextureParameteriEXT(mRampTextureId, GL_TEXTURE_1D,
//GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl->TextureParameteriEXT(mRampTextureId, GL_TEXTURE_1D,
GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if (aExtendMode == ExtendMode::CLAMP) {
gl->TextureParameteriEXT(mRampTextureId, GL_TEXTURE_1D, GL_TEXTURE_MAX_LEVEL,
rampData.mNumLevels - 2);
} else {
gl->TextureParameteriEXT(mRampTextureId, GL_TEXTURE_1D, GL_TEXTURE_MAX_LEVEL,
rampData.mNumLevels - 1);
ramp[0].Average(ramp[0], ramp[1]);
gl->TextureSubImage1DEXT(mRampTextureId, GL_TEXTURE_1D,
rampData.mNumLevels - 1, 0, 1, GL_RGBA,
GL_UNSIGNED_BYTE, ramp.data());
}
GLenum wrapMode;
switch (aExtendMode) {
default:
MOZ_ASSERT(!"Invalid gradient extend mode");
case ExtendMode::CLAMP:
wrapMode = GL_CLAMP_TO_EDGE;
break;
case ExtendMode::REPEAT:
wrapMode = GL_REPEAT;
break;
case ExtendMode::REFLECT:
wrapMode = GL_MIRRORED_REPEAT;
break;
}
gl->TextureParameteriEXT(mRampTextureId, GL_TEXTURE_1D,
GL_TEXTURE_WRAP_S, wrapMode);
}
GradientStopsNVpr::~GradientStopsNVpr()
{
ColorRampData& rampData =
gl->GetUserObject<ColorRampData>(&nvpr::UserData::mColorRampData);
if (rampData.mTexturePool.size() < sMaxRampTexturePoolSize) {
rampData.mTexturePool.push_back(mRampTextureId);
return;
}
gl->MakeCurrent();
gl->DeleteTexture(mRampTextureId);
}
}
}