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optimized glDrawPixels for glPixelZoom(1,-1) (Andrew Gee)

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This commit is contained in:
Brian Paul
2000-08-16 20:51:53 +00:00
parent e716184cae
commit b1097f24a8
1 changed files with 102 additions and 8 deletions
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110
src/mesa/main/drawpix.c
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@@ -1,4 +1,4 @@
/* $Id: drawpix.c,v 1.27 2000/08/16 17:32:42 brianp Exp $ */
/* $Id: drawpix.c,v 1.28 2000/08/16 20:51:53 brianp Exp $ */
/*
* Mesa 3-D graphics library
@@ -176,11 +176,35 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
zoomY0 = 0; /* not used - silence compiler warning */
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down image */
/* horizontal clipping */
if (destX < ctx->DrawBuffer->Xmin) {
skipPixels += (ctx->DrawBuffer->Xmin - destX);
drawWidth -= (ctx->DrawBuffer->Xmin - destX);
destX = ctx->DrawBuffer->Xmin;
}
if (destX + drawWidth > ctx->DrawBuffer->Xmax)
drawWidth -= (destX + drawWidth - ctx->DrawBuffer->Xmax - 1);
if (drawWidth <= 0)
return GL_TRUE;
/* vertical clipping */
if (destY > ctx->DrawBuffer->Ymax) {
skipRows += (destY - ctx->DrawBuffer->Ymax - 1);
drawHeight -= (destY - ctx->DrawBuffer->Ymax - 1);
destY = ctx->DrawBuffer->Ymax + 1;
}
if (destY - drawHeight < ctx->DrawBuffer->Ymin)
drawHeight -= (ctx->DrawBuffer->Ymin - (destY - drawHeight));
if (drawHeight <= 0)
return GL_TRUE;
}
else {
/* setup array of fragment Z value to pass to zoom function */
GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual->DepthMaxF);
GLint i;
assert(drawWidth < MAX_WIDTH);
ASSERT(drawWidth < MAX_WIDTH);
for (i=0; i<drawWidth; i++)
zSpan[i] = z;
@@ -211,6 +235,16 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
destY--;
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(void *) src, NULL);
src += rowLength * 4;
}
}
else {
/* with zooming */
GLint row;
@@ -237,6 +271,16 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
destY--;
(*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(void *) src, NULL);
src += rowLength * 3;
}
}
else {
/* with zooming */
GLint row;
@@ -257,7 +301,7 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
assert(drawWidth < MAX_WIDTH);
ASSERT(drawWidth < MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
@@ -271,10 +315,27 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
ASSERT(drawWidth < MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
rgb[i][0] = src[i];
rgb[i][1] = src[i];
rgb[i][2] = src[i];
}
destY--;
(*ctx->Driver.WriteRGBSpan)(ctx, drawWidth, destX, destY,
(void *) rgb, NULL);
src += rowLength;
}
}
else {
/* with zooming */
GLint row;
assert(drawWidth < MAX_WIDTH);
ASSERT(drawWidth < MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
for (i=0;i<drawWidth;i++) {
@@ -298,7 +359,7 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==1.0F) {
/* no zooming */
GLint row;
assert(drawWidth < MAX_WIDTH);
ASSERT(drawWidth < MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
GLubyte *ptr = src;
@@ -314,10 +375,29 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
destY++;
}
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
ASSERT(drawWidth < MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLint i;
GLubyte *ptr = src;
for (i=0;i<drawWidth;i++) {
rgba[i][0] = *ptr;
rgba[i][1] = *ptr;
rgba[i][2] = *ptr++;
rgba[i][3] = *ptr++;
}
destY--;
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(void *) rgba, NULL);
src += rowLength*2;
}
}
else {
/* with zooming */
GLint row;
assert(drawWidth < MAX_WIDTH);
ASSERT(drawWidth < MAX_WIDTH);
for (row=0; row<drawHeight; row++) {
GLubyte *ptr = src;
GLint i;
@@ -344,7 +424,7 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
/* no zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
assert(drawWidth < MAX_WIDTH);
ASSERT(drawWidth < MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(const GLubyte (*)[4])rgba,
@@ -354,11 +434,25 @@ simple_DrawPixels( GLcontext *ctx, GLint x, GLint y,
}
return GL_TRUE;
}
else if (ctx->Pixel.ZoomX==1.0F && ctx->Pixel.ZoomY==-1.0F) {
/* upside-down */
GLint row;
for (row=0; row<drawHeight; row++) {
ASSERT(drawWidth < MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
destY--;
(*ctx->Driver.WriteRGBASpan)(ctx, drawWidth, destX, destY,
(const GLubyte (*)[4])rgba,
NULL);
src += rowLength;
}
return GL_TRUE;
}
else {
/* with zooming */
GLint row;
for (row=0; row<drawHeight; row++) {
assert(drawWidth < MAX_WIDTH);
ASSERT(drawWidth < MAX_WIDTH);
_mesa_map_ci8_to_rgba(ctx, drawWidth, src, rgba);
gl_write_zoomed_rgba_span(ctx, drawWidth, destX, destY,
zSpan, (void *) rgba, zoomY0);