|
|
@@ -1,590 +0,0 @@ |
|
|
|
// |
|
|
|
// Copyright (c) 2013 Mikko Mononen memon@inside.org |
|
|
|
// |
|
|
|
// This software is provided 'as-is', without any express or implied |
|
|
|
// warranty. In no event will the authors be held liable for any damages |
|
|
|
// arising from the use of this software. |
|
|
|
// Permission is granted to anyone to use this software for any purpose, |
|
|
|
// including commercial applications, and to alter it and redistribute it |
|
|
|
// freely, subject to the following restrictions: |
|
|
|
// 1. The origin of this software must not be misrepresented; you must not |
|
|
|
// claim that you wrote the original software. If you use this software |
|
|
|
// in a product, an acknowledgment in the product documentation would be |
|
|
|
// appreciated but is not required. |
|
|
|
// 2. Altered source versions must be plainly marked as such, and must not be |
|
|
|
// misrepresented as being the original software. |
|
|
|
// 3. This notice may not be removed or altered from any source distribution. |
|
|
|
// |
|
|
|
|
|
|
|
#ifndef NANOVG_H |
|
|
|
#define NANOVG_H |
|
|
|
|
|
|
|
#ifdef __cplusplus |
|
|
|
extern "C" { |
|
|
|
#endif |
|
|
|
|
|
|
|
#define NVG_PI 3.14159265358979323846264338327f |
|
|
|
|
|
|
|
struct NVGcontext; |
|
|
|
|
|
|
|
struct NVGcolor { |
|
|
|
union { |
|
|
|
float rgba[4]; |
|
|
|
struct { |
|
|
|
float r,g,b,a; |
|
|
|
}; |
|
|
|
}; |
|
|
|
}; |
|
|
|
|
|
|
|
struct NVGpaint { |
|
|
|
float xform[6]; |
|
|
|
float extent[2]; |
|
|
|
float radius; |
|
|
|
float feather; |
|
|
|
struct NVGcolor innerColor; |
|
|
|
struct NVGcolor outerColor; |
|
|
|
int image; |
|
|
|
int repeat; |
|
|
|
}; |
|
|
|
|
|
|
|
enum NVGwinding { |
|
|
|
NVG_CCW = 1, // Winding for solid shapes |
|
|
|
NVG_CW = 2, // Winding for holes |
|
|
|
}; |
|
|
|
|
|
|
|
enum NVGsolidity { |
|
|
|
NVG_SOLID = 1, // CCW |
|
|
|
NVG_HOLE = 2, // CW |
|
|
|
}; |
|
|
|
|
|
|
|
enum NVGlineCap { |
|
|
|
NVG_BUTT, |
|
|
|
NVG_ROUND, |
|
|
|
NVG_SQUARE, |
|
|
|
NVG_BEVEL, |
|
|
|
NVG_MITER, |
|
|
|
}; |
|
|
|
|
|
|
|
enum NVGpatternRepeat { |
|
|
|
NVG_REPEATX = 0x01, // Repeat image pattern in X direction |
|
|
|
NVG_REPEATY = 0x02, // Repeat image pattern in Y direction |
|
|
|
}; |
|
|
|
|
|
|
|
enum NVGalign { |
|
|
|
// Horizontal align |
|
|
|
NVG_ALIGN_LEFT = 1<<0, // Default, align text horizontally to left. |
|
|
|
NVG_ALIGN_CENTER = 1<<1, // Align text horizontally to center. |
|
|
|
NVG_ALIGN_RIGHT = 1<<2, // Align text horizontally to right. |
|
|
|
// Vertical align |
|
|
|
NVG_ALIGN_TOP = 1<<3, // Align text vertically to top. |
|
|
|
NVG_ALIGN_MIDDLE = 1<<4, // Align text vertically to middle. |
|
|
|
NVG_ALIGN_BOTTOM = 1<<5, // Align text vertically to bottom. |
|
|
|
NVG_ALIGN_BASELINE = 1<<6, // Default, align text vertically to baseline. |
|
|
|
}; |
|
|
|
|
|
|
|
enum NVGalpha { |
|
|
|
NVG_STRAIGHT_ALPHA, |
|
|
|
NVG_PREMULTIPLIED_ALPHA, |
|
|
|
}; |
|
|
|
|
|
|
|
struct NVGglyphPosition { |
|
|
|
const char* str; // Position of the glyph in the input string. |
|
|
|
float x; // The x-coordinate of the logical glyph position. |
|
|
|
float minx, maxx; // The bounds of the glyph shape. |
|
|
|
}; |
|
|
|
|
|
|
|
struct NVGtextRow { |
|
|
|
const char* start; // Pointer to the input text where the row starts. |
|
|
|
const char* end; // Pointer to the input text where the row ends (one past the last character). |
|
|
|
const char* next; // Pointer to the beginning of the next row. |
|
|
|
float width; // Logical width of the row. |
|
|
|
float minx, maxx; // Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending. |
|
|
|
}; |
|
|
|
|
|
|
|
|
|
|
|
// Begin drawing a new frame |
|
|
|
// Calls to nanovg drawing API should be wrapped in nvgBeginFrame() & nvgEndFrame() |
|
|
|
// nvgBeginFrame() defines the size of the window to render to in relation currently |
|
|
|
// set viewport (i.e. glViewport on GL backends). Device pixel ration allows to |
|
|
|
// control the rendering on Hi-DPI devices. |
|
|
|
// For example, GLFW returns two dimension for an opened window: window size and |
|
|
|
// frame buffer size. In that case you would set windowWidth/Height to the window size |
|
|
|
// devicePixelRatio to: frameBufferWidth / windowWidth. |
|
|
|
// AlphaBlend controls if drawing the shapes to the render target should be done using straight or |
|
|
|
// premultiplied alpha. If rendering directly to framebuffer you probably want to use NVG_STRAIGHT_ALPHA, |
|
|
|
// if rendering to texture which should contain transparent regions NVG_PREMULTIPLIED_ALPHA is the |
|
|
|
// right choice. |
|
|
|
void nvgBeginFrame(struct NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio, int alphaBlend); |
|
|
|
|
|
|
|
// Ends drawing flushing remaining render state. |
|
|
|
void nvgEndFrame(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// |
|
|
|
// Color utils |
|
|
|
// |
|
|
|
// Colors in NanoVG are stored as unsigned ints in ABGR format. |
|
|
|
|
|
|
|
// Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f). |
|
|
|
struct NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b); |
|
|
|
|
|
|
|
// Returns a color value from red, green, blue values. Alpha will be set to 1.0f. |
|
|
|
struct NVGcolor nvgRGBf(float r, float g, float b); |
|
|
|
|
|
|
|
|
|
|
|
// Returns a color value from red, green, blue and alpha values. |
|
|
|
struct NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a); |
|
|
|
|
|
|
|
// Returns a color value from red, green, blue and alpha values. |
|
|
|
struct NVGcolor nvgRGBAf(float r, float g, float b, float a); |
|
|
|
|
|
|
|
|
|
|
|
// Linearly interpoaltes from color c0 to c1, and returns resulting color value. |
|
|
|
struct NVGcolor nvgLerpRGBA(struct NVGcolor c0, struct NVGcolor c1, float u); |
|
|
|
|
|
|
|
// Sets transparency of a color value. |
|
|
|
struct NVGcolor nvgTransRGBA(struct NVGcolor c0, unsigned char a); |
|
|
|
|
|
|
|
// Sets transparency of a color value. |
|
|
|
struct NVGcolor nvgTransRGBAf(struct NVGcolor c0, float a); |
|
|
|
|
|
|
|
// Returns color value specified by hue, saturation and lightness. |
|
|
|
// HSL values are all in range [0..1], alpha will be set to 255. |
|
|
|
struct NVGcolor nvgHSL(float h, float s, float l); |
|
|
|
|
|
|
|
// Returns color value specified by hue, saturation and lightness and alpha. |
|
|
|
// HSL values are all in range [0..1], alpha in range [0..255] |
|
|
|
struct NVGcolor nvgHSLA(float h, float s, float l, unsigned char a); |
|
|
|
|
|
|
|
// |
|
|
|
// State Handling |
|
|
|
// |
|
|
|
// NanoVG contains state which represents how paths will be rendered. |
|
|
|
// The state contains transform, fill and stroke styles, text and font styles, |
|
|
|
// and scissor clipping. |
|
|
|
|
|
|
|
// Pushes and saves the current render state into a state stack. |
|
|
|
// A matching nvgRestore() must be used to restore the state. |
|
|
|
void nvgSave(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// Pops and restores current render state. |
|
|
|
void nvgRestore(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// Resets current render state to default values. Does not affect the render state stack. |
|
|
|
void nvgReset(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// |
|
|
|
// Render styles |
|
|
|
// |
|
|
|
// Fill and stroke render style can be either a solid color or a paint which is a gradient or a pattern. |
|
|
|
// Solid color is simply defined as a color value, different kinds of paints can be created |
|
|
|
// using nvgLinearGradient(), nvgBoxGradient(), nvgRadialGradient() and nvgImagePattern(). |
|
|
|
// |
|
|
|
// Current render style can be saved and restored using nvgSave() and nvgRestore(). |
|
|
|
|
|
|
|
// Sets current stroke style to a solid color. |
|
|
|
void nvgStrokeColor(struct NVGcontext* ctx, struct NVGcolor color); |
|
|
|
|
|
|
|
// Sets current stroke style to a paint, which can be a one of the gradients or a pattern. |
|
|
|
void nvgStrokePaint(struct NVGcontext* ctx, struct NVGpaint paint); |
|
|
|
|
|
|
|
// Sets current fill cstyle to a solid color. |
|
|
|
void nvgFillColor(struct NVGcontext* ctx, struct NVGcolor color); |
|
|
|
|
|
|
|
// Sets current fill style to a paint, which can be a one of the gradients or a pattern. |
|
|
|
void nvgFillPaint(struct NVGcontext* ctx, struct NVGpaint paint); |
|
|
|
|
|
|
|
// Sets the miter limit of the stroke style. |
|
|
|
// Miter limit controls when a sharp corner is beveled. |
|
|
|
void nvgMiterLimit(struct NVGcontext* ctx, float limit); |
|
|
|
|
|
|
|
// Sets the stroke witdth of the stroke style. |
|
|
|
void nvgStrokeWidth(struct NVGcontext* ctx, float size); |
|
|
|
|
|
|
|
// Sets how the end of the line (cap) is drawn, |
|
|
|
// Can be one of: NVG_BUTT (default), NVG_ROUND, NVG_SQUARE. |
|
|
|
void nvgLineCap(struct NVGcontext* ctx, int cap); |
|
|
|
|
|
|
|
// Sets how sharp path corners are drawn. |
|
|
|
// Can be one of NVG_MITER (default), NVG_ROUND, NVG_BEVEL. |
|
|
|
void nvgLineJoin(struct NVGcontext* ctx, int join); |
|
|
|
|
|
|
|
// |
|
|
|
// Transforms |
|
|
|
// |
|
|
|
// The paths, gradients, patterns and scissor region are transformed by an transformation |
|
|
|
// matrix at the time when they are passed to the API. |
|
|
|
// The current transformation matrix is a affine matrix: |
|
|
|
// [sx kx tx] |
|
|
|
// [ky sy ty] |
|
|
|
// [ 0 0 1] |
|
|
|
// Where: sx,sy define scaling, kx,ky skewing, and tx,ty translation. |
|
|
|
// The last row is assumed to be 0,0,1 and is not stored. |
|
|
|
// |
|
|
|
// Apart from nvgResetTransform(), each transformation function first creates |
|
|
|
// specific transformation matrix and pre-multiplies the current transformation by it. |
|
|
|
// |
|
|
|
// Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore(). |
|
|
|
|
|
|
|
// Resets current transform to a identity matrix. |
|
|
|
void nvgResetTransform(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// Premultiplies current coordinate system by specified matrix. |
|
|
|
// The parameters are interpreted as matrix as follows: |
|
|
|
// [a c e] |
|
|
|
// [b d f] |
|
|
|
// [0 0 1] |
|
|
|
void nvgTransform(struct NVGcontext* ctx, float a, float b, float c, float d, float e, float f); |
|
|
|
|
|
|
|
// Translates current coordinate system. |
|
|
|
void nvgTranslate(struct NVGcontext* ctx, float x, float y); |
|
|
|
|
|
|
|
// Rotates current coordinate system. Angle is specifid in radians. |
|
|
|
void nvgRotate(struct NVGcontext* ctx, float angle); |
|
|
|
|
|
|
|
// Skews the current coordinate system along X axis. Angle is specifid in radians. |
|
|
|
void nvgSkewX(struct NVGcontext* ctx, float angle); |
|
|
|
|
|
|
|
// Skews the current coordinate system along Y axis. Angle is specifid in radians. |
|
|
|
void nvgSkewY(struct NVGcontext* ctx, float angle); |
|
|
|
|
|
|
|
// Scales the current coordinat system. |
|
|
|
void nvgScale(struct NVGcontext* ctx, float x, float y); |
|
|
|
|
|
|
|
// Stores the top part (a-f) of the current transformation matrix in to the specified buffer. |
|
|
|
// [a c e] |
|
|
|
// [b d f] |
|
|
|
// [0 0 1] |
|
|
|
// There should be space for 6 floats in the return buffer for the values a-f. |
|
|
|
void nvgCurrentTransform(struct NVGcontext* ctx, float* xform); |
|
|
|
|
|
|
|
|
|
|
|
// The following functions can be used to make calculations on 2x3 transformation matrices. |
|
|
|
// A 2x3 matrix is representated as float[6]. |
|
|
|
|
|
|
|
// Sets the transform to identity matrix. |
|
|
|
void nvgTransformIdentity(float* dst); |
|
|
|
|
|
|
|
// Sets the transform to translation matrix matrix. |
|
|
|
void nvgTransformTranslate(float* dst, float tx, float ty); |
|
|
|
|
|
|
|
// Sets the transform to scale matrix. |
|
|
|
void nvgTransformScale(float* dst, float sx, float sy); |
|
|
|
|
|
|
|
// Sets the transform to rotate matrix. Angle is specifid in radians. |
|
|
|
void nvgTransformRotate(float* dst, float a); |
|
|
|
|
|
|
|
// Sets the transform to skew-x matrix. Angle is specifid in radians. |
|
|
|
void nvgTransformSkewX(float* dst, float a); |
|
|
|
|
|
|
|
// Sets the transform to skew-y matrix. Angle is specifid in radians. |
|
|
|
void nvgTransformSkewY(float* dst, float a); |
|
|
|
|
|
|
|
// Sets the transform to the result of multiplication of two transforms, of A = A*B. |
|
|
|
void nvgTransformMultiply(float* dst, const float* src); |
|
|
|
|
|
|
|
// Sets the transform to the result of multiplication of two transforms, of A = B*A. |
|
|
|
void nvgTransformPremultiply(float* dst, const float* src); |
|
|
|
|
|
|
|
// Sets the destination to inverse of specified transform. |
|
|
|
// Returns 1 if the inverse could be calculated, else 0. |
|
|
|
int nvgTransformInverse(float* dst, const float* src); |
|
|
|
|
|
|
|
// Transform a point by given transform. |
|
|
|
void nvgTransformPoint(float* dstx, float* dsty, const float* xform, float srcx, float srcy); |
|
|
|
|
|
|
|
// Converts degress to radians and vice versa. |
|
|
|
float nvgDegToRad(float deg); |
|
|
|
float nvgRadToDeg(float rad); |
|
|
|
|
|
|
|
// |
|
|
|
// Images |
|
|
|
// |
|
|
|
// NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering. |
|
|
|
// In addition you can upload your own image. The image loading is provided by stb_image. |
|
|
|
|
|
|
|
// Creates image by loading it from the disk from specified file name. |
|
|
|
// Returns handle to the image. |
|
|
|
int nvgCreateImage(struct NVGcontext* ctx, const char* filename); |
|
|
|
|
|
|
|
// Creates image by loading it from the specified chunk of memory. |
|
|
|
// Returns handle to the image. |
|
|
|
int nvgCreateImageMem(struct NVGcontext* ctx, unsigned char* data, int ndata); |
|
|
|
|
|
|
|
// Creates image from specified image data. |
|
|
|
// Returns handle to the image. |
|
|
|
int nvgCreateImageRGBA(struct NVGcontext* ctx, int w, int h, const unsigned char* data); |
|
|
|
|
|
|
|
// Updates image data specified by image handle. |
|
|
|
void nvgUpdateImage(struct NVGcontext* ctx, int image, const unsigned char* data); |
|
|
|
|
|
|
|
// Returns the domensions of a created image. |
|
|
|
void nvgImageSize(struct NVGcontext* ctx, int image, int* w, int* h); |
|
|
|
|
|
|
|
// Deletes created image. |
|
|
|
void nvgDeleteImage(struct NVGcontext* ctx, int image); |
|
|
|
|
|
|
|
// |
|
|
|
// Paints |
|
|
|
// |
|
|
|
// NanoVG supports four types of paints: linear gradient, box gradient, radial gradient and image pattern. |
|
|
|
// These can be used as paints for strokes and fills. |
|
|
|
|
|
|
|
// Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates |
|
|
|
// of the linear gradient, icol specifies the start color and ocol the end color. |
|
|
|
// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
|
|
|
struct NVGpaint nvgLinearGradient(struct NVGcontext* ctx, float sx, float sy, float ex, float ey, |
|
|
|
struct NVGcolor icol, struct NVGcolor ocol); |
|
|
|
|
|
|
|
// Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering |
|
|
|
// drop shadows or hilights for boxes. Parameters (x,y) define the top-left corner of the rectangle, |
|
|
|
// (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry |
|
|
|
// the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient. |
|
|
|
// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
|
|
|
struct NVGpaint nvgBoxGradient(struct NVGcontext* ctx, float x, float y, float w, float h, |
|
|
|
float r, float f, struct NVGcolor icol, struct NVGcolor ocol); |
|
|
|
|
|
|
|
// Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify |
|
|
|
// the inner and outer radius of the gradient, icol specifies the start color and ocol the end color. |
|
|
|
// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
|
|
|
struct NVGpaint nvgRadialGradient(struct NVGcontext* ctx, float cx, float cy, float inr, float outr, |
|
|
|
struct NVGcolor icol, struct NVGcolor ocol); |
|
|
|
|
|
|
|
// Creates and returns an image patter. Parameters (ox,oy) specify the left-top location of the image pattern, |
|
|
|
// (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render, |
|
|
|
// and repeat is combination of NVG_REPEATX and NVG_REPEATY which tells if the image should be repeated across x or y. |
|
|
|
// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint(). |
|
|
|
struct NVGpaint nvgImagePattern(struct NVGcontext* ctx, float ox, float oy, float ex, float ey, |
|
|
|
float angle, int image, int repeat); |
|
|
|
|
|
|
|
// |
|
|
|
// Scissoring |
|
|
|
// |
|
|
|
// Scissoring allows you to clip the rendering into a rectangle. This is useful for varius |
|
|
|
// user interface cases like rendering a text edit or a timeline. |
|
|
|
|
|
|
|
// Sets the current |
|
|
|
// The scissor rectangle is transformed by the current transform. |
|
|
|
void nvgScissor(struct NVGcontext* ctx, float x, float y, float w, float h); |
|
|
|
|
|
|
|
// Reset and disables scissoring. |
|
|
|
void nvgResetScissor(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// |
|
|
|
// Paths |
|
|
|
// |
|
|
|
// Drawing a new shape starts with nvgBeginPath(), it clears all the currently defined paths. |
|
|
|
// Then you define one or more paths and sub-paths which describe the shape. The are functions |
|
|
|
// to draw common shapes like rectangles and circles, and lower level step-by-step functions, |
|
|
|
// which allow to define a path curve by curve. |
|
|
|
// |
|
|
|
// NanoVG uses even-odd fill rule to draw the shapes. Solid shapes should have counter clockwise |
|
|
|
// winding and holes should have counter clockwise order. To specify winding of a path you can |
|
|
|
// call nvgPathWinding(). This is useful especially for the common shapes, which are drawn CCW. |
|
|
|
// |
|
|
|
// Finally you can fill the path using current fill style by calling nvgFill(), and stroke it |
|
|
|
// with current stroke style by calling nvgStroke(). |
|
|
|
// |
|
|
|
// The curve segments and sub-paths are transformed by the current transform. |
|
|
|
|
|
|
|
// Clears the current path and sub-paths. |
|
|
|
void nvgBeginPath(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// Starts new sub-path with specified point as first point. |
|
|
|
void nvgMoveTo(struct NVGcontext* ctx, float x, float y); |
|
|
|
|
|
|
|
// Adds line segment from the last point in the path to the specified point. |
|
|
|
void nvgLineTo(struct NVGcontext* ctx, float x, float y); |
|
|
|
|
|
|
|
// Adds bezier segment from last point in the path via two control points to the specified point. |
|
|
|
void nvgBezierTo(struct NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y); |
|
|
|
|
|
|
|
// Adds an arc segment at the corner defined by the last path point, and two specified points. |
|
|
|
void nvgArcTo(struct NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius); |
|
|
|
|
|
|
|
// Closes current sub-path with a line segment. |
|
|
|
void nvgClosePath(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// Sets the current sub-path winding, see NVGwinding and NVGsolidity. |
|
|
|
void nvgPathWinding(struct NVGcontext* ctx, int dir); |
|
|
|
|
|
|
|
// Creates new arc shaped sub-path. |
|
|
|
void nvgArc(struct NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir); |
|
|
|
|
|
|
|
// Creates new rectangle shaped sub-path. |
|
|
|
void nvgRect(struct NVGcontext* ctx, float x, float y, float w, float h); |
|
|
|
|
|
|
|
// Creates new rounded rectangle shaped sub-path. |
|
|
|
void nvgRoundedRect(struct NVGcontext* ctx, float x, float y, float w, float h, float r); |
|
|
|
|
|
|
|
// Creates new ellipse shaped sub-path. |
|
|
|
void nvgEllipse(struct NVGcontext* ctx, float cx, float cy, float rx, float ry); |
|
|
|
|
|
|
|
// Creates new circle shaped sub-path. |
|
|
|
void nvgCircle(struct NVGcontext* ctx, float cx, float cy, float r); |
|
|
|
|
|
|
|
// Fills the current path with current fill style. |
|
|
|
void nvgFill(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// Fills the current path with current stroke style. |
|
|
|
void nvgStroke(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
|
|
|
|
// |
|
|
|
// Text |
|
|
|
// |
|
|
|
// NanoVG allows you to load .ttf files and use the font to render text. |
|
|
|
// |
|
|
|
// The appearance of the text can be defined by setting the current text style |
|
|
|
// and by specifying the fill color. Common text and font settings such as |
|
|
|
// font size, letter spacing and text align are supported. Font blur allows you |
|
|
|
// to create simple text effects such as drop shadows. |
|
|
|
// |
|
|
|
// At render time the font face can be set based on the font handles or name. |
|
|
|
// |
|
|
|
// Font measure functions return values in local space, the calculations are |
|
|
|
// carried in the same resolution as the final rendering. This is done because |
|
|
|
// the text glyph positions are snapped to the nearest pixels sharp rendering. |
|
|
|
// |
|
|
|
// The local space means that values are not rotated or scale as per the current |
|
|
|
// transformation. For example if you set font size to 12, which would mean that |
|
|
|
// line height is 16, then regardless of the current scaling and rotation, the |
|
|
|
// returned line height is always 16. Some measures may vary because of the scaling |
|
|
|
// since aforementioned pixel snapping. |
|
|
|
// |
|
|
|
// While this may sound a little odd, the setup allows you to always render the |
|
|
|
// same way regardless of scaling. I.e. following works regardless of scaling: |
|
|
|
// |
|
|
|
// const char* txt = "Text me up."; |
|
|
|
// nvgTextBounds(vg, x,y, txt, NULL, bounds); |
|
|
|
// nvgBeginPath(vg); |
|
|
|
// nvgRoundedRect(vg, bounds[0],bounds[1], bounds[2]-bounds[0], bounds[3]-bounds[1]); |
|
|
|
// nvgFill(vg); |
|
|
|
// |
|
|
|
// Note: currently only solid color fill is supported for text. |
|
|
|
|
|
|
|
// Creates font by loading it from the disk from specified file name. |
|
|
|
// Returns handle to the font. |
|
|
|
int nvgCreateFont(struct NVGcontext* ctx, const char* name, const char* filename); |
|
|
|
|
|
|
|
// Creates image by loading it from the specified memory chunk. |
|
|
|
// Returns handle to the font. |
|
|
|
int nvgCreateFontMem(struct NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData); |
|
|
|
|
|
|
|
// Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found. |
|
|
|
int nvgFindFont(struct NVGcontext* ctx, const char* name); |
|
|
|
|
|
|
|
// Sets the font size of current text style. |
|
|
|
void nvgFontSize(struct NVGcontext* ctx, float size); |
|
|
|
|
|
|
|
// Sets the blur of current text style. |
|
|
|
void nvgFontBlur(struct NVGcontext* ctx, float blur); |
|
|
|
|
|
|
|
// Sets the letter spacing of current text style. |
|
|
|
void nvgTextLetterSpacing(struct NVGcontext* ctx, float spacing); |
|
|
|
|
|
|
|
// Sets the proportional line height of current text style. The line height is specified as multiple of font size. |
|
|
|
void nvgTextLineHeight(struct NVGcontext* ctx, float lineHeight); |
|
|
|
|
|
|
|
// Sets the text align of current text style, see NVGaling for options. |
|
|
|
void nvgTextAlign(struct NVGcontext* ctx, int align); |
|
|
|
|
|
|
|
// Sets the font face based on specified id of current text style. |
|
|
|
void nvgFontFaceId(struct NVGcontext* ctx, int font); |
|
|
|
|
|
|
|
// Sets the font face based on specified name of current text style. |
|
|
|
void nvgFontFace(struct NVGcontext* ctx, const char* font); |
|
|
|
|
|
|
|
// Draws text string at specified location. If end is specified only the sub-string up to the end is drawn. |
|
|
|
float nvgText(struct NVGcontext* ctx, float x, float y, const char* string, const char* end); |
|
|
|
|
|
|
|
// Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn. |
|
|
|
// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered. |
|
|
|
// Words longer than the max width are slit at nearest character (i.e. no hyphenation). |
|
|
|
void nvgTextBox(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end); |
|
|
|
|
|
|
|
// Measures the specified text string. Parameter bounds should be a pointer to float[4], |
|
|
|
// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax] |
|
|
|
// Returns the horizontal advance of the measured text (i.e. where the next character should drawn). |
|
|
|
// Measured values are returned in local coordinate space. |
|
|
|
float nvgTextBounds(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds); |
|
|
|
|
|
|
|
// Measures the specified multi-text string. Parameter bounds should be a pointer to float[4], |
|
|
|
// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax] |
|
|
|
// Measured values are returned in local coordinate space. |
|
|
|
void nvgTextBoxBounds(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds); |
|
|
|
|
|
|
|
// Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used. |
|
|
|
// Measured values are returned in local coordinate space. |
|
|
|
int nvgTextGlyphPositions(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, struct NVGglyphPosition* positions, int maxPositions); |
|
|
|
|
|
|
|
// Returns the vertical metrics based on the current text style. |
|
|
|
// Measured values are returned in local coordinate space. |
|
|
|
void nvgTextMetrics(struct NVGcontext* ctx, float* ascender, float* descender, float* lineh); |
|
|
|
|
|
|
|
// Breaks the specified text into lines. If end is specified only the sub-string will be used. |
|
|
|
// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered. |
|
|
|
// Words longer than the max width are slit at nearest character (i.e. no hyphenation). |
|
|
|
int nvgTextBreakLines(struct NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, struct NVGtextRow* rows, int maxRows); |
|
|
|
|
|
|
|
// |
|
|
|
// Internal Render API |
|
|
|
// |
|
|
|
enum NVGtexture { |
|
|
|
NVG_TEXTURE_ALPHA = 0x01, |
|
|
|
NVG_TEXTURE_RGBA = 0x02, |
|
|
|
}; |
|
|
|
|
|
|
|
struct NVGscissor |
|
|
|
{ |
|
|
|
float xform[6]; |
|
|
|
float extent[2]; |
|
|
|
}; |
|
|
|
|
|
|
|
struct NVGvertex { |
|
|
|
float x,y,u,v; |
|
|
|
}; |
|
|
|
|
|
|
|
struct NVGpath { |
|
|
|
int first; |
|
|
|
int count; |
|
|
|
unsigned char closed; |
|
|
|
int nbevel; |
|
|
|
struct NVGvertex* fill; |
|
|
|
int nfill; |
|
|
|
struct NVGvertex* stroke; |
|
|
|
int nstroke; |
|
|
|
int winding; |
|
|
|
int convex; |
|
|
|
}; |
|
|
|
|
|
|
|
struct NVGparams { |
|
|
|
void* userPtr; |
|
|
|
int atlasWidth, atlasHeight; |
|
|
|
int edgeAntiAlias; |
|
|
|
int (*renderCreate)(void* uptr); |
|
|
|
int (*renderCreateTexture)(void* uptr, int type, int w, int h, const unsigned char* data); |
|
|
|
int (*renderDeleteTexture)(void* uptr, int image); |
|
|
|
int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data); |
|
|
|
int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h); |
|
|
|
void (*renderViewport)(void* uptr, int width, int height, int alphaBlend); |
|
|
|
void (*renderFlush)(void* uptr, int alphaBlend); |
|
|
|
void (*renderFill)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe, const float* bounds, const struct NVGpath* paths, int npaths); |
|
|
|
void (*renderStroke)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe, float strokeWidth, const struct NVGpath* paths, int npaths); |
|
|
|
void (*renderTriangles)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, const struct NVGvertex* verts, int nverts); |
|
|
|
void (*renderDelete)(void* uptr); |
|
|
|
}; |
|
|
|
|
|
|
|
// Contructor and destructor, called by the render back-end. |
|
|
|
struct NVGcontext* nvgCreateInternal(struct NVGparams* params); |
|
|
|
void nvgDeleteInternal(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
// Debug function to dump cached path data. |
|
|
|
void nvgDebugDumpPathCache(struct NVGcontext* ctx); |
|
|
|
|
|
|
|
#define NVG_NOTUSED(v) do { (void)(1 ? (void)0 : ( (void)(v) ) ); } while(0) |
|
|
|
|
|
|
|
#ifdef __cplusplus |
|
|
|
} |
|
|
|
#endif |
|
|
|
|
|
|
|
#endif // NANOVG_H |