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darling-cocotron/O2Context_AntiGrain/O2Context_AntiGrain.mm

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#import "O2Context_AntiGrain.h"
#import <Onyx2D/O2Surface.h>
#import <Onyx2D/O2GraphicsState.h>
#import <Onyx2D/O2ClipState.h>
#import <Onyx2D/O2ClipPhase.h>
#import <Onyx2D/O2MutablePath.h>
#ifdef ANTIGRAIN_PRESENT
#include <agg_color_rgba.h>
#include <agg_span_gradient.h>
#include <agg_span_interpolator_linear.h>
#include <agg_span_allocator.h>
#include <agg_span_converter.h>
#include <agg_image_accessors.h>
#include <agg_span_image_filter_rgba.h>
#include <agg_span_image_filter_rgb.h>
#include <agg_conv_dash.h>
#include "partial_stack_blur.h"
#ifdef WINDOWS
#include <AppKit/KTFont.h>
static inline void getcpuid(int info_type, int info[4]) {
asm volatile (
"pushl %%ebx \n\t"
"cpuid \n\t"
"movl %%ebx, %1 \n\t"
"popl %%ebx \n\t"
: "=a"(info[0]), "=r"(info[1]), "=c"(info[2]), "=d"(info[3])
: "a"(info_type)
);
}
static inline bool cpuHasSSE2()
{
int cpu_info[4] = { 0 };
getcpuid(1, cpu_info);
return (cpu_info[3] & (1<<26)) != 0;
}
#else
static inline bool cpuHasSSE2
{
return false;
}
#endif
#include <agg_pixfmt_rgba.h>
#include "o2agg_span_image_filter_rgba.h"
typedef enum {
kImageInterpolationNone,
kImageInterpolationBilinear,
kImageInterpolationBicubic,
kImageInterpolationLanczos,
kImageInterpolationRepeat,
} ImageInterpolationType;
//#define DEBUG
static const int kKFontCacheSize = 100;
static inline float fract(float f)
{
return f - truncf(f);
}
#ifdef O2AGG_GLYPH_SUPPORT
// They are shared by all the contexts
static font_engine_type *font_engine = 0;
static font_manager_type *font_manager = 0;
#endif
// Like NSLog, but works in C++ code - format is a C strings (""), not a Obj-C string (@"")
#ifdef DEBUG
static void O2Log(const char *format,...)
{
va_list ap;
va_start(ap, format); //Requires the last fixed parameter (to get the address)
NSString *f = [NSString stringWithUTF8String:format];
NSLogv(f, ap);
va_end(ap);
}
#else
static void O2Log(const char *format,...)
{
}
#endif
// Multiply the alpha spans with a ratio - used as a transformer to render alpha for non-plain color
typedef agg::scanline_u8_am<MaskType> scanline_mask_type;
// render_scanlines_aa_solid with some added translation parameter - we've just added the "+dx, +dy" part
template<class Rasterizer, class Scanline,
class BaseRenderer, class ColorT>
void render_scanlines_aa_solid_translate(Rasterizer& ras, Scanline& sl,
BaseRenderer& ren, const ColorT& color, int dx, int dy)
{
if(ras.rewind_scanlines())
{
// Explicitly convert "color" to the BaseRenderer color type.
// For example, it can be called with color type "rgba", while
// "rgba8" is needed. Otherwise it will be implicitly
// converted in the loop many times.
//----------------------
typename BaseRenderer::color_type ren_color(color);
sl.reset(ras.min_x(), ras.max_x());
while(ras.sweep_scanline(sl))
{
//render_scanline_aa_solid(sl, ren, ren_color);
//
// This code is equivalent to the above call (copy/paste).
// It's just a "manual" optimization for old compilers,
// like Microsoft Visual C++ v6.0
//-------------------------------
int y = sl.y();
unsigned num_spans = sl.num_spans();
typename Scanline::const_iterator span = sl.begin();
for(;;)
{
int x = span->x;
if(span->len > 0)
{
ren.blend_solid_hspan(x+dx, y+dy, (unsigned)span->len,
ren_color,
span->covers);
}
else
{
ren.blend_hline(x+dx, y+dy, (unsigned)(x - span->len - 1),
ren_color,
*(span->covers));
}
if(--num_spans == 0) break;
++span;
}
}
}
}
// render_scanlines_aa with some added translation parameter - we've just added the "+dx, +dy" part
template<class Scanline, class BaseRenderer,
class SpanAllocator, class SpanGenerator>
void render_scanline_aa_translate(const Scanline& sl, BaseRenderer& ren,
SpanAllocator& alloc, SpanGenerator& span_gen, int dx, int dy)
{
int y = sl.y();
unsigned num_spans = sl.num_spans();
typename Scanline::const_iterator span = sl.begin();
for(;;)
{
int x = span->x;
int len = span->len;
const typename Scanline::cover_type* covers = span->covers;
if(len < 0) len = -len;
typename BaseRenderer::color_type* colors = alloc.allocate(len);
span_gen.generate(colors, x, y, len);
ren.blend_color_hspan(x + dx, y + dy, len, colors,
(span->len < 0) ? 0 : covers, *covers);
if(--num_spans == 0) break;
++span;
}
}
// render_scanlines_aa with some added translation parameter
template<class Rasterizer, class Scanline, class BaseRenderer,
class SpanAllocator, class SpanGenerator>
void render_scanlines_aa_translate(Rasterizer& ras, Scanline& sl, BaseRenderer& ren,
SpanAllocator& alloc, SpanGenerator& span_gen, int dx, int dy)
{
if(ras.rewind_scanlines())
{
sl.reset(ras.min_x(), ras.max_x());
span_gen.prepare();
while(ras.sweep_scanline(sl))
{
render_scanline_aa_translate(sl, ren, alloc, span_gen, dx, dy);
}
}
}
// Apply some alpha value to its input spans
template<class color_type> struct span_alpha_converter
{
span_alpha_converter(float alpha, bool premultiply) : m_alpha(alpha), m_premultiply(premultiply) {};
void prepare() {}
inline void generate(color_type* span, int x, int y, unsigned len)
{
if(m_alpha < 1.) {
if (m_premultiply) {
do {
span->demultiply();
span->opacity(span->opacity()*m_alpha);
span->premultiply();
++span;
} while(--len);
} else {
do {
span->opacity(span->opacity()*m_alpha);
++span;
} while(--len);
}
}
}
private:
bool m_premultiply;
double m_alpha;
};
// Replace spans with a fixed color, keeping the original opacity - used as a transformer to render shadow with no blur, for non-plain color
class span_color_converter
{
public:
span_color_converter(o2agg::rgba8 &color, bool premultiply) : m_color(color), m_premultiply(premultiply) {};
void prepare() {}
inline void generate(o2agg::rgba8* span, int x, int y, unsigned len)
{
if (m_premultiply) {
do {
// Replace the span color, with m_color * span opacity
if (span->opacity() > 0) {
o2agg::rgba8 color = m_color;
color.opacity(color.opacity()*span->opacity());
color.premultiply();
*span = color;
}
++span;
} while(--len);
} else {
do {
// Replace the span color, with m_color * span opacity
if (span->opacity() > 0) {
o2agg::rgba8 color = m_color;
color.opacity(color.opacity()*span->opacity());
*span = color;
}
++span;
} while(--len);
}
}
private:
bool m_premultiply;
o2agg::rgba8 m_color;
};
class context_renderer
{
class context_renderer_helper_base
{
protected:
bool premultiply;
public:
virtual ~context_renderer_helper_base() { };
void setPremultiply(bool pre) { premultiply = pre; };
virtual bool isRGBA() { return false; }
virtual bool isBGRA() { return false; }
virtual bool isARGB() { return false; }
virtual bool isABGR() { return false; }
virtual void setBlendMode(int blendMode) = 0;
virtual void setAlpha(float alpha) = 0;
virtual void setShadowColor(o2agg::rgba color) = 0;
virtual void setShadowBlurRadius(float radius) = 0;
virtual void setShadowOffset(O2Size offset) = 0;
virtual void clipBox(int a, int b, int c, int d) = 0;
};
template<class blender_type> class context_renderer_helper : public context_renderer_helper_base
{
typedef o2agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixfmt_type;
typedef o2agg::pixfmt_bgra32_pre pixfmt_shadow_type;
typedef agg::renderer_base<pixfmt_type> renderer_base;
typedef agg::renderer_base<pixfmt_shadow_type> renderer_shadow;
renderer_base *ren_base;
pixfmt_type *pixelFormat;
// Rendering buffer to use for shadow rendering
uint8_t *pixelShadowBytes;
agg::rendering_buffer *renderingBufferShadow;
renderer_shadow *ren_shadow;
pixfmt_shadow_type *pixelFormatShadow;
float alpha;
o2agg::rgba shadowColor;
O2Size shadowOffset;
float shadowBlurRadius;
public:
context_renderer *renderer;
context_renderer_helper(agg::rendering_buffer &renderingBuffer)
{
pixelFormat=new pixfmt_type(renderingBuffer);
ren_base=new renderer_base(*pixelFormat);
pixelShadowBytes = NULL;
renderingBufferShadow = NULL;
ren_shadow = NULL;
pixelFormatShadow = NULL;
shadowColor = o2agg::rgba(0, 0, 0, 0);
alpha = 1.;
}
virtual ~context_renderer_helper()
{
delete pixelFormat;
delete ren_base;
if (ren_shadow) {
delete ren_shadow;
delete pixelFormatShadow;
delete renderingBufferShadow;
delete[] pixelShadowBytes;
}
}
void setBlendMode(int blendMode)
{
pixelFormat->comp_op(blendMode);
}
void setAlpha(float a)
{
alpha = a;
}
void setShadowColor(o2agg::rgba color)
{
shadowColor = color;
}
void setShadowBlurRadius(float radius)
{
shadowBlurRadius = radius;
}
void setShadowOffset(O2Size offset)
{
shadowOffset = offset;
}
void setUpShadow()
{
if (ren_shadow == NULL) {
// Use rgba32
int height = ren_base->ren().height();
int width = ren_base->ren().width();
int bytesPerRow = ren_base->ren().stride();
pixelShadowBytes = new uint8_t[height*bytesPerRow];
renderingBufferShadow = new agg::rendering_buffer(pixelShadowBytes,width,height,bytesPerRow);
pixelFormatShadow=new pixfmt_shadow_type(*renderingBufferShadow);
ren_shadow=new renderer_shadow(*pixelFormatShadow);
}
ren_shadow->reset_clipping(1);
ren_shadow->clip_box(ren_base->xmin(), ren_base->ymin(), ren_base->xmax(), ren_base->ymax());
}
void clipBox(int a, int b, int c, int d)
{
ren_base->reset_clipping(1);
ren_base->clip_box(a, b, c, d);
}
// Blur the (x1,y1,x2,y2) part of the shadow buffer, and copy it to the main buffer
template<class Ras, class S> void blur(S &sl, float x1, float x2, float y1, float y2)
{
float xmin = ren_base->xmin();
float ymin = ren_base->ymin();
float xmax = ren_base->xmax();
float ymax = ren_base->ymax();
if (xmax <= xmin || ymax <= ymin) {
O2Log("Nothing to do - skip shadow blur");
return;
}
// Clip the rect to render - no need to try to blur any clipped area
xmin = max(xmin, x1);
xmax = min(xmax, x2);
ymin = max(ymin, y1);
ymax = min(ymax, y2);
xmin = floorf(xmin);
ymin = floorf(ymin);
xmax = ceilf(xmax);
ymax = ceilf(ymax);
// Blur the shadows
int radius = agg::iround(shadowBlurRadius);
if (radius > 0) {
// Add the blur radius to the area to blur
xmin -= radius;
xmax += radius;
ymin -= radius;
ymax += radius;
xmin = max(xmin,0);
ymin = max(ymin,0);
O2Log("Shadow: blur shadow - area : ((%.0f,%.0f),(%.0f,%.0f))", xmin, ymin, xmax - xmin, ymax - ymin);
// Stack blur - not really a gaussian one but much faster and good enough
// Blur only the current clipped area - no need to process pixels we won't see
if (xmax > xmin && ymax > ymin) {
float r = shadowColor.r;
float g = shadowColor.g;
float b = shadowColor.b;
// This is bluring the alpha channel and fill pixels with (r,g,b) premultiplied by the blured alpha * the passed alpha parameter
partial_stack_blur_rgba32(*pixelFormatShadow, radius, xmin, xmax, ymin, ymax, r, g, b, shadowColor.a * alpha);
} else {
O2Log("Skip blurring");
}
O2Log("Shadow: done blur");
}
// Add the offset to the area to copy - the translated drawing only take the rounded translation into account
// So add the fractionary part
Ras r;
xmin += fract(shadowOffset.width);
xmax += fract(shadowOffset.width);
ymin -= fract(shadowOffset.height);
ymax -= fract(shadowOffset.height);
xmin = max(xmin,0);
ymin = max(ymin,0);
xmin = floorf(xmin);
ymin = floorf(ymin);
xmax = ceilf(xmax);
ymax = ceilf(ymax);
if (xmax <= xmin || ymax <= ymin) {
O2Log("Nothing to do - skip shadow drawing");
return;
}
r.clip_box(ren_base->xmin(), ren_base->ymin(), ren_base->xmax(), ren_base->ymax());
// Rasterize the shadow to our main renderer
agg::path_storage aggPath;
O2Log("Shadow: copying to area : ((%.0f,%.0f),(%.0f,%.0f))", xmin, ymin, xmax - xmin, ymax - ymin);
// We'll use a path that cover the current used rect, and render that path using the shadow image
aggPath.move_to(xmin, ymin);
aggPath.line_to(xmax, ymin);
aggPath.line_to(xmax, ymax);
aggPath.line_to(xmin, ymax);
aggPath.end_poly();
agg::conv_curve<agg::path_storage> curve(aggPath);
r.add_path(curve);
agg::span_allocator<typename pixfmt_shadow_type::color_type> sa;
typedef agg::image_accessor_clone<pixfmt_shadow_type> img_accessor_type;
typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
img_accessor_type ia(*pixelFormatShadow);
agg::trans_affine transform;
transform.translate(-fract(shadowOffset.width), fract(shadowOffset.height)); // Translate using the fract part of the shadow offset
interpolator_type interpolator(transform);
typedef agg::span_image_filter_rgba_nn<img_accessor_type, interpolator_type> span_gen_type;
span_gen_type sg(ia, interpolator);
unsigned oldBlendMode = pixelFormat->comp_op();
pixelFormat->comp_op(o2agg::comp_op_src_over); // Always use src_over when copying the shadow
agg::render_scanlines_aa(r, sl, *ren_base, sa, sg);
pixelFormat->comp_op(oldBlendMode);
}
template<class Ras, class S, class T> void render_scanlines(Ras &rasterizer, S &sl, T &type)
{
agg::render_scanlines(rasterizer, sl, type);
}
// Used to render images & shadings
template<class Ras, class S, class SA, class T> void render_scanlines_aa(Ras &rasterizer, S &sl, SA &span_allocator, T &type)
{
O2Log("%p:Drawing Image", this);
if (shadowColor.a > 0.) {
setUpShadow();
O2Log("%p:Drawing shadow Image", this);
// Clear the shadow buffer
int x = ren_base->xmin();
int y = ren_base->ymin();
int xmax = ren_base->xmax();
int ymax = ren_base->ymax();
ren_shadow->reset_clipping(true);
ren_shadow->copy_bar(x-shadowBlurRadius, y-shadowBlurRadius, xmax+shadowBlurRadius, ymax+shadowBlurRadius, o2agg::rgba::no_color());
ren_shadow->clip_box(ren_base->xmin(), ren_base->ymin(), ren_base->xmax(), ren_base->ymax());
// Draw to our shadow buffer
if (shadowBlurRadius == 0) {
// All colors are being transformed to the shadow one since we can skip the blur pass which is also applying the color
o2agg::rgba8 color = o2agg::rgba(shadowColor.r, shadowColor.g, shadowColor.b, shadowColor.a * alpha);
span_color_converter color_converter(color, premultiply);
agg::span_converter<T, span_color_converter > converter(type, color_converter);
// Render to the shadow location (rounded - we are working with pixels here) so we're sure we can properly blur the shadow
// We'll take into account the fractional part when copying the shadow to the final buffer
render_scanlines_aa_translate(rasterizer, sl, *ren_shadow, span_allocator, converter, truncf(shadowOffset.width), -truncf(shadowOffset.height));
} else {
// The bluring will actually apply the right shadow color - no need to do any transform here
render_scanlines_aa_translate(rasterizer, sl, *ren_shadow, span_allocator, type, truncf(shadowOffset.width), -truncf(shadowOffset.height));
}
// Blur the shadow buffer and copy it back
// Get the used part of the rasterizer - we don't need to blur a bigger area than that
float x1 = rasterizer.min_x();
float x2 = rasterizer.max_x();
float y1 = rasterizer.min_y();
float y2 = rasterizer.max_y();
// Add the translation done during the rendering
x1 += truncf(shadowOffset.width);
x2 += truncf(shadowOffset.width);
y1 -= truncf(shadowOffset.height);
y2 -= truncf(shadowOffset.height);
// Blur the shadow buffer
blur<Ras>(sl, x1, x2, y1, y2);
O2Log("%p:Done Drawing shadow Image", this);
}
// And finally do the "normal" drawing
if (alpha >= 1) {
// No need for an alpha converter
agg::render_scanlines_aa(rasterizer, sl, *ren_base, span_allocator, type);
} else {
span_alpha_converter<o2agg::rgba8> alpha_converter(alpha, premultiply);
agg::span_converter<T, span_alpha_converter<o2agg::rgba8> > converter(type, alpha_converter);
agg::render_scanlines_aa(rasterizer, sl, *ren_base, span_allocator, converter);
}
O2Log("%p:Done Drawing Image", this);
}
// Used to render path
template<class Ras, class S, class T> void render_scanlines_aa_solid(Ras &rasterizer, S &sl, T &type)
{
if (shadowColor.a > 0.) {
setUpShadow();
int x = ren_base->xmin();
int y = ren_base->ymin();
int xmax = ren_base->xmax();
int ymax = ren_base->ymax();
ren_shadow->reset_clipping(true);
ren_shadow->copy_bar(x-shadowBlurRadius, y-shadowBlurRadius, xmax+shadowBlurRadius, ymax+shadowBlurRadius, o2agg::rgba::no_color());
ren_shadow->clip_box(ren_base->xmin(), ren_base->ymin(), ren_base->xmax(), ren_base->ymax());
// TODO : render to our scratch mask buffer, then blur should just draw a shadow colored (* alpha) rect using that mask
///////////////////
// Draw using our shadow rendererer using our shadow color (and global alpha)
T color = o2agg::rgba(shadowColor.r, shadowColor.g, shadowColor.b, shadowColor.a * type.opacity());
color.premultiply();
// Render to the shadow location (rounded - we are working with pixels here) so we're sure we can properly blur the shadow
// We'll take into account the fractional part when copying the shadow to the final buffer
render_scanlines_aa_solid_translate(rasterizer, sl, *ren_shadow, color, truncf(shadowOffset.width), -truncf(shadowOffset.height));
// Get the used part of the rasterizer - we don't need to blur a bigger area than that
float x1 = rasterizer.min_x();
float x2 = rasterizer.max_x();
float y1 = rasterizer.min_y();
float y2 = rasterizer.max_y();
// Add the translation done during the rendering
x1 += truncf(shadowOffset.width);
x2 += truncf(shadowOffset.width);
y1 -= truncf(shadowOffset.height);
y2 -= truncf(shadowOffset.height);
// Blur the shadow buffer
blur<Ras>(sl, x1, x2, y1, y2);
}
// And finally do the "normal" drawing
T color = type;
color.opacity(color.opacity() * alpha );
if (premultiply)
color.premultiply();
if (color.opacity() >= 1. && pixelFormat->comp_op() == o2agg::comp_op_src_over) {
// We'll use copy instead of source over when rendering a opaque path
pixelFormat->comp_op(o2agg::comp_op_src);
}
agg::render_scanlines_aa_solid(rasterizer, sl, *ren_base, color);
}
bool isRGBA() { return NO; };
bool isBGRA() { return NO; };
bool isARGB() { return NO; };
bool isABGR() { return NO; };
};
context_renderer_helper_base* helper;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba<o2agg::rgba8, agg::order_rgba> > rgba_helper;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba<o2agg::rgba8, agg::order_bgra> > bgra_helper;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba<o2agg::rgba8, agg::order_argb> > argb_helper;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba<o2agg::rgba8, agg::order_abgr> > abgr_helper;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba_pre<o2agg::rgba8, agg::order_rgba> > rgba_helper_pre;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba_pre<o2agg::rgba8, agg::order_bgra> > bgra_helper_pre;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba_pre<o2agg::rgba8, agg::order_argb> > argb_helper_pre;
typedef class context_renderer_helper<o2agg::comp_op_adaptor_rgba_pre<o2agg::rgba8, agg::order_abgr> > abgr_helper_pre;
public:
bool premultiplied;
O2Context_AntiGrain *context;
virtual ~context_renderer()
{
delete helper;
}
template<class Order> void init(agg::rendering_buffer &renderingBuffer)
{
typedef o2agg::comp_op_adaptor_rgba<o2agg::rgba8, Order> blender_type;
premultiplied = false;
helper = new context_renderer_helper<blender_type>(renderingBuffer);
helper->setPremultiply(premultiplied);
}
template<class Order> void init_pre(agg::rendering_buffer &renderingBuffer)
{
typedef o2agg::comp_op_adaptor_rgba_pre<o2agg::rgba8, Order> blender_type;
premultiplied = true;
helper = new context_renderer_helper<blender_type>(renderingBuffer);
helper->setPremultiply(premultiplied);
}
// Not sure how to better write that since we can't have virtual template methods and we don't know some type
// at compile time (like pixel format)
// But there must be some better way...
template<class Ras, class S, class T> void render_scanlines(Ras &rasterizer, S &sl, T &type)
{
if (premultiplied) {
if (helper->isRGBA()) {
((rgba_helper_pre *)helper)->render_scanlines(rasterizer, sl, type);
} else if (helper->isABGR()) {
((abgr_helper_pre *)helper)->render_scanlines(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper_pre *)helper)->render_scanlines(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper_pre *)helper)->render_scanlines(rasterizer, sl, type);
}
} else {
if (helper->isRGBA()) {
((rgba_helper *)helper)->render_scanlines(rasterizer, sl, type);
} else if (helper->isABGR()) {
((abgr_helper *)helper)->render_scanlines(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper *)helper)->render_scanlines(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper *)helper)->render_scanlines(rasterizer, sl, type);
}
}
}
template<class Ras, class S, class SA, class T> void render_scanlines_aa(Ras &rasterizer, S &sl, SA &span_allocator, T &type)
{
if (premultiplied) {
if (helper->isRGBA()) {
((rgba_helper_pre *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
} else if (helper->isABGR()) {
((abgr_helper_pre *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
} else if (helper->isBGRA()) {
((bgra_helper_pre *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
} else if (helper->isBGRA()) {
((bgra_helper_pre *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
}
} else {
if (helper->isRGBA()) {
((rgba_helper *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
} else if (helper->isABGR()) {
((abgr_helper *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
} else if (helper->isBGRA()) {
((bgra_helper *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
} else if (helper->isBGRA()) {
((bgra_helper *)helper)->render_scanlines_aa(rasterizer, sl, span_allocator, type);
}
}
}
template<class Ras, class S, class T> void render_scanlines_aa_solid(Ras &rasterizer, S &sl, T &type)
{
if (premultiplied) {
if (helper->isRGBA()) {
((rgba_helper_pre *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
} else if (helper->isABGR()) {
((abgr_helper_pre *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper_pre *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper_pre *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
}
} else {
if (helper->isRGBA()) {
((rgba_helper *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
} else if (helper->isABGR()) {
((abgr_helper *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
} else if (helper->isBGRA()) {
((bgra_helper *)helper)->render_scanlines_aa_solid(rasterizer, sl, type);
}
}
}
void setBlendMode(int blendMode)
{
helper->setBlendMode(blendMode);
}
void setShadowColor(o2agg::rgba color)
{
helper->setShadowColor(color);
}
void setShadowOffset(O2Size shadowOffset)
{
helper->setShadowOffset(shadowOffset);
}
void setShadowBlurRadius(float radius)
{
helper->setShadowBlurRadius(radius);
}
void setAlpha(float alpha)
{
helper->setAlpha(alpha);
}
void clipBox(int a, int b, int c, int d)
{
helper->clipBox(a, b, c, d);
}
};
// Make the right type test to return true when needed
template<> bool context_renderer::rgba_helper::isRGBA() { return true; };
template<> bool context_renderer::bgra_helper::isBGRA() { return true; };
template<> bool context_renderer::argb_helper::isARGB() { return true; };
template<> bool context_renderer::abgr_helper::isABGR() { return true; };
template<> bool context_renderer::rgba_helper_pre::isRGBA() { return true; };
template<> bool context_renderer::bgra_helper_pre::isBGRA() { return true; };
template<> bool context_renderer::argb_helper_pre::isARGB() { return true; };
template<> bool context_renderer::abgr_helper_pre::isABGR() { return true; };
class gradient_evaluator
{
public:
gradient_evaluator(O2FunctionRef function, bool premultiply = true, unsigned size = 4096) :
m_size(size) {
// Precalculate our colors
m_colors_lut = new o2agg::rgba[size];
float invSize = 1./size;
for (int i = 0; i < size; ++i) {
O2Float result[4] = { 1 };
O2FunctionEvaluate(function, i*invSize, result);
o2agg::rgba color;
color.r = result[0];
color.g = result[1];
color.b = result[2];
color.a = result[3];
if (premultiply)
color.premultiply();
m_colors_lut[i] = color;
}
}
~gradient_evaluator() { delete[] m_colors_lut; };
inline int size() const { return m_size; }
inline o2agg::rgba operator [] (unsigned v) const
{
return m_colors_lut[v];
}
private:
o2agg::rgba *m_colors_lut;
int m_size;
};
template <class SpanAllocator, class SpanGen> void render_scanlines_aa(O2Context_AntiGrain *self, SpanAllocator &sa, SpanGen &sg)
{
if (self->useMask) {
scanline_mask_type sl(*[self currentMask]);
self->renderer->render_scanlines_aa(*self->rasterizer, sl, sa, sg);
} else {
self->renderer->render_scanlines_aa(*self->rasterizer, *self->scanline_p8, sa, sg);
}
}
template <class Type> void render_scanlines_aa_solid(O2Context_AntiGrain *self, Type &type, BOOL packed = NO)
{
if (self->useMask) {
scanline_mask_type sl(*[self currentMask]);
self->renderer->render_scanlines_aa_solid(*self->rasterizer,sl,type);
} else {
if (packed) {
self->renderer->render_scanlines_aa_solid(*self->rasterizer,*self->scanline_p8,type);
} else {
self->renderer->render_scanlines_aa_solid(*self->rasterizer,*self->scanline_u8,type);
}
}
}
template<class gradient_func_type> void O2AGGContextDrawShading(O2Context_AntiGrain *self, O2Shading* shading, float x, float y, float width, float height)
{
typedef o2agg::pixfmt_bgra32_pre pixfmt_type; // That should be the same pixel type as the context ?
typedef pixfmt_type::color_type color_type;
typedef gradient_evaluator color_func_type;
typedef agg::span_interpolator_linear<> interpolator_type;
typedef agg::span_allocator<color_type> span_allocator_type;
typedef agg::span_gradient<color_type, interpolator_type, gradient_func_type, color_func_type> span_gradient_type;
O2GState *gState=O2ContextCurrentGState(self);
O2ClipState *clipState=O2GStateClipState(gState);
O2AffineTransform deviceTransform=gState->_deviceSpaceTransform;
agg::trans_affine deviceMatrix(deviceTransform.a,deviceTransform.b,deviceTransform.c,deviceTransform.d,deviceTransform.tx,deviceTransform.ty);
O2Point deviceStart=O2PointApplyAffineTransform([shading startPoint],deviceTransform);
O2Point deviceEnd=O2PointApplyAffineTransform([shading endPoint],deviceTransform);
double x1=deviceStart.x;
double y1=deviceStart.y;
double x2=deviceEnd.x;
double y2=deviceEnd.y;
float startValue = 0;
float endValue = 0;
if ([shading isAxial]) {
startValue = 0;
endValue = agg::calc_distance(x1,y1,x2,y2);
} else {
double scale = sqrt((deviceTransform.a * deviceTransform.a) + (deviceTransform.c * deviceTransform.c));
startValue = scale*[shading startRadius];
endValue = scale*[shading endRadius];
}
int gradientSize = ceilf(endValue - startValue);
if (gradientSize < 1) {
gradientSize = 1;
}
color_func_type color_func([shading function], [self isPremultiplied], gradientSize);
agg::trans_affine gradient_mtx;
gradient_mtx.reset();
double angle = atan2(y2-y1, x2-x1);
gradient_mtx *= agg::trans_affine_rotation(angle);
gradient_mtx *= agg::trans_affine_translation(x1, y1);
gradient_mtx.invert();
interpolator_type span_interpolator(gradient_mtx);
span_allocator_type span_allocator;
gradient_func_type gradient_func;
span_gradient_type span_gradient(span_interpolator, gradient_func, color_func, startValue, endValue);
// The rasterizing/scanline stuff
//----------------
agg::path_storage aggPath;
// We'll use a path that cover the current clipped rect
aggPath.move_to(x, y);
aggPath.line_to(x+width,y);
aggPath.line_to(x+width,y+height);
aggPath.line_to(x,y+height);
aggPath.end_poly();
agg::conv_curve<agg::path_storage> curve(aggPath);
curve.approximation_scale(deviceMatrix.scale());
self->rasterizer->add_path(curve);
render_scanlines_aa(self, span_allocator, span_gradient);
}
template <class pixfmt> void O2AGGContextDrawImage(O2Context_AntiGrain *self, agg::rendering_buffer &imageBuffer, const agg::trans_affine &transform, ImageInterpolationType interpolationType)
{
BOOL resample = NO;
if (interpolationType != kImageInterpolationNone) {
// Enable resampling if we have some big downscaling
double x, y;
transform.scaling_abs(&x, &y);
resample = x > 1.125 || y > 1.125;
}
agg::span_allocator<typename pixfmt::color_type> sa;
pixfmt img_pixf(imageBuffer);
typedef agg::image_accessor_clone<pixfmt> img_accessor_type;
img_accessor_type ia(img_pixf);
typedef agg::span_interpolator_linear<agg::trans_affine> interpolator_type;
interpolator_type interpolator(transform);
if (resample == NO) {
// Use a filter according to the wanted interpolation quality - no resampling needed
switch (interpolationType) {
case kImageInterpolationNone: {
typedef agg::span_image_filter_rgba_nn<img_accessor_type, interpolator_type> span_gen_type;
span_gen_type sg(ia, interpolator);
render_scanlines_aa(self, sa, sg);
}
break;
default:
case kImageInterpolationBilinear: {
typedef agg::span_image_filter_rgba_bilinear<img_accessor_type, interpolator_type> span_gen_type;
span_gen_type sg(ia, interpolator);
render_scanlines_aa(self, sa, sg);
}
break;
case kImageInterpolationBicubic: {
agg::image_filter_bicubic filter_kernel;
agg::image_filter_lut filter(filter_kernel, true);
typedef agg::span_image_filter_rgba<img_accessor_type, interpolator_type> span_gen_type;
span_gen_type sg(ia, interpolator, filter);
render_scanlines_aa(self, sa, sg);
}
break;
#if 0
//unused
case kImageInterpolationLanczos: {
agg::image_filter_lanczos filter_kernel(2.f);
agg::image_filter_lut filter(filter_kernel, true);
typedef agg::span_image_filter_rgba<img_accessor_type, interpolator_type> span_gen_type;
span_gen_type sg(ia, interpolator, filter);
render_scanlines_aa(self, sa, sg);
}
break;
#endif
case kImageInterpolationRepeat: {
typedef agg::image_accessor_wrap<pixfmt, agg::wrap_mode_repeat, agg::wrap_mode_repeat> img_accessor_type;
img_accessor_type ia(img_pixf);
typedef agg::span_image_filter_rgba_bilinear<img_accessor_type, interpolator_type> span_gen_type;
span_gen_type sg(ia, interpolator);
render_scanlines_aa(self, sa, sg);
}
break;
}
} else {
// Use a filter according to the wanted interpolation quality - use resampling
switch (interpolationType) {
default:
case kImageInterpolationBilinear: {
agg::image_filter_bilinear filter_kernel;
agg::image_filter_lut filter(filter_kernel, true);
typedef o2agg::span_image_resample_rgba_affine<img_accessor_type> span_gen_type;
span_gen_type sg(ia, interpolator, filter);
render_scanlines_aa(self, sa, sg);
}
break;
case kImageInterpolationBicubic: {
agg::image_filter_bicubic filter_kernel;
agg::image_filter_lut filter(filter_kernel, true);
typedef o2agg::span_image_resample_rgba_affine<img_accessor_type> span_gen_type;
span_gen_type sg(ia, interpolator, filter);
render_scanlines_aa(self, sa, sg);
}
break;
#if 0
//unused
case kImageInterpolationLanczos: {
agg::image_filter_lanczos filter_kernel(2.f);
agg::image_filter_lut filter(filter_kernel, true);
typedef o2agg::span_image_resample_rgba_affine<img_accessor_type> span_gen_type;
span_gen_type sg(ia, interpolator, filter);
render_scanlines_aa(self, sa, sg);
}
break;
#endif
case kImageInterpolationRepeat: {
typedef agg::image_accessor_wrap<pixfmt, agg::wrap_mode_repeat, agg::wrap_mode_repeat> img_accessor_type;
img_accessor_type ia(img_pixf);
agg::image_filter_bilinear filter_kernel;
agg::image_filter_lut filter(filter_kernel, true);
// !!! don't use the o2agg version with a "repeat" accessor - it seems some y wrapping is missing in the optimized
// resampling code - so use the slower plain AGG version for now
typedef agg::span_image_resample_rgba_affine<img_accessor_type> span_gen_type;
span_gen_type sg(ia, interpolator, filter);
render_scanlines_aa(self, sa, sg);
}
break;
}
}
}
template <class StrokeType> void O2AGGContextSetStroke(O2Context_AntiGrain *self, StrokeType &stroke, const agg::trans_affine &deviceMatrix)
{
O2GState *gState=O2ContextCurrentGState(self);
stroke.approximation_scale(deviceMatrix.scale());
switch(gState->_lineJoin){
case kO2LineJoinMiter:
stroke.line_join(agg::miter_join);
break;
case kO2LineJoinRound:
stroke.line_join(agg::round_join);
break;
case kO2LineJoinBevel:
stroke.line_join(agg::bevel_join);
break;
}
switch(gState->_lineCap){
case kO2LineCapButt:
stroke.line_cap(agg::butt_cap);
break;
case kO2LineCapRound:
stroke.line_cap(agg::round_cap);
break;
case kO2LineCapSquare:
stroke.line_cap(agg::square_cap);
break;
}
stroke.width(gState->_lineWidth);
}
template <class StrokeType> void O2AGGContextStrokePath(O2Context_AntiGrain *self, StrokeType &stroke, o2agg::rgba color, const agg::trans_affine &deviceMatrix)
{
agg::conv_transform<StrokeType, agg::trans_affine> trans(stroke, deviceMatrix);
self->rasterizer->add_path(trans);
self->rasterizer->filling_rule(agg::fill_non_zero);
render_scanlines_aa_solid(self, color, NO);
}
template <class StrokeType> void O2AGGStrokeToO2Path(O2Context_AntiGrain *self, StrokeType &stroke)
{
double x,y;
int type;
O2ContextBeginPath(self);
while ((type = stroke.vertex(&x,&y)) != agg::path_cmd_stop) {
switch (type & agg::path_cmd_mask) {
case agg::path_cmd_move_to: {
O2ContextMoveToPoint(self, x, y);
}
break;
case agg::path_cmd_line_to: {
O2ContextAddLineToPoint(self, x, y);
}
break;
case agg::path_cmd_curve3: {
// x, y are ctrl_x, ctrl_y
double to_x, to_y;
stroke.vertex(&to_x,&to_y);
O2ContextAddQuadCurveToPoint(self, x, y, to_x, to_y);
}
break;
case agg::path_cmd_curve4: {
// x, y are ctrl1_x, ctrl1_y
double ctrl2_x, ctrl2_y;
stroke.vertex(&ctrl2_x,&ctrl2_y);
double to_x, to_y;
stroke.vertex(&to_x,&to_y);
O2ContextAddCurveToPoint(self, x, y, ctrl2_x, ctrl2_y, to_x, to_y);
}
break;
case agg::path_cmd_end_poly: {
if (type & agg::path_flags_close) {
O2ContextClosePath(self);
}
}
break;
default:
break;
}
}
}
#endif
@interface O2AGGGState : O2GState
{
float alpha;
}
@end
@implementation O2Context_AntiGrain
#ifdef ANTIGRAIN_PRESENT
// If AntiGrain is not present it will just be a non-overriding subclass of the builtin context, so no problems
static void O2AGGContextFillPathWithRule(O2Context_AntiGrain *self,o2agg::rgba color, const agg::trans_affine &deviceMatrix,agg::filling_rule_e fillingRule) {
agg::conv_curve<agg::path_storage> curve(*(self->path));
agg::conv_transform<agg::conv_curve<agg::path_storage>, agg::trans_affine> trans(curve, deviceMatrix);
curve.approximation_scale(deviceMatrix.scale());
self->rasterizer->add_path(trans);
self->rasterizer->filling_rule(fillingRule);
// Use the packed scanline - better for filling solid path
render_scanlines_aa_solid(self,color,YES);
}
static void O2AGGContextStrokePath(O2Context_AntiGrain *self,o2agg::rgba color, const agg::trans_affine &deviceMatrix) {
agg::conv_curve<agg::path_storage> curve(*(self->path));
curve.approximation_scale(deviceMatrix.scale());
O2GState *gState=O2ContextCurrentGState(self);
if (gState->_dashLengthsCount > 1) {
agg::conv_dash<agg::conv_curve<agg::path_storage> > dash(curve);
agg::conv_stroke<agg::conv_dash<agg::conv_curve<agg::path_storage> > > stroke(dash);
dash.dash_start(gState->_dashPhase);
for (int i = 0; i < gState->_dashLengthsCount; i += 2) {
if (i == gState->_dashLengthsCount - 1) {
// Last dash without an length for the next space
dash.add_dash(gState->_dashLengths[i], 0);
} else {
dash.add_dash(gState->_dashLengths[i], gState->_dashLengths[i+1]);
}
}
O2AGGContextSetStroke<typeof(stroke)>(self,stroke,deviceMatrix);
O2AGGContextStrokePath<typeof(stroke)>(self,stroke,color,deviceMatrix);
} else {
// Just stroke
agg::conv_stroke<agg::conv_curve<agg::path_storage> > stroke(curve);
O2AGGContextSetStroke<typeof(stroke)>(self,stroke,deviceMatrix);
O2AGGContextStrokePath<typeof(stroke)>(self,stroke,color,deviceMatrix);
}
}
static void O2AGGReplaceStrokedPath(O2Context_AntiGrain *self, const agg::trans_affine &deviceMatrix) {
agg::conv_curve<agg::path_storage> curve(*(self->path));
curve.approximation_scale(deviceMatrix.scale());
O2GState *gState=O2ContextCurrentGState(self);
if (gState->_dashLengthsCount > 1) {
agg::conv_dash<agg::conv_curve<agg::path_storage> > dash(curve);
agg::conv_stroke<agg::conv_dash<agg::conv_curve<agg::path_storage> > > stroke(dash);
dash.dash_start(gState->_dashPhase);
for (int i = 0; i < gState->_dashLengthsCount; i += 2) {
if (i == gState->_dashLengthsCount - 1) {
// Last dash without an length for the next space
dash.add_dash(gState->_dashLengths[i], 0);
} else {
dash.add_dash(gState->_dashLengths[i], gState->_dashLengths[i+1]);
}
}
O2AGGContextSetStroke<typeof(stroke)>(self,stroke,deviceMatrix);
O2AGGStrokeToO2Path<typeof(stroke)>(self,stroke);
} else {
// Just stroke
agg::conv_stroke<agg::conv_curve<agg::path_storage> > stroke(curve);
O2AGGContextSetStroke<typeof(stroke)>(self,stroke,deviceMatrix);
O2AGGStrokeToO2Path<typeof(stroke)>(self,stroke);
}
}
/* Transfer path from Onyx2D to AGG. Not a very expensive operation, tessellation, stroking and rasterization are the expensive pieces
*/
static void buildAGGPathFromO2PathAndTransform(agg::path_storage *aggPath,O2PathRef path, const O2AffineTransform &xform){
const unsigned char *elements=O2PathElements(path);
const O2Point *points=O2PathPoints(path);
unsigned i,numberOfElements=O2PathNumberOfElements(path),pointIndex;
pointIndex=0;
aggPath->remove_all();
for(i=0;i<numberOfElements;i++){
switch(elements[i]){
case kO2PathElementMoveToPoint:{
O2Point point=O2PointApplyAffineTransform(points[pointIndex++],xform);
aggPath->move_to(point.x,point.y);
}
break;
case kO2PathElementAddLineToPoint:{
O2Point point=O2PointApplyAffineTransform(points[pointIndex++],xform);
aggPath->line_to(point.x,point.y);
}
break;
case kO2PathElementAddCurveToPoint:{
O2Point cp1=O2PointApplyAffineTransform(points[pointIndex++],xform);
O2Point cp2=O2PointApplyAffineTransform(points[pointIndex++],xform);
O2Point end=O2PointApplyAffineTransform(points[pointIndex++],xform);
aggPath->curve4(cp1.x,cp1.y,cp2.x,cp2.y,end.x,end.y);
}
break;
case kO2PathElementAddQuadCurveToPoint:{
O2Point cp1=O2PointApplyAffineTransform(points[pointIndex++],xform);
O2Point cp2=O2PointApplyAffineTransform(points[pointIndex++],xform);
aggPath->curve3(cp1.x,cp1.y,cp2.x,cp2.y);
}
break;
case kO2PathElementCloseSubpath:
aggPath->end_poly();
break;
}
}
}
static void transferPath(O2Context_AntiGrain *self,O2PathRef path, const O2AffineTransform &xform) {
buildAGGPathFromO2PathAndTransform(self->path, path, xform);
}
#ifdef O2AGG_GLYPH_SUPPORT
- (KTFont*)_cachedKTFontWithFont:(O2Font *)font name:(NSString *)name size:(float)size
{
static NSMutableDictionary *kfontCache = nil;
static NSMutableArray *kfontLRU = nil;
if (kfontCache == nil) {
kfontCache = [[NSMutableDictionary alloc] initWithCapacity:kKFontCacheSize];
}
if (kfontLRU == nil) {
kfontLRU = [[NSMutableArray alloc] initWithCapacity:kKFontCacheSize];
}
NSString *key=[NSString stringWithFormat:@"%@-%f", name, size];
KTFont *kfont = [kfontCache objectForKey:key];
if (kfont) {
[kfontLRU removeObject:key];
}
// Move the font to the top of our LRU list
[kfontLRU insertObject:key atIndex:0];
if (kfont == nil) {
kfont = [[[KTFont alloc] initWithFont:font size:size] autorelease];
[kfontCache setObject:kfont forKey:key];
// Remove the LRU if we reach the max size
if ([kfontLRU count] > kKFontCacheSize) {
id lastKey = [kfontLRU lastObject];
[kfontCache removeObjectForKey:lastKey];
[kfontLRU removeLastObject];
}
}
return kfont;
}
unsigned O2AGGContextShowGlyphs(O2Context_AntiGrain *self, const O2Glyph *glyphs, const O2Size *advances, unsigned count)
{
unsigned num_glyphs = 0;
// All context use the same font manager - protect acceses
@synchronized([self class]) {
if (font_manager == 0) {
font_engine = new font_engine_type(::GetDC(NULL));
font_manager = new font_manager_type(*font_engine);
}
// Pipeline to process the vectors glyph paths (curves)
typedef agg::conv_curve<font_manager_type::path_adaptor_type> conv_curve_type;
conv_curve_type curves(font_manager->path_adaptor());
O2GState *gState=O2ContextCurrentGState(self);
O2Font *font=O2GStateFont(gState);
NSString *fontName = [(NSString *)O2FontCopyFullName(font) autorelease];
float pointSize = O2GStatePointSize(gState);
O2AffineTransform Trm=self->_textMatrix;
O2AffineTransform deviceTransform=gState->_deviceSpaceTransform;
agg::trans_affine deviceMatrix(deviceTransform.a,deviceTransform.b,deviceTransform.c,deviceTransform.d,deviceTransform.tx,deviceTransform.ty);
// Round the drawing start point - that helps at killing blury text
Trm.tx = roundf(Trm.tx);
Trm.ty = roundf(Trm.ty);
agg::trans_affine trmMatrix(Trm.a,Trm.b,Trm.c,Trm.d,Trm.tx,Trm.ty);
agg::trans_affine transformMatrix = deviceMatrix;
transformMatrix.premultiply(trmMatrix);
O2ColorRef fillColor=O2ColorConvertToDeviceRGB(gState->_fillColor);
const float *fillComps=O2ColorGetComponents(fillColor);
o2agg::rgba aggFillColor(fillComps[0],fillComps[1],fillComps[2],fillComps[3]);
O2ColorRelease(fillColor);
self->rasterizer->filling_rule(agg::fill_non_zero);
font_engine->hinting(false); // For some reason, it looks better without hinting...
font_engine->height((int)pointSize);
font_engine->width(0.); // Automatic width
font_engine->flip_y(false);
self->rasterizer->reset();
if(font_engine->create_font([fontName UTF8String], agg::glyph_ren_outline))
{
agg::conv_transform<conv_curve_type, agg::trans_affine> trans(curves, transformMatrix);
CGSize defaultAdvances[count];
if(advances == NULL) {
// Using a KTFont because we need to get the advancements the same way the layout manager is
// getting them.
// Of course, it would be better if the layout manager could give us the advances it wants us to use...
KTFont *kfont = [self _cachedKTFontWithFont:font name:fontName size:pointSize];
[kfont getAdvancements:defaultAdvances forGlyphs:glyphs count:count];
for(int i=0;i<count;i++){
defaultAdvances[i].width+=gState->_characterSpacing;
}
advances = defaultAdvances;
}
double x = 0;
double y = 0;
const O2Glyph* p = glyphs;
for (int i = 0; i < count; ++i)
{
const agg::glyph_cache* glyph = font_manager->glyph(*p);
if(glyph)
{
font_manager->init_embedded_adaptors(glyph, x, y);
switch(glyph->data_type)
{
case agg::glyph_data_outline: {
self->rasterizer->add_path(trans);
break;
}
default:
// No data to process
break;
}
// increment pen position
x += advances[i].width;
y += advances[i].height;
++num_glyphs;
}
++p;
}
render_scanlines_aa_solid(self,aggFillColor);
O2ContextConcatAdvancesToTextMatrix(self,advances,num_glyphs);
}
}
return num_glyphs;
}
#endif
-initWithSurface:(O2Surface *)surface flipped:(BOOL)flipped {
[super initWithSurface:surface flipped:flipped];
if (o2agg::SSE2checked == false) {
o2agg::SSE2checked = true;
o2agg::hasSSE2 = cpuHasSSE2();
}
int bytesPerRow = O2SurfaceGetBytesPerRow(surface);
renderingBuffer=new agg::rendering_buffer((unsigned char *)O2SurfaceGetPixelBytes(surface),O2SurfaceGetWidth(surface),O2SurfaceGetHeight(surface),bytesPerRow);
rasterizer=new RasterizerType();
scanline_u8=new agg::scanline_u8;
scanline_p8=new agg::scanline_p8;
// Use with the right order depending of the bitmap info of the surface - we'll probably want to pass a pixel type here instead of an order to support non 32 bits surfaces and pre/no pre
renderer = new context_renderer();
O2BitmapInfo bitmapInfo = O2ImageGetBitmapInfo(surface);
renderer->context = self;
/*
AlphaFirst => The Alpha channel is next to the Red channel
(ARGB and BGRA are both Alpha First formats)
AlphaLast => The Alpha channel is next to the Blue channel
(RGBA and ABGR are both Alpha Last formats)
LittleEndian => Blue comes before Red
(BGRA and ABGR are Little endian formats)
BigEndian => Red comes before Blue
(ARGB and RGBA are Big endian formats).
*/
switch (bitmapInfo & kO2BitmapByteOrderMask) {
case kO2BitmapByteOrder32Big:
switch (bitmapInfo & kO2BitmapAlphaInfoMask) {
case kO2ImageAlphaPremultipliedLast:
renderer->init_pre<agg::order_rgba>(*renderingBuffer);
break;
case kO2ImageAlphaLast:
renderer->init<agg::order_rgba>(*renderingBuffer);
break;
case kO2ImageAlphaPremultipliedFirst:
renderer->init_pre<agg::order_argb>(*renderingBuffer);
break;
case kO2ImageAlphaFirst:
renderer->init<agg::order_argb>(*renderingBuffer);
break;
default:
O2Log("UNKNOW ALPHA : %d", bitmapInfo & kO2BitmapAlphaInfoMask);
renderer->init<agg::order_bgra>(*renderingBuffer);
}
break;
case kO2BitmapByteOrderDefault:
case kO2BitmapByteOrder32Little:
switch (bitmapInfo & kO2BitmapAlphaInfoMask) {
case kO2ImageAlphaPremultipliedLast:
renderer->init_pre<agg::order_abgr>(*renderingBuffer);
break;
case kO2ImageAlphaLast:
renderer->init<agg::order_abgr>(*renderingBuffer);
break;
case kO2ImageAlphaPremultipliedFirst:
renderer->init_pre<agg::order_bgra>(*renderingBuffer);
break;
case kO2ImageAlphaFirst:
renderer->init<agg::order_bgra>(*renderingBuffer);
break;
default:
O2Log("UNKNOW ALPHA : %d", bitmapInfo & kO2BitmapAlphaInfoMask);
renderer->init<agg::order_bgra>(*renderingBuffer);
}
break;
default:
O2Log("UNKNOW ORDER : %x",bitmapInfo & kO2BitmapByteOrderMask);
renderer->init<agg::order_bgra>(*renderingBuffer);
}
path=new agg::path_storage();
return self;
}
-(void)dealloc {
[savedClipPhases release];
delete renderer;
delete renderingBuffer;
delete rasterizer;
delete path;
delete scanline_u8;
delete scanline_p8;
if (baseRendererAlphaMask[0]) {
for (int i = 0; i < 2; ++i) {
free(rBufAlphaMask[i]->buf());
delete rBufAlphaMask[i];
delete alphaMask[i];
delete pixelFormatAlphaMask[i];
delete baseRendererAlphaMask[i];
delete solidScanlineRendererAlphaMask[i];
}
}
[super dealloc];
}
-(BOOL)supportsGlobalAlpha
{
return YES;
}
- (void)createMaskRenderer
{
// We use two gray masks to render our alpha mask - one for the current mask, one to render a new clipping path using the current mask
for (int i = 0; i < 2; ++i) {
O2Surface *surface = [self surface];
// For some still mysterious reason, if we don't allocate one additional line, we sometimes get some crash when rendering the mask
// So we'll just extend that buffer until we fix the problem at its root
void *alphaBuffer = malloc(O2SurfaceGetWidth(surface)*(O2SurfaceGetHeight(surface)+1));
rBufAlphaMask[i] = new agg::rendering_buffer((unsigned char *)alphaBuffer, O2SurfaceGetWidth(surface),O2SurfaceGetHeight(surface), O2SurfaceGetWidth(surface));
alphaMask[i] = new MaskType(*rBufAlphaMask[i]);
pixelFormatAlphaMask[i] = new pixfmt_alphaMaskType(*rBufAlphaMask[i]);
baseRendererAlphaMask[i] = new BaseRendererWithAlphaMaskType(*pixelFormatAlphaMask[i]);
solidScanlineRendererAlphaMask[i] = new agg::renderer_scanline_aa_solid<BaseRendererWithAlphaMaskType>(*baseRendererAlphaMask[i]);
solidScanlineRendererAlphaMask[i]->color(agg::gray8(255, 255));
}
}
- (RasterizerType *)rasterizer
{
return rasterizer;
}
- (context_renderer *)renderer;
{
return renderer;
}
- (BOOL)useMask
{
return useMask;
}
- (BOOL)isPremultiplied;
{
return renderer->premultiplied;
}
- (MaskType*)currentMask
{
if (baseRendererAlphaMask[0] == NULL) {
[self createMaskRenderer];
}
return alphaMask[currentMask];
}
- (void)setFillAlpha:(O2Float)alpha
{
// It's actually handled by the global alpha - that's the way it's supposed to work in Cocoa
}
- (void)setStrokeAlpha:(O2Float)alpha
{
// It's actually handled by the global alpha - that's the way it's supposed to work in Cocoa
}
-(void)updateBlendMode
{
// Onyx2D -> AGG blend mode conversion
// O2Log("Setting blend mode to %d", blendMode);
enum o2agg::comp_op_e blendModeMap[28]={
o2agg::comp_op_src_over,
o2agg::comp_op_multiply,
o2agg::comp_op_screen,
o2agg::comp_op_overlay,
o2agg::comp_op_darken,
o2agg::comp_op_lighten,
o2agg::comp_op_color_dodge,
o2agg::comp_op_color_burn,
o2agg::comp_op_hard_light,
o2agg::comp_op_soft_light,
o2agg::comp_op_difference,
o2agg::comp_op_exclusion,
o2agg::comp_op_src_over, // should be Hue
o2agg::comp_op_src_over, // should be Saturation
o2agg::comp_op_color,
o2agg::comp_op_src_over, // should be Luminosity
o2agg::comp_op_clear,
o2agg::comp_op_src,
o2agg::comp_op_src_in,
o2agg::comp_op_src_out,
o2agg::comp_op_src_atop,
o2agg::comp_op_dst_over,
o2agg::comp_op_dst_in,
o2agg::comp_op_dst_out,
o2agg::comp_op_dst_atop,
o2agg::comp_op_xor,
o2agg::comp_op_plus_darker,
o2agg::comp_op_minus, // shoud be MinusLighter
};
O2GState *gState=O2ContextCurrentGState(self);
renderer->setBlendMode(blendModeMap[O2GStateBlendMode(gState)]);
renderer->setAlpha(O2GStateAlpha(gState));
O2ColorRef shadowColor = gState->_shadowColor;
if (shadowColor) {
shadowColor = O2ColorConvertToDeviceRGB(shadowColor);
const O2Float *components = O2ColorGetComponents(shadowColor);
renderer->setShadowColor(o2agg::rgba(components[0], components[1], components[2], components[3]));
renderer->setShadowBlurRadius(gState->_shadowBlur);
renderer->setShadowOffset(gState->_shadowOffset);
O2ColorRelease(shadowColor);
} else {
renderer->setShadowColor(o2agg::rgba(0, 0, 0, 0));
}
}
// Update the AGG alpha mask from current GState clip phases
- (void)updateMask
{
if (maskValid == YES) {
return;
}
currentMask = 0;
useMask = NO;
if ([savedClipPhases count]) {
typedef agg::conv_curve<agg::path_storage> conv_crv_type;
typedef agg::conv_transform<conv_crv_type> transStroke;
self->rasterizer->reset();
self->rasterizer->clip_box(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
O2GState *gState=O2ContextCurrentGState(self);
O2AffineTransform deviceTransform=gState->_deviceSpaceTransform;
agg::trans_affine deviceMatrix(deviceTransform.a,deviceTransform.b,deviceTransform.c,deviceTransform.d,deviceTransform.tx,deviceTransform.ty);
agg::path_storage aggPath;
for (int i = 0; i < [savedClipPhases count]; ++i) {
O2ClipPhase *phase = [savedClipPhases objectAtIndex:i];
switch(O2ClipPhasePhaseType(phase)){
case O2ClipPhaseNonZeroPath:
case O2ClipPhaseEOPath: {
O2PathRef maskPath = O2ClipPhaseObject(phase);
// We can ignore path that are rect - the default clipping takes that into account
NSRect rect;
if (!O2PathIsRect(maskPath, &rect)) {
if (useMask == NO) {
// Fill the mask content on first use
useMask = YES;
if (baseRendererAlphaMask[0] == NULL) {
[self createMaskRenderer];
}
baseRendererAlphaMask[0]->clip_box(self->_vpx-1,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
// We only need to fill the clipped rect area
baseRendererAlphaMask[0]->copy_bar(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight, agg::gray8(255, 255));
}
// Switch masks
currentMask = !currentMask;
// Clear the new mask
baseRendererAlphaMask[currentMask]->clip_box(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
// We only need to clear the clipped rect area
baseRendererAlphaMask[currentMask]->copy_bar(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight, agg::gray8(0));
buildAGGPathFromO2PathAndTransform(&aggPath,maskPath,O2AffineTransformIdentity);
agg::conv_curve<agg::path_storage> curve(aggPath);
curve.approximation_scale(deviceMatrix.scale());
O2ClipPhaseType phaseType = O2ClipPhasePhaseType(phase);
if (phaseType == O2ClipPhaseNonZeroPath)
rasterizer->filling_rule(agg::fill_non_zero);
else
rasterizer->filling_rule(agg::fill_even_odd);
rasterizer->add_path(curve);
// Render the path masked by the previous mask
scanline_mask_type sl(*self->alphaMask[!currentMask]);
renderer->render_scanlines(*rasterizer, sl, *solidScanlineRendererAlphaMask[currentMask]);
}
break;
}
case O2ClipPhaseMask:
O2Log("%@:Clip to mask unsupported", self);
// Unsupported for now
break;
}
}
}
maskValid = YES;
}
// Clip the viewport with the path bounds
static void O2ContextClipViewportToPath(O2Context_builtin *self,O2Path *path) {
O2Rect viewport=O2RectMake(self->_vpx,self->_vpy,self->_vpwidth,self->_vpheight);
O2Rect rect=O2PathGetBoundingBox(path);
rect=O2RectIntegral(rect);
viewport=O2RectIntersection(viewport,rect);
self->_vpx=viewport.origin.x;
self->_vpy=viewport.origin.y;
self->_vpwidth=viewport.size.width;
self->_vpheight=viewport.size.height;
}
static void O2ContextClipViewportToState(O2Context_builtin *self, O2ClipState *clipState)
{
// Note : this is basically what [O2Context_builtin clipToState:] is doing
O2GState *gState=O2ContextCurrentGState(self);
NSArray *phases=[O2GStateClipState(gState) clipPhases];
O2ContextDeviceClipReset_builtin(self);
for(O2ClipPhase *phase in phases) {
O2Path *path;
switch(O2ClipPhasePhaseType(phase)){
case O2ClipPhaseNonZeroPath:
case O2ClipPhaseEOPath:
path=O2ClipPhaseObject(phase);
O2ContextClipViewportToPath(self,path);
break;
case O2ClipPhaseMask:
break;
}
}
}
-(void)clipToState:(O2ClipState *)clipState {
// No need to change the clipping if the clip phases are the same as before
NSArray *clipPhases = [clipState clipPhases];
if ([clipPhases isEqualToArray:savedClipPhases]) {
return;
}
[savedClipPhases release];
savedClipPhases = [clipPhases copy];
/*
The builtin Onyx2D renderer only supports viewport clipping (one integer rect), so once the superclass has clipped
the viewport is what we want to clip to also. The base AGG renderer also does viewport clipping, so we just set it.
*/
#ifdef O2AGG_GLYPH_SUPPORT
O2GState *gState=O2ContextCurrentGState(self);
if (gState->_shouldSmoothFonts == YES) {
// We don't call the super method because we don't care about expensive GDI clipping when we use no GDI for the drawing
O2ContextClipViewportToState(self, clipState);
} else
#endif
{
[super clipToState:clipState];
}
/// This is setting the clipping rect englobing our clipping states
// The real precise clipping mask for non-rect clipping will be built on demand
O2ContextClipViewportToState(self, clipState);
renderer->clipBox(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
// That will force a rebuild of the mask next time we need to draw something - no need to build it now as it might
// change again before we need it for drawing
maskValid = NO;
}
-(void)drawPath:(O2PathDrawingMode)drawingMode {
renderer->premultiplied = YES;
BOOL doFill=NO;
BOOL doEOFill=NO;
BOOL doStroke=NO;
[self updateMask];
[self updateBlendMode];
rasterizer->reset();
rasterizer->clip_box(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
switch(drawingMode){
case kO2PathFill:
doFill=YES;
break;
case kO2PathEOFill:
doEOFill=YES;
break;
case kO2PathStroke:
doStroke=YES;
break;
case kO2PathFillStroke:
doFill=YES;
doStroke=YES;
break;
case kO2PathEOFillStroke:
doEOFill=YES;
doStroke=YES;
break;
}
O2GState *gState=O2ContextCurrentGState(self);
transferPath(self,(O2PathRef)_path,O2AffineTransformInvert(gState->_userSpaceTransform));
O2AffineTransform deviceTransform=gState->_deviceSpaceTransform;
agg::trans_affine aggDeviceMatrix(deviceTransform.a,deviceTransform.b,deviceTransform.c,deviceTransform.d,deviceTransform.tx,deviceTransform.ty);
if(doFill || doEOFill) {
O2PatternRef pattern = O2ColorGetPattern(gState->_fillColor);
if (pattern) {
// Note: pattern support is incomplete :
// We don't make much use of the pattern phase, pattern color or pattern bounds
// Create a context with the size of our pattern tile
O2Surface *surface=[self createSurfaceWithWidth:[pattern xstep] height:[pattern ystep]];
O2Context_AntiGrain *context=[[self->isa alloc] initWithSurface:surface flipped:YES];
// Draw the pattern tile
[pattern drawInContext:context];
O2ContextRelease(context);
// Build the global transform from the pattern to the device
O2AffineTransform matrix = O2AffineTransformConcat( ([pattern matrix]), O2AffineTransformInvert(gState->_userSpaceTransform));
agg::trans_affine globalTransform(matrix.a, matrix.b, matrix.c, matrix.d, matrix.tx, matrix.ty);
globalTransform.multiply(aggDeviceMatrix);
globalTransform.invert();
// Create an agg buffer from the Surface content
uint8_t *imgBytes = (uint8_t *)[surface pixelBytes];
agg::rendering_buffer imageBuffer(imgBytes, O2SurfaceGetWidth(surface) , O2SurfaceGetHeight(surface), O2SurfaceGetBytesPerRow(surface));
// Fill the current agg path with the repeated tile
agg::conv_curve<agg::path_storage> curve(*(self->path));
agg::conv_transform<agg::conv_curve<agg::path_storage>, agg::trans_affine> trans(curve, aggDeviceMatrix);
self->rasterizer->add_path(trans);
renderer->premultiplied = YES;
O2AGGContextDrawImage<o2agg::pixfmt_bgra32_pre>(self, imageBuffer, globalTransform, kImageInterpolationRepeat);
[surface release];
} else {
O2ColorRef fillColor=O2ColorConvertToDeviceRGB(gState->_fillColor);
const float *fillComps=O2ColorGetComponents(fillColor);
o2agg::rgba aggFillColor(fillComps[0],fillComps[1],fillComps[2],fillComps[3]);
if (doFill) {
O2AGGContextFillPathWithRule(self,aggFillColor,aggDeviceMatrix,agg::fill_non_zero);
} else {
O2AGGContextFillPathWithRule(self,aggFillColor,aggDeviceMatrix,agg::fill_even_odd);
}
O2ColorRelease(fillColor);
}
}
if(doStroke){
// Note: pattern stroking not supported for now
O2ColorRef strokeColor=O2ColorConvertToDeviceRGB(gState->_strokeColor);
const float *strokeComps=O2ColorGetComponents(strokeColor);
o2agg::rgba aggStrokeColor(strokeComps[0],strokeComps[1],strokeComps[2],strokeComps[3]);
O2AGGContextStrokePath(self,aggStrokeColor,aggDeviceMatrix);
O2ColorRelease(strokeColor);
}
O2PathReset(_path);
}
-(void)replacePathWithStrokedPath
{
O2GState *gState=O2ContextCurrentGState(self);
transferPath(self,(O2PathRef)_path,O2AffineTransformInvert(gState->_userSpaceTransform));
O2AffineTransform deviceTransform=gState->_deviceSpaceTransform;
agg::trans_affine aggDeviceMatrix(deviceTransform.a,deviceTransform.b,deviceTransform.c,deviceTransform.d,deviceTransform.tx,deviceTransform.ty);
O2AGGReplaceStrokedPath(self,aggDeviceMatrix);
}
-(void)drawImage:(O2Image *)image inRect:(O2Rect)rect
{
int bpp = O2ImageGetBitsPerPixel(image);
if (bpp == 32) { // We don't support other modes for now
int width = O2ImageGetWidth(image);
int height = O2ImageGetHeight(image);
int bytesPerRow = O2ImageGetBytesPerRow(image);
int bitmapInfo = O2ImageGetBitmapInfo(image);
[self updateMask];
[self updateBlendMode];
rasterizer->reset();
rasterizer->clip_box(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
agg::path_storage p2;
p2.move_to(rect.origin.x, rect.origin.y);
p2.line_to(rect.origin.x+rect.size.width, rect.origin.y);
p2.line_to(rect.origin.x+rect.size.width, rect.origin.y+rect.size.height);
p2.line_to(rect.origin.x, rect.origin.y+rect.size.height);
p2.close_polygon();
O2GState *gState=O2ContextCurrentGState(self);
O2AffineTransform deviceTransform= gState->_deviceSpaceTransform;
agg::trans_affine transform(deviceTransform.a,deviceTransform.b,deviceTransform.c,deviceTransform.d,deviceTransform.tx,deviceTransform.ty);
agg::conv_transform<agg::path_storage> trans(p2, transform); // Global Affine transformer
rasterizer->add_path(trans);
// Flipped scaled transfrom from the original image bounds to the destination rect
O2AffineTransform imageTransform = O2AffineTransformMakeTranslation(rect.origin.x, rect.origin.y + rect.size.height);
imageTransform = O2AffineTransformScale(imageTransform, rect.size.width/float(width), -rect.size.height/float(height));
agg::trans_affine globalTransform(imageTransform.a, imageTransform.b, imageTransform.c, imageTransform.d, imageTransform.tx, imageTransform.ty);
globalTransform.multiply(transform);
// We use bilinear scaling for images that need to be shrunk. At 100% scale size it preserves the image better.
// Remember we don't even think about doing this for images that need to expand; those should always use the bicubic filter; however,
// that is user-selectable.
bool reducedScale = true;
bool isUnity = true;
globalTransform.invert();
double scaleX;
double scaleY;
globalTransform.scaling_abs(&scaleX, &scaleY);
if (scaleX > .995 || scaleY > .995)
{
reducedScale = false;
}
if (fabs(scaleX - 1.) > .0001 || fabs(scaleY - 1.) > .0001)
{
// printf(">>>> %lf -- %lf\n",scaleX, scaleY);
isUnity = false;
}
// Round the physical screen coordinate to an integer boundary so filtering works better. This seems to make images that are 1x1 rasterize
// exactly. Changing the pixel coordinates on smaller scaled images introuduces unpleasant artifacts.
if (isUnity)
{
globalTransform.tx = round(globalTransform.tx);
globalTransform.ty = round(globalTransform.ty);
}
uint8_t *imgBytes = (uint8_t *)[image directBytes];
agg::rendering_buffer imageBuffer(imgBytes, width, height, bytesPerRow);
BOOL noInterpolation = isUnity;
int interpolationQuality = [gState interpolationQuality];
if (interpolationQuality == kO2InterpolationNone) {
noInterpolation = YES;
}
ImageInterpolationType interpolationType = kImageInterpolationBilinear;
if (interpolationQuality > kO2InterpolationHigh) {
interpolationType = kImageInterpolationBicubic;
}
if (noInterpolation) {
interpolationType = kImageInterpolationNone;
}
/*
From David Duncan :
AlphaFirst => The Alpha channel is next to the Red channel
(ARGB and BGRA are both Alpha First formats)
AlphaLast => The Alpha channel is next to the Blue channel
(RGBA and ABGR are both Alpha Last formats)
LittleEndian => Blue comes before Red
(BGRA and ABGR are Little endian formats)
BigEndian => Red comes before Blue
(ARGB and RGBA are Big endian formats).
*/
switch (bitmapInfo & kO2BitmapByteOrderMask) {
// Big Endian is RB
case kO2BitmapByteOrder32Big:
switch (bitmapInfo & kO2BitmapAlphaInfoMask) {
case kO2ImageAlphaPremultipliedLast:
renderer->premultiplied = YES;
O2AGGContextDrawImage<o2agg::pixfmt_rgba32_pre>(self, imageBuffer, globalTransform, interpolationType);
break;
case kO2ImageAlphaLast:
renderer->premultiplied = NO;
O2AGGContextDrawImage<o2agg::pixfmt_rgba32>(self, imageBuffer, globalTransform, interpolationType);
break;
case kO2ImageAlphaPremultipliedFirst:
renderer->premultiplied = YES;
O2AGGContextDrawImage<o2agg::pixfmt_argb32_pre>(self, imageBuffer, globalTransform, interpolationType);
break;
case kO2ImageAlphaFirst:
renderer->premultiplied = NO;
O2AGGContextDrawImage<o2agg::pixfmt_argb32>(self, imageBuffer, globalTransform, interpolationType);
break;
default:
O2Log("UNKNOW ALPHA");
// Fallback to the default implementation - that means path clipping, shadow, layers... won't work well on this one
[super drawImage:image inRect:rect];
}
break;
// Little Endian is BG
case kO2BitmapByteOrderDefault:
case kO2BitmapByteOrder32Little:
switch (bitmapInfo & kO2BitmapAlphaInfoMask) {
case kO2ImageAlphaPremultipliedLast:
renderer->premultiplied = YES;
O2AGGContextDrawImage<o2agg::pixfmt_abgr32_pre>(self, imageBuffer, globalTransform, interpolationType);
break;
case kO2ImageAlphaLast:
renderer->premultiplied = NO;
O2AGGContextDrawImage<o2agg::pixfmt_abgr32>(self, imageBuffer, globalTransform, interpolationType);
break;
case kO2ImageAlphaPremultipliedFirst:
renderer->premultiplied = YES;
O2AGGContextDrawImage<o2agg::pixfmt_bgra32_pre>(self, imageBuffer, globalTransform, interpolationType);
break;
case kO2ImageAlphaFirst:
renderer->premultiplied = NO;
O2AGGContextDrawImage<o2agg::pixfmt_bgra32>(self, imageBuffer, globalTransform, interpolationType);
break;
default:
// Fallback to the default implementation - that means clipping, shadow, layers... won't work on this one
O2Log("UNKNOW ALPHA");
[super drawImage:image inRect:rect];
}
break;
default:
O2Log("UNKNOW ORDER");
// Fallback to the default implementation - that means path clipping, shadow, layers... won't work well on this one
[super drawImage:image inRect:rect];
break;
}
}
else
{
O2Log("Unsuported image format");
// Fallback to the default implementation - that means path clipping, shadow, layers... won't work well on this one
[super drawImage:image inRect:rect];
}
}
-(void)drawShading:(O2Shading *)shading
{
renderer->premultiplied = YES;
[self updateMask];
[self updateBlendMode];
rasterizer->reset();
rasterizer->clip_box(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
if ([shading isAxial]) {
O2AGGContextDrawShading<agg::gradient_x>(self, shading, _vpx, _vpy, _vpwidth, _vpheight);
} else {
// Note: we only support circle gradient for now where startPoint = endPoint
O2AGGContextDrawShading<agg::gradient_circle>(self, shading, _vpx, _vpy, _vpwidth, _vpheight);
}
}
-(void)beginTransparencyLayerWithInfo:(NSDictionary *)unused {
// NOTE: We could create a new context with only the current clipping size, and offset all clipping/drawing from the clipping origin
O2LayerRef layer=O2LayerCreateWithContext(self,[self size],unused);
[self->_layerStack addObject:layer];
O2LayerRelease(layer);
// Attach to the layer surface
O2Surface *surface = O2LayerGetSurface(layer);
renderingBuffer->attach((unsigned char *)O2SurfaceGetPixelBytes(surface),O2SurfaceGetWidth(surface),O2SurfaceGetHeight(surface),O2SurfaceGetBytesPerRow(surface));
O2ContextSaveGState(self); // Save the pre layer-time context
/**
* From Cocoa doc :
* graphics state parameters remain unchanged except for alpha (which is set to 1), shadow (which is turned off), blend mode (which is set to normal),
* and other parameters that affect the final composite.
*/
O2ContextResetClip(self); // Starts with a clean clipping region
O2GStateSetBlendMode(O2ContextCurrentGState(self), kO2BlendModeNormal);
O2GStateSetAlpha(O2ContextCurrentGState(self), 1.);
// No shadow from now
[O2ContextCurrentGState(self) setShadowOffset:O2SizeZero blur:0. color:nil];
}
-(void)endTransparencyLayer {
O2LayerRef layer=O2LayerRetain([self->_layerStack lastObject]);
[self->_layerStack removeLastObject];
O2Size size=[self size];
// Reattach the renderer to the top surface (either to the new top layer if any or the context one)
O2LayerRef newTopLayer = [self->_layerStack lastObject];
O2Surface *surface = newTopLayer?O2LayerGetSurface(newTopLayer):_surface;
renderingBuffer->attach((unsigned char *)O2SurfaceGetPixelBytes(surface),O2SurfaceGetWidth(surface),O2SurfaceGetHeight(surface),O2SurfaceGetBytesPerRow(surface));
O2ContextRestoreGState(self); // Restore the clean state
// Draw the layer content into our surface
O2ContextSaveGState(self);
// We want no transform here as the layer surface matches the context one
O2ContextConcatCTM(self, O2AffineTransformInvert(O2ContextGetCTM(self)));
[self drawImage:O2LayerGetSurface(layer) inRect:O2RectMake(0,0,size.width,size.height)];
O2ContextRestoreGState(self);
O2LayerRelease(layer);
}
#ifdef O2AGG_GLYPH_SUPPORT
-(void)showGlyphs:(const O2Glyph *)glyphs advances:(const O2Size *)advances count:(unsigned)count
{
// Use Win text rendering if the context shouldSmoothFonts isn't set (default value)
// Note that Win text rendering currently doesn't support some advanced features like
// non-rect clipping, shadows...
// There are also some issues when the context is scaled
// But rendering is faster
O2GState *gState=O2ContextCurrentGState(self);
if (gState->_shouldSmoothFonts == NO) {
[super showGlyphs:glyphs advances:advances count:count];
return;
}
renderer->premultiplied = YES;
[self updateMask];
[self updateBlendMode];
rasterizer->reset();
rasterizer->clip_box(self->_vpx,self->_vpy,self->_vpx+self->_vpwidth,self->_vpy+self->_vpheight);
O2AGGContextShowGlyphs(self,glyphs,advances,count);
}
#endif
#endif
@end
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