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|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef VECTOR_RENDERER_H
#define VECTOR_RENDERER_H
#include "common/scummsys.h"
#include "common/system.h"
#include "graphics/surface.h"
#include "graphics/colormasks.h"
#include "gui/InterfaceManager.h"
namespace Graphics {
class VectorRenderer;
struct DrawStep {
uint32 flags; /** Step flags, see DrawStepFlags */
struct {
uint8 r, g, b;
}
color1, /** Foreground color/gradient start */
color2; /** Background color/gradient end */
uint16 x, y, w, h, r; /** Shape size */
uint8 shadow, stroke, factor; /** Misc options... */
int fill_mode; /** active fill mode */
void (VectorRenderer::*drawing_call)(DrawStep*); /** Pointer to drawing function */
enum DrawStepFlags {
kStepCallbackOnly = (1 << 0),
kStepSettingsOnly = (1 << 1),
kStepSetBG = (1 << 2),
kStepSetFG = (1 << 3),
kStepSetGradient = (1 << 4),
kStepSetShadow = (1 << 5),
kStepSetGradientFactor = (1 << 6),
kStepSetStroke = (1 << 7),
kStepSetFillMode = (1 << 8)
};
};
VectorRenderer *createRenderer(int mode);
/**
* VectorRenderer: The core Vector Renderer Class
*
* This virtual class exposes the API with all the vectorial
* rendering functions that may be used to draw on a given Surface.
*
* This class must be instantiated as one of its children, which implement
* the actual rendering functionality for each Byte Depth / Byte Format
* combination, and may also contain platform specific code.
*
* TODO: Expand documentation.
*
* @see VectorRendererSpec
* @see VectorRendererAA
*/
class VectorRenderer {
public:
VectorRenderer() : _shadowOffset(0), _fillMode(kFillDisabled), _activeSurface(NULL), _strokeWidth(1), _gradientFactor(1) {}
virtual ~VectorRenderer() {}
/** Specifies the way in which a shape is filled */
enum FillMode {
kFillDisabled = 0,
kFillForeground = 1,
kFillBackground = 2,
kFillGradient = 3
};
enum TriangleOrientation {
kTriangleUp,
kTriangleDown,
kTriangleLeft,
kTriangleRight
};
/**
* Draws a line by considering the special cases for optimization.
*
* @param x1 Horizontal (X) coordinate for the line start
* @param x2 Horizontal (X) coordinate for the line end
* @param y1 Vertical (Y) coordinate for the line start
* @param y2 Vertical (Y) coordinate for the line end
*/
virtual void drawLine(int x1, int y1, int x2, int y2) = 0;
/**
* Draws a circle centered at (x,y) with radius r.
*
* @param x Horizontal (X) coordinate for the center of the circle
* @param y Vertical (Y) coordinate for the center of the circle
* @param r Radius of the circle.
*/
virtual void drawCircle(int x, int y, int r) = 0;
/**
* Draws a square starting at (x,y) with the given width and height.
*
* @param x Horizontal (X) coordinate for the center of the square
* @param y Vertical (Y) coordinate for the center of the square
* @param w Width of the square.
* @param h Height of the square
*/
virtual void drawSquare(int x, int y, int w, int h) = 0;
/**
* Draws a rounded square starting at (x,y) with the given width and height.
* The corners of the square are rounded with the given radius.
*
* @param x Horizontal (X) coordinate for the center of the square
* @param y Vertical (Y) coordinate for the center of the square
* @param w Width of the square.
* @param h Height of the square
* @param r Radius of the corners.
*/
virtual void drawRoundedSquare(int x, int y, int r, int w, int h) = 0;
virtual void drawTriangle(int x, int y, int base, int height, TriangleOrientation orient) = 0;
virtual void drawBeveledSquare(int x, int y, int w, int h, int bevel) = 0;
/**
* Gets the pixel pitch for the current drawing surface.
* Note: This is a real pixel-pitch, not a byte-pitch.
* That means it can be safely used in pointer arithmetics and
* in pixel manipulation.
*
* @return integer with the active bytes per pixel
*/
virtual uint16 surfacePitch() {
return _activeSurface->pitch / _activeSurface->bytesPerPixel;
}
/**
* Gets the BYTES (not bits) per Pixel we are working on,
* based on the active drawing surface.
*
* @return integer byte with the active bytes per pixel value
*/
virtual uint8 bytesPerPixel() {
return _activeSurface->bytesPerPixel;
}
/**
* Set the active foreground painting color for the renderer.
* All the foreground drawing from then on will be done with that color, unless
* specified otherwise.
*
* Foreground drawing means all outlines and basic shapes.
*
* @param r value of the red color byte
* @param g value of the green color byte
* @param b value of the blue color byte
*/
virtual void setFgColor(uint8 r, uint8 g, uint8 b) = 0;
/**
* Set the active background painting color for the renderer.
* All the background drawing from then on will be done with that color, unless
* specified otherwise.
*
* Background drawing means all the shape filling.
*
* @param r value of the red color byte
* @param g value of the green color byte
* @param b value of the blue color byte
*/
virtual void setBgColor(uint8 r, uint8 g, uint8 b) = 0;
/**
* Set the active gradient color. All shapes drawn using kFillGradient
* as their fill mode will use this VERTICAL gradient as their fill color.
*
* @param r1 value of the red color byte for the start color
* @param g1 value of the green color byte for the start color
* @param b1 value of the blue color byte for the start color
* @param r2 value of the red color byte for the end color
* @param g2 value of the green color byte for the end color
* @param b2 value of the blue color byte for the end color
*/
virtual void setGradientColors(uint8 r1, uint8 g1, uint8 b1, uint8 r2, uint8 g2, uint8 b2) = 0;
/**
* Sets the active drawing surface. All drawing from this
* point on will be done on that surface.
*
* @param surface Pointer to a Surface object.
*/
virtual void setSurface(Surface *surface) {
_activeSurface = surface;
}
/**
* Fills the active surface with the specified fg/bg color or the active gradient.
* Defaults to using the active Foreground color for filling.
*
* @param mode Fill mode (bg, fg or gradient) used to fill the surface
*/
virtual void fillSurface() = 0;
/**
* Clears the active surface.
*/
virtual void clearSurface() {
byte *src = (byte *)_activeSurface->pixels;
memset(src, 0, _activeSurface->w * _activeSurface->h * _activeSurface->bytesPerPixel);
}
/**
* Sets the active fill mode for all shapes.
*
* @see VectorRenderer::FillMode
* @param mode Specified fill mode.
*/
virtual void setFillMode(FillMode mode) {
_fillMode = mode;
}
/**
* Sets the stroke width. All shapes drawn with a stroke will
* have that width. Pass 0 to disable shape stroking.
*
* @param width Witdh of the stroke in pixels.
*/
virtual void setStrokeWidth(int width) {
_strokeWidth = width;
}
/**
* Enables adding shadows to all drawn primitives.
* Shadows are drawn automatically under the shapes. The given offset
* controls their intensity and size (the higher the offset, the
* bigger the shadows).
*
* @param offset Shadow offset.
* @see shadowDisable()
*/
virtual void shadowEnable(int offset) {
if (offset > 0)
_shadowOffset = offset;
}
/**
* Disables adding shadows to all drawn primitives.
*
* @see shadowEnable()
*/
virtual void shadowDisable() {
_shadowOffset = 0;
}
/**
* Sets the multiplication factor of the active gradient.
*
* @see _gradientFactor
* @param factor Multiplication factor.
*/
virtual void setGradientFactor(int factor) {
if (factor > 0)
_gradientFactor = factor;
}
void drawCallback_CIRCLE(DrawStep *step) {
drawCircle(step->x, step->y, step->r);
}
void drawCallback_SQUARE(DrawStep *step) {
drawSquare(step->x, step->y, step->w, step->h);
}
void drawCallback_LINE(DrawStep *step) {
drawLine(step->x, step->y, step->x + step->w, step->y + step->h);
}
void drawCallback_ROUNDSQ(DrawStep *step) {
drawRoundedSquare(step->x, step->y, step->r, step->w, step->h);
}
void drawCallback_FILLSURFACE(DrawStep *step) {
fillSurface();
}
virtual void drawStep(DrawStep *step);
virtual void copyFrame(OSystem *sys) = 0;
protected:
Surface *_activeSurface; /** Pointer to the surface currently being drawn */
FillMode _fillMode; /** Defines in which way (if any) are filled the drawn shapes */
int _shadowOffset; /** offset for drawn shadows */
int _strokeWidth; /** Width of the stroke of all drawn shapes */
int _gradientFactor; /** Multiplication factor of the active gradient */
int _gradientBytes[3]; /** Color bytes of the active gradient, used to speed up calculation */
};
/**
* VectorRendererSpec: Specialized Vector Renderer Class
*
* This templated class implements the basic subset of vector operations for
* all platforms by allowing the user to provide the actual Pixel Type and
* pixel information structs.
*
* This class takes two template parameters:
*
* @param PixelType Defines a type which may hold the color value of a single
* pixel, such as "byte" or "uint16" for 8 and 16 BPP respectively.
*
* @param PixelFormat Defines the type of the PixelFormat struct which contains all
* the actual information of the pixels being used, as declared in "graphics/colormasks.h"
*
* TODO: Expand documentation.
*
* @see VectorRenderer
*/
template<typename PixelType, typename PixelFormat>
class VectorRendererSpec : public VectorRenderer {
typedef VectorRenderer Base;
public:
/**
* @see VectorRenderer::drawLine()
*/
void drawLine(int x1, int y1, int x2, int y2);
/**
* @see VectorRenderer::drawCircle()
*/
void drawCircle(int x, int y, int r);
/**
* @see VectorRenderer::drawSquare()
*/
void drawSquare(int x, int y, int w, int h);
/**
* @see VectorRenderer::drawRoundedSquare()
*/
void drawRoundedSquare(int x, int y, int r, int w, int h);
/**
* @see VectorRenderer::drawTriangle()
*/
void drawTriangle(int x, int y, int base, int height, TriangleOrientation orient);
void drawBeveledSquare(int x, int y, int w, int h, int bevel) {
drawBevelSquareAlg(x, y, w, h, bevel, _fgColor, _bgColor);
}
/**
* @see VectorRenderer::setFgColor()
*/
void setFgColor(uint8 r, uint8 g, uint8 b) {
this->_fgColor = RGBToColor<PixelFormat>(r, g, b);
}
/**
* @see VectorRenderer::setBgColor()
*/
void setBgColor(uint8 r, uint8 g, uint8 b) {
this->_bgColor = RGBToColor<PixelFormat>(r, g, b);
}
/**
* @see VectorRenderer::setGradientColors()
*/
void setGradientColors(uint8 r1, uint8 g1, uint8 b1, uint8 r2, uint8 g2, uint8 b2) {
_gradientEnd = RGBToColor<PixelFormat>(r2, g2, b2);
_gradientStart = RGBToColor<PixelFormat>(r1, g1, b1);
Base::_gradientBytes[0] = (_gradientEnd & PixelFormat::kRedMask) - (_gradientStart & PixelFormat::kRedMask);
Base::_gradientBytes[1] = (_gradientEnd & PixelFormat::kGreenMask) - (_gradientStart & PixelFormat::kGreenMask);
Base::_gradientBytes[2] = (_gradientEnd & PixelFormat::kBlueMask) - (_gradientStart & PixelFormat::kBlueMask);
}
/**
* @see VectorRenderer::fillSurface()
*/
void fillSurface() {
PixelType *ptr = (PixelType *)_activeSurface->getBasePtr(0, 0);
int w = _activeSurface->w;
int h = _activeSurface->h ;
int pitch = surfacePitch();
if (Base::_fillMode == kFillBackground)
colorFill(ptr, ptr + w * h, _bgColor);
else if (Base::_fillMode == kFillForeground)
colorFill(ptr, ptr + w * h, _fgColor);
else if (Base::_fillMode == kFillGradient) {
int i = h;
while (i--) {
colorFill(ptr, ptr + w, calcGradient(h - i, h));
ptr += pitch;
}
}
}
virtual void copyFrame(OSystem *sys) {
#ifdef OVERLAY_MULTIPLE_DEPTHS
sys->copyRectToOverlay((const PixelType*)_activeSurface->getBasePtr(0, 0),
_activeSurface->w, 0, 0, _activeSurface->w, _activeSurface->w);
#else
sys->copyRectToOverlay((const OverlayColor*)_activeSurface->getBasePtr(0, 0),
_activeSurface->w, 0, 0, _activeSurface->w, _activeSurface->w);
#endif
sys->updateScreen();
}
protected:
/**
* Draws a single pixel on the surface with the given coordinates and
* the given color.
*
* @param x Horizontal coordinate of the pixel.
* @param y Vertical coordinate of the pixel.
* @param color Color of the pixel
*/
virtual inline void putPixel(int x, int y, PixelType color) {
PixelType *ptr = (PixelType *)_activeSurface->getBasePtr(x, y);
*ptr = color;
}
/**
* Blends a single pixel on the surface with the given coordinates, color
* and Alpha intensity.
*
* @param x Horizontal coordinate of the pixel.
* @param y Vertical coordinate of the pixel.
* @param color Color of the pixel
* @param alpha Alpha intensity of the pixel (0-255)
*/
virtual inline void blendPixel(int x, int y, PixelType color, uint8 alpha) {
if (alpha == 255)
putPixel(x, y, color);
else if (alpha > 0)
blendPixelPtr((PixelType*)Base::_activeSurface->getBasePtr(x, y), color, alpha);
}
/**
* Blends a single pixel on the surface in the given pixel pointer, using supplied color
* and Alpha intensity.
*
* This is implemented to prevent blendPixel() to calculate the surface pointer on each call.
* Optimized drawing algorithms should call this function when possible.
*
* @see blendPixel
* @param ptr Pointer to the pixel to blend on top of
* @param color Color of the pixel
* @param alpha Alpha intensity of the pixel (0-255)
*/
virtual inline void blendPixelPtr(PixelType *ptr, PixelType color, uint8 alpha) {
if (alpha == 255) {
*ptr = color;
return;
}
register int idst = *ptr;
register int isrc = color;
*ptr = (PixelType)(
(PixelFormat::kRedMask & ((idst & PixelFormat::kRedMask) +
((int)(((int)(isrc & PixelFormat::kRedMask) -
(int)(idst & PixelFormat::kRedMask)) * alpha) >> 8))) |
(PixelFormat::kGreenMask & ((idst & PixelFormat::kGreenMask) +
((int)(((int)(isrc & PixelFormat::kGreenMask) -
(int)(idst & PixelFormat::kGreenMask)) * alpha) >> 8))) |
(PixelFormat::kBlueMask & ((idst & PixelFormat::kBlueMask) +
((int)(((int)(isrc & PixelFormat::kBlueMask) -
(int)(idst & PixelFormat::kBlueMask)) * alpha) >> 8))) );
}
/**
* PRIMITIVE DRAWING ALGORITHMS
*
* Generic algorithms for drawing all kinds of aliased primitive shapes.
* These may be overloaded in inheriting classes to implement platform-specific
* optimizations or improve looks.
*
* @see VectorRendererAA
* @see VectorRendererAA::drawLineAlg
* @see VectorRendererAA::drawCircleAlg
*/
virtual void drawLineAlg(int x1, int y1, int x2, int y2, int dx, int dy, PixelType color);
virtual void drawCircleAlg(int x, int y, int r, PixelType color, FillMode fill_m);
virtual void drawRoundedSquareAlg(int x1, int y1, int r, int w, int h, PixelType color, FillMode fill_m);
virtual void drawSquareAlg(int x, int y, int w, int h, PixelType color, FillMode fill_m);
virtual void drawTriangleVertAlg(int x, int y, int w, int h, bool inverted, PixelType color, FillMode fill_m);
virtual void drawBevelSquareAlg(int x, int y, int w, int h, int bevel, PixelType top_color, PixelType bottom_color);
/**
* SHADOW DRAWING ALGORITHMS
*
* Optimized versions of the primitive drawing algorithms with alpha blending
* for shadow drawing.
* There functions may be overloaded in inheriting classes to improve performance
* in the slowest platforms where pixel alpha blending just doesn't cut it.
*
* @param blur Intensity/size of the shadow.
*/
virtual void drawSquareShadow(int x, int y, int w, int h, int blur);
virtual void drawRoundedSquareShadow(int x, int y, int r, int w, int h, int blur);
/**
* Calculates the color gradient on a given point.
* This function assumes that the gradient start/end colors have been set
* beforehand from the API function call.
*
* @param pos Progress of the gradient.
* @param max Maximum amount of the progress.
* @return Composite color of the gradient at the given "progress" amount.
*/
virtual inline PixelType calcGradient(uint32 pos, uint32 max) {
PixelType output = 0;
pos = (MIN(pos * Base::_gradientFactor, max) << 12) / max;
output |= (_gradientStart + ((Base::_gradientBytes[0] * pos) >> 12)) & PixelFormat::kRedMask;
output |= (_gradientStart + ((Base::_gradientBytes[1] * pos) >> 12)) & PixelFormat::kGreenMask;
output |= (_gradientStart + ((Base::_gradientBytes[2] * pos) >> 12)) & PixelFormat::kBlueMask;
output |= ~(PixelFormat::kRedMask | PixelFormat::kGreenMask | PixelFormat::kBlueMask);
return output;
}
/**
* Fills several pixels in a row with a given color and the specifed alpha blending.
*
* @see blendPixelPtr
* @see blendPixel
* @param first Pointer to the first pixel to fill.
* @param last Pointer to the last pixel to fill.
* @param color Color of the pixel
* @param alpha Alpha intensity of the pixel (0-255)
*/
virtual inline void blendFill(PixelType *first, PixelType *last, PixelType color, uint8 alpha) {
while (first != last)
blendPixelPtr(first++, color, alpha);
}
/**
* Fills several pixels in a row with a given color.
*
* This is a replacement function for Common::set_to, using an unrolled
* loop to maximize performance on most architectures.
* This function may (and should) be overloaded in any child renderers
* for portable platforms with platform-specific assembly code.
*
* This fill operation is extensively used throughout the renderer, so this
* counts as one of the main bottlenecks. Please replace it with assembly
* when possible!
*
* @param first Pointer to the first pixel to fill.
* @param last Pointer to the last pixel to fill.
* @param color Color of the pixel
*/
virtual inline void colorFill(PixelType *first, PixelType *last, PixelType color) {
if (first == last) {
*first = color;
return;
}
register PixelType *ptr = first;
register int count = (last - first);
register int n = (count + 7) >> 3;
switch (count % 8) {
case 0: do {
*ptr++ = color;
case 7: *ptr++ = color;
case 6: *ptr++ = color;
case 5: *ptr++ = color;
case 4: *ptr++ = color;
case 3: *ptr++ = color;
case 2: *ptr++ = color;
case 1: *ptr++ = color;
} while (--n > 0);
}
}
PixelType _fgColor; /** Foreground color currently being used to draw on the renderer */
PixelType _bgColor; /** Background color currently being used to draw on the renderer */
PixelType _gradientStart; /** Start color for the fill gradient */
PixelType _gradientEnd; /** End color for the fill gradient */
};
/**
* VectorRendererAA: Anti-Aliased Vector Renderer Class
*
* This templated class inherits all the functionality of the VectorRendererSpec
* class but uses better looking yet slightly slower AA algorithms for drawing
* most primivitves. May be used in faster platforms.
*
* TODO: Expand documentation.
*
* @see VectorRenderer
* @see VectorRendererSpec
*/
template<typename PixelType, typename PixelFormat>
class VectorRendererAA : public VectorRendererSpec<PixelType, PixelFormat> {
typedef VectorRendererSpec<PixelType, PixelFormat> Base;
protected:
/**
* "Wu's Line Antialiasing Algorithm" as published by Xiaolin Wu, July 1991
* Based on the implementation found in Michael Abrash's Graphics Programming Black Book.
*
* Generic line drawing algorithm for the Antialiased renderer. Optimized with no
* floating point operations, assumes no special cases.
*
* @see VectorRenderer::drawLineAlg()
*/
virtual void drawLineAlg(int x1, int y1, int x2, int y2, int dx, int dy, PixelType color);
/**
* "Wu's Circle Antialiasing Algorithm" as published by Xiaolin Wu, July 1991
* Based on the theoretical concept of the algorithm.
*
* Implementation of Wu's algorithm for circles using fixed point arithmetics.
* Could be quite fast.
*
* @see VectorRenderer::drawCircleAlg()
*/
virtual void drawCircleAlg(int x, int y, int r, PixelType color, VectorRenderer::FillMode fill_m);
/**
* "Wu's Circle Antialiasing Algorithm" as published by Xiaolin Wu, July 1991,
* modified with corner displacement to allow drawing of squares with rounded
* corners.
*
* @see VectorRenderer::drawRoundedAlg()
*/
virtual void drawRoundedSquareAlg(int x1, int y1, int r, int w, int h, PixelType color, VectorRenderer::FillMode fill_m);
};
} // end of namespace Graphics
#endif
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