SDL_blendpoint.h File Reference

#include "../../SDL_internal.h"

Include dependency graph for SDL_blendpoint.h:

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Go to the source code of this file.

Functions
int	SDL_BlendPoint (SDL_Surface *dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
int	SDL_BlendPoints (SDL_Surface *dst, const SDL_Point *points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)

Function Documentation

SDL_BlendPoint()

int SDL_BlendPoint	(	SDL_Surface *	dst,
		int	x,
		int	y,
		SDL_BlendMode	blendMode,
		Uint8	r,
		Uint8	g,
		Uint8	b,
		Uint8	a
	)

Definition at line 217 of file SDL_blendpoint.c.

{
    if (!dst) {
        return SDL_SetError("Passed NULL destination surface");
    }
 
    /* This function doesn't work on surfaces < 8 bpp */
    if (dst->format->BitsPerPixel < 8) {
        return SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
    }
 
    /* Perform clipping */
    if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
        x >= (dst->clip_rect.x + dst->clip_rect.w) ||
        y >= (dst->clip_rect.y + dst->clip_rect.h)) {
        return 0;
    }
 
    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
        r = DRAW_MUL(r, a);
        g = DRAW_MUL(g, a);
        b = DRAW_MUL(b, a);
    }
 
    switch (dst->format->BitsPerPixel) {
    case 15:
        switch (dst->format->Rmask) {
        case 0x7C00:
            return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
        }
        break;
    case 16:
        switch (dst->format->Rmask) {
        case 0xF800:
            return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
        }
        break;
    case 32:
        switch (dst->format->Rmask) {
        case 0x00FF0000:
            if (!dst->format->Amask) {
                return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b, a);
            } else {
                return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b, a);
            }
            /* break; -Wunreachable-code-break */
        }
        break;
    default:
        break;
    }
 
    if (!dst->format->Amask) {
        return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
    } else {
        return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
    }
}

References blendMode, DRAW_MUL, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BlendPoint_ARGB8888(), SDL_BlendPoint_RGB(), SDL_BlendPoint_RGB555(), SDL_BlendPoint_RGB565(), SDL_BlendPoint_RGB888(), SDL_BlendPoint_RGBA(), and SDL_SetError.

Referenced by SDL_BlendLines().

SDL_BlendPoints()

int SDL_BlendPoints	(	SDL_Surface *	dst,
		const SDL_Point *	points,
		int	count,
		SDL_BlendMode	blendMode,
		Uint8	r,
		Uint8	g,
		Uint8	b,
		Uint8	a
	)

Definition at line 278 of file SDL_blendpoint.c.

{
    int minx, miny;
    int maxx, maxy;
    int i;
    int x, y;
    int (*func)(SDL_Surface * dst, int x, int y,
                SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
    int status = 0;
 
    if (!dst) {
        return SDL_SetError("Passed NULL destination surface");
    }
 
    /* This function doesn't work on surfaces < 8 bpp */
    if (dst->format->BitsPerPixel < 8) {
        return SDL_SetError("SDL_BlendPoints(): Unsupported surface format");
    }
 
    if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
        r = DRAW_MUL(r, a);
        g = DRAW_MUL(g, a);
        b = DRAW_MUL(b, a);
    }
 
    /* FIXME: Does this function pointer slow things down significantly? */
    switch (dst->format->BitsPerPixel) {
    case 15:
        switch (dst->format->Rmask) {
        case 0x7C00:
            func = SDL_BlendPoint_RGB555;
            break;
        }
        break;
    case 16:
        switch (dst->format->Rmask) {
        case 0xF800:
            func = SDL_BlendPoint_RGB565;
            break;
        }
        break;
    case 32:
        switch (dst->format->Rmask) {
        case 0x00FF0000:
            if (!dst->format->Amask) {
                func = SDL_BlendPoint_RGB888;
            } else {
                func = SDL_BlendPoint_ARGB8888;
            }
            break;
        }
        break;
    default:
        break;
    }
 
    if (!func) {
        if (!dst->format->Amask) {
            func = SDL_BlendPoint_RGB;
        } else {
            func = SDL_BlendPoint_RGBA;
        }
    }
 
    minx = dst->clip_rect.x;
    maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
    miny = dst->clip_rect.y;
    maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
 
    for (i = 0; i < count; ++i) {
        x = points[i].x;
        y = points[i].y;
 
        if (x < minx || x > maxx || y < miny || y > maxy) {
            continue;
        }
        status = func(dst, x, y, blendMode, r, g, b, a);
    }
    return status;
}

References blendMode, DRAW_MUL, i, int(), NULL, SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BlendPoint_ARGB8888(), SDL_BlendPoint_RGB(), SDL_BlendPoint_RGB555(), SDL_BlendPoint_RGB565(), SDL_BlendPoint_RGB888(), SDL_BlendPoint_RGBA(), and SDL_SetError.

Referenced by SW_RunCommandQueue().