// dvx_video.c — Layer 1: Video backend for DV/X GUI
//
// Platform-independent video utilities.  The actual VESA/VBE code
// now lives in dvxPlatformDos.c (or the platform file for whatever
// OS we're targeting).

#include "dvxVideo.h"
#include "platform/dvxPlatform.h"
#include "dvxPalette.h"

#include <string.h>


// ============================================================
// packColor
// ============================================================

uint32_t packColor(const DisplayT *d, uint8_t r, uint8_t g, uint8_t b) {
    if (d->format.bitsPerPixel == 8) {
        return dvxNearestPalEntry(d->palette, r, g, b);
    }

    uint32_t rv = ((uint32_t)r >> (8 - d->format.redBits))   << d->format.redShift;
    uint32_t gv = ((uint32_t)g >> (8 - d->format.greenBits)) << d->format.greenShift;
    uint32_t bv = ((uint32_t)b >> (8 - d->format.blueBits))  << d->format.blueShift;

    return rv | gv | bv;
}


// ============================================================
// resetClipRect
// ============================================================

void resetClipRect(DisplayT *d) {
    d->clipX = 0;
    d->clipY = 0;
    d->clipW = d->width;
    d->clipH = d->height;
}


// ============================================================
// setClipRect
// ============================================================

void setClipRect(DisplayT *d, int32_t x, int32_t y, int32_t w, int32_t h) {
    int32_t x2 = x + w;
    int32_t y2 = y + h;

    if (x  < 0)          { x  = 0; }
    if (y  < 0)          { y  = 0; }
    if (x2 > d->width)   { x2 = d->width; }
    if (y2 > d->height)  { y2 = d->height; }

    d->clipX = x;
    d->clipY = y;
    d->clipW = (x2 > x) ? x2 - x : 0;
    d->clipH = (y2 > y) ? y2 - y : 0;
}


// ============================================================
// videoInit
// ============================================================

int32_t videoInit(DisplayT *d, int32_t requestedW, int32_t requestedH, int32_t preferredBpp) {
    return platformVideoInit(d, requestedW, requestedH, preferredBpp);
}


// ============================================================
// videoShutdown
// ============================================================

void videoShutdown(DisplayT *d) {
    platformVideoShutdown(d);
}