bool PicPxIsEdge(const Pic *pic, const Vec2i pos, const bool isPixel)
{
const bool isTopOrBottomEdge = pos.y == -1 || pos.y == pic->size.y;
const bool isLeftOrRightEdge = pos.x == -1 || pos.x == pic->size.x;
const bool isLeft =
pos.x > 0 && !isTopOrBottomEdge &&
PIXEL2COLOR(*(pic->Data + pos.x - 1 + pos.y * pic->size.x)).a;
const bool isRight =
pos.x < pic->size.x - 1 && !isTopOrBottomEdge &&
PIXEL2COLOR(*(pic->Data + pos.x + 1 + pos.y * pic->size.x)).a;
const bool isAbove =
pos.y > 0 && !isLeftOrRightEdge &&
PIXEL2COLOR(*(pic->Data + pos.x + (pos.y - 1) * pic->size.x)).a;
const bool isBelow =
pos.y < pic->size.y - 1 && !isLeftOrRightEdge &&
PIXEL2COLOR(*(pic->Data + pos.x + (pos.y + 1) * pic->size.x)).a;
if (isPixel)
{
return !(isLeft && isRight && isAbove && isBelow);
}
else
{
return isLeft || isRight || isAbove || isBelow;
}
}
void Draw_Point(const int x, const int y, color_t c)
{
Uint32 *screen = gGraphicsDevice.buf;
int idx = PixelIndex(
x,
y,
gGraphicsDevice.cachedConfig.Res.x,
gGraphicsDevice.cachedConfig.Res.y);
if (x < gGraphicsDevice.clipping.left ||
x > gGraphicsDevice.clipping.right ||
y < gGraphicsDevice.clipping.top ||
y > gGraphicsDevice.clipping.bottom)
{
return;
}
if (c.a == 255)
{
screen[idx] = COLOR2PIXEL(c);
}
else
{
const color_t existing = PIXEL2COLOR(screen[idx]);
screen[idx] = COLOR2PIXEL(ColorAlphaBlend(existing, c));
}
}
static void DrawGuideImage(
DrawBuffer *b, SDL_Surface *guideImage, Uint8 alpha)
{
SDL_LockSurface(guideImage);
// Scale based on ratio between map size and guide image size,
// so that the guide image stretches to the map size
double xScale = (double)guideImage->w / (gMap.Size.x * TILE_WIDTH);
double yScale = (double)guideImage->h / (gMap.Size.y * TILE_HEIGHT);
for (int j = 0; j < b->g->cachedConfig.Res.y; j++)
{
int y = (int)round((j + b->yTop) * yScale);
for (int i = 0; i < b->g->cachedConfig.Res.x; i++)
{
int x = (int)round((i + b->xTop) * xScale);
if (x >= 0 && x < guideImage->w && y >= 0 && y < guideImage->h)
{
int imgIndex = y * guideImage->w + x;
Uint32 p = ((Uint32 *)guideImage->pixels)[imgIndex];
color_t c = PIXEL2COLOR(p);
c.a = alpha;
Draw_Point(i, j, c);
}
}
}
SDL_UnlockSurface(guideImage);
}
void PicTrim(Pic *pic, const bool xTrim, const bool yTrim)
{
// Scan all pixels looking for the min/max of x and y
Vec2i min = pic->size;
Vec2i max = Vec2iZero();
for (Vec2i pos = Vec2iZero(); pos.y < pic->size.y; pos.y++)
{
for (pos.x = 0; pos.x < pic->size.x; pos.x++)
{
const Uint32 pixel = *(pic->Data + pos.x + pos.y * pic->size.x);
if (PIXEL2COLOR(pixel).a > 0)
{
min.x = MIN(min.x, pos.x);
min.y = MIN(min.y, pos.y);
max.x = MAX(max.x, pos.x);
max.y = MAX(max.y, pos.y);
}
}
}
// If no opaque pixels found, don't trim
Vec2i newSize = pic->size;
Vec2i offset = Vec2iZero();
if (min.x < max.x && min.y < max.y)
{
if (xTrim)
{
newSize.x = max.x - min.x + 1;
offset.x = min.x;
}
if (yTrim)
{
newSize.y = max.y - min.y + 1;
offset.y = min.y;
}
}
// Trim by copying pixels
Uint32 *newData;
CMALLOC(newData, newSize.x * newSize.y * sizeof *newData);
for (Vec2i pos = Vec2iZero(); pos.y < newSize.y; pos.y++)
{
for (pos.x = 0; pos.x < newSize.x; pos.x++)
{
Uint32 *target = newData + pos.x + pos.y * newSize.x;
const int srcIdx =
pos.x + offset.x + (pos.y + offset.y) * pic->size.x;
*target = *(pic->Data + srcIdx);
}
}
// Replace the old data
CFREE(pic->Data);
pic->Data = newData;
pic->size = newSize;
pic->offset = Vec2iZero();
}
void DrawPointTint(GraphicsDevice *device, Vec2i pos, HSV tint)
{
Uint32 *screen = device->buf;
int idx = PixelIndex(
pos.x, pos.y,
device->cachedConfig.Res.x,
device->cachedConfig.Res.y);
color_t c;
if (pos.x < device->clipping.left || pos.x > device->clipping.right ||
pos.y < device->clipping.top || pos.y > device->clipping.bottom)
{
return;
}
c = PIXEL2COLOR(screen[idx]);
c = ColorTint(c, tint);
screen[idx] = COLOR2PIXEL(c);
}
void DrawPointMask(GraphicsDevice *device, Vec2i pos, color_t mask)
{
Uint32 *screen = device->buf;
int idx = PixelIndex(
pos.x, pos.y,
device->cachedConfig.Res.x,
device->cachedConfig.Res.y);
color_t c;
if (pos.x < gGraphicsDevice.clipping.left ||
pos.x > gGraphicsDevice.clipping.right ||
pos.y < gGraphicsDevice.clipping.top ||
pos.y > gGraphicsDevice.clipping.bottom)
{
return;
}
c = PIXEL2COLOR(screen[idx]);
c = ColorMult(c, mask);
screen[idx] = COLOR2PIXEL(c);
}