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view test/nds-test-progs/sprite/source/common.h @ 3333:b334b4f7dfa0

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[SDL] Bad math in SDL_RenderCopy Mason Wheeler to sdl When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this: if (dstrect->w != real_dstrect.w) { int deltax = (dstrect->x - real_dstrect.x); int deltaw = (dstrect->w - real_dstrect.w); real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w; real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w; } if (dstrect->h != real_dstrect.h) { int deltay = (dstrect->y - real_dstrect.y); int deltah = (dstrect->h - real_dstrect.h); real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h; real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author Sam Lantinga <slouken@libsdl.org>
date Sat, 03 Oct 2009 16:23:16 +0000
parents 204be4fc2726
children
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/* A simple test program framework */

#include <SDL/SDL.h>

#define VERBOSE_VIDEO   0x00000001
#define VERBOSE_MODES   0x00000002
#define VERBOSE_RENDER  0x00000004
#define VERBOSE_EVENT   0x00000008
#define VERBOSE_AUDIO   0x00000010

typedef struct
{
    /* SDL init flags */
    char **argv;
    Uint32 flags;
    Uint32 verbose;

    /* Video info */
    const char *videodriver;
    int display;
    const char *window_title;
    Uint32 window_flags;
    int window_x;
    int window_y;
    int window_w;
    int window_h;
    int depth;
    int refresh_rate;
    int num_windows;
    SDL_WindowID *windows;

    /* Renderer info */
    const char *renderdriver;
    Uint32 render_flags;
    SDL_bool skip_renderer;

    /* Audio info */
    const char *audiodriver;
    SDL_AudioSpec audiospec;
} CommonState;

extern CommonState *CommonCreateState(char **argv, Uint32 flags);
extern int CommonArg(CommonState * state, int index);
extern const char *CommonUsage(CommonState * state);
extern SDL_bool CommonInit(CommonState * state);
extern void CommonEvent(CommonState * state, SDL_Event * event, int *done);
extern void CommonQuit(CommonState * state);