CGGradientRef Gradient::platformGradient()
{
if (m_gradient)
return m_gradient;
sortStopsIfNecessary();
const int cReservedStops = 3;
Vector<CGFloat, 4 * cReservedStops> colorComponents;
colorComponents.reserveInitialCapacity(m_stops.size() * 4); // RGBA components per stop
Vector<CGFloat, cReservedStops> locations;
locations.reserveInitialCapacity(m_stops.size());
for (size_t i = 0; i < m_stops.size(); ++i) {
colorComponents.uncheckedAppend(m_stops[i].red);
colorComponents.uncheckedAppend(m_stops[i].green);
colorComponents.uncheckedAppend(m_stops[i].blue);
colorComponents.uncheckedAppend(m_stops[i].alpha);
locations.uncheckedAppend(m_stops[i].stop);
}
m_gradient = CGGradientCreateWithColorComponents(deviceRGBColorSpaceRef(), colorComponents.data(), locations.data(), m_stops.size());
return m_gradient;
}
CGGradientRef Gradient::platformGradient()
{
if (m_gradient)
return m_gradient;
sortStopsIfNecessary();
// FIXME: ExtendedColor - we should generate CGColorRefs here, so that
// we can handle color spaces.
const int cReservedStops = 3;
Vector<CGFloat, 4 * cReservedStops> colorComponents;
colorComponents.reserveInitialCapacity(m_stops.size() * 4); // RGBA components per stop
Vector<CGFloat, cReservedStops> locations;
locations.reserveInitialCapacity(m_stops.size());
for (size_t i = 0; i < m_stops.size(); ++i) {
colorComponents.uncheckedAppend(m_stops[i].red);
colorComponents.uncheckedAppend(m_stops[i].green);
colorComponents.uncheckedAppend(m_stops[i].blue);
colorComponents.uncheckedAppend(m_stops[i].alpha);
locations.uncheckedAppend(m_stops[i].stop);
}
// FIXME: ExtendedColor - use CGGradientCreateWithColors so that we can have stops in different color spaces.
m_gradient = CGGradientCreateWithColorComponents(sRGBColorSpaceRef(), colorComponents.data(), locations.data(), m_stops.size());
return m_gradient;
}
void InitButton(unsigned w, unsigned h)
{
CGColorSpaceRef colorspace;
CGContextRef gc;
unsigned char *data;
float cx, cy;
data = (unsigned char *)malloc(w * h * 4);
colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
gc = CGBitmapContextCreate(data, w, h, 8, w * 4, colorspace,
kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
cx = CENTERX * w;
cy = CENTERY * h;
// background
CGContextTranslateCTM(gc, 0.0, h);
CGContextScaleCTM(gc, 1.0, -1.0);
CGContextClearRect(gc, CGRectMake(0, 0, w, h));
CGContextSetRGBFillColor(gc, 0.0, 0.0, 0.0, 0.8);
AddRoundedRectToPath(gc, CGRectMake(w*0.05, h*0.5 - 32, w*0.9, 64), 32, 32);
CGContextFillPath(gc);
CGGradientRef gradient;
size_t num_locations = 2;
CGFloat locations[2] = { 0.0, 1.0 };
CGFloat components[8] = { 1.0, 1.0, 1.0, 0.5, // Start color
0.0, 0.0, 0.0, 0.0
}; // End color
gradient = CGGradientCreateWithColorComponents (colorspace, components,
locations, num_locations);
// top bevel
CGContextSaveGState(gc);
AddRoundedRectToPath(gc, CGRectMake(w*0.05, h*0.5 - 32, w*0.9, 64), 32, 32);
CGContextEOClip(gc);
CGContextDrawLinearGradient (gc, gradient,
CGPointMake(cx, cy + 32),
CGPointMake(cx, cy), 0);
CGContextDrawLinearGradient (gc, gradient,
CGPointMake(cx, cy - 32),
CGPointMake(cx, cy - 16), 0);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, data);
CGContextRelease(gc);
CGColorSpaceRelease(colorspace);
free(data);
}
static void initNeedle(unsigned w, unsigned h, unsigned max)
{
CGColorSpaceRef colorspace;
CGContextRef gc;
unsigned char *data;
float cx, cy;
float angle, radius, needle;
data = (unsigned char *)malloc(w * h * 4);
colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
gc = CGBitmapContextCreate(data, w, h, 8, w * 4, colorspace,
kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
cx = CENTERX * w;
cy = CENTERY * h;
radius = 0.5 * (w > h ? w : h);
needle = radius * 0.85;
CGContextTranslateCTM(gc, 0.0, h);
CGContextScaleCTM(gc, 1.0, -1.0);
CGContextClearRect(gc, CGRectMake(0, 0, w, h));
angle = 0;//angleForValue(0, max);
{
// draw glow reflecting on inner bevel
float dx, dy;
dx = -cos(angle) + 1;
dy = -sin(angle) + 1;
CGGradientRef gradient;
size_t num_locations = 2;
CGFloat locations[2] = { 0.0, 1.0 };
CGFloat components[8] = { 0.7, 0.7, 1.0, 0.7, // Start color
0.0, 0.0, 0.0, 0.0
}; // End color
gradient = CGGradientCreateWithColorComponents (colorspace, components,
locations, num_locations);
CGContextSaveGState(gc);
CGContextAddArc(gc, cx, cy, needle*1.05, 0, 2*M_PI, false);
CGContextAddArc(gc, cx, cy, needle*0.96, 0, 2*M_PI, false);
CGContextEOClip(gc);
CGContextDrawRadialGradient (gc, gradient,
CGPointMake(cx*dx, cy*dy), radius*0.1,
CGPointMake(cx*1.0, cy*1.0), radius*1.0, 0);
CGContextRestoreGState(gc);
}
CGContextSetRGBFillColor(gc, 0.9, 0.9, 1.0, 1.0);
// draw several glow passes, with the content offscreen
CGContextTranslateCTM(gc, 0, OFFSCREEN - 10);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawNeedle(gc, w, h, angle);
CGContextTranslateCTM(gc, 0, 20);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawNeedle(gc, w, h, angle);
CGContextTranslateCTM(gc, -10, -10);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawNeedle(gc, w, h, angle);
CGContextTranslateCTM(gc, 20, 0);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawNeedle(gc, w, h, angle);
CGContextTranslateCTM(gc, -10, -OFFSCREEN);
// draw real content
CGContextSetShadowWithColor(gc, CGSizeMake(0, 1), 6.0, CGColorCreateGenericRGB(0.0, 0.0, 0.5, 0.7));
drawNeedle(gc, w, h, angle);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, data);
CGContextRelease(gc);
CGColorSpaceRelease(colorspace);
free(data);
}
static void initBackground(unsigned w, unsigned h, unsigned max)
{
CGColorSpaceRef colorspace;
CGContextRef gc;
unsigned char *data;
float cx, cy;
float radius, needle;
data = (unsigned char *)malloc(w * h * 4);
colorspace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
gc = CGBitmapContextCreate(data, w, h, 8, w * 4, colorspace,
kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
cx = CENTERX * w;
cy = CENTERY * h;
radius = 0.5 * (w > h ? w : h);
needle = radius * 0.85;
// background
CGContextTranslateCTM(gc, 0.0, h);
CGContextScaleCTM(gc, 1.0, -1.0);
CGContextClearRect(gc, CGRectMake(0, 0, w, h));
CGContextSetRGBFillColor(gc, 0.0, 0.0, 0.0, 0.7);
CGContextAddArc(gc, cx, cy, radius, 0, 2*M_PI, false);
CGContextFillPath(gc);
CGGradientRef gradient;
size_t num_locations = 2;
CGFloat locations[2] = { 0.0, 1.0 };
CGFloat components[8] = { 1.0, 1.0, 1.0, 0.5, // Start color
0.0, 0.0, 0.0, 0.0
}; // End color
gradient = CGGradientCreateWithColorComponents (colorspace, components,
locations, num_locations);
// top rim light
CGContextSaveGState(gc);
CGContextAddArc(gc, cx, cy, radius, 0, 2*M_PI, false);
CGContextAddArc(gc, cx, cy, needle*1.05, 0, 2*M_PI, false);
CGContextEOClip(gc);
CGContextDrawRadialGradient (gc, gradient,
CGPointMake(cx, cy*1.00), radius*1.01,
CGPointMake(cx, cy*0.96), radius*0.98, 0);
// bottom rim light
CGContextDrawRadialGradient (gc, gradient,
CGPointMake(cx, cy*1.00), radius*1.01,
CGPointMake(cx, cy*1.04), radius*0.98, 0);
// top bevel
CGContextDrawRadialGradient (gc, gradient,
CGPointMake(cx, cy*2.2), radius*0.2,
CGPointMake(cx, cy*1.0), radius*1.0, 0);
// bottom bevel
CGContextRestoreGState(gc);
CGContextSaveGState(gc);
CGContextAddArc(gc, cx, cy, needle*1.05, 0, 2*M_PI, false);
CGContextAddArc(gc, cx, cy, needle*0.96, 0, 2*M_PI, false);
CGContextEOClip(gc);
CGContextDrawRadialGradient (gc, gradient,
CGPointMake(cx, cy* -.5), radius*0.2,
CGPointMake(cx, cy*1.0), radius*1.0, 0);
CGGradientRelease(gradient);
CGContextRestoreGState(gc);
CGContextSetRGBFillColor(gc, 0.9, 0.9, 1.0, 1.0);
CGContextSetRGBStrokeColor(gc, 0.9, 0.9, 1.0, 1.0);
CGContextSetLineCap(gc, kCGLineCapRound);
// draw several glow passes, with the content offscreen
CGContextTranslateCTM(gc, 0, OFFSCREEN - 10);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawMarks(gc, w, h, max);
CGContextTranslateCTM(gc, 0, 20);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawMarks(gc, w, h, max);
CGContextTranslateCTM(gc, -10, -10);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawMarks(gc, w, h, max);
CGContextTranslateCTM(gc, 20, 0);
CGContextSetShadowWithColor(gc, CGSizeMake(0, OFFSCREEN), 48.0, CGColorCreateGenericRGB(0.5, 0.5, 1.0, 0.7));
drawMarks(gc, w, h, max);
CGContextTranslateCTM(gc, -10, -OFFSCREEN);
// draw real content
CGContextSetShadowWithColor(gc, CGSizeMake(0, 1), 6.0, CGColorCreateGenericRGB(0.7, 0.7, 1.0, 0.9));
drawMarks(gc, w, h, max);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, data);
CGContextRelease(gc);
CGColorSpaceRelease(colorspace);
free(data);
}
