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optimized glReadPixels()

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This commit is contained in:
Brian Paul 2000-03-30 18:39:18 +00:00
parent e5d68a2b7d
commit 047fdf06cc
1 changed files with 121 additions and 2 deletions
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123
src/mesa/drivers/glide/fxdd.c
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@ -346,7 +346,7 @@ static GLboolean inClipRects(fxMesaContext fxMesa, int px, int py)
#endif
static GLboolean fxDDDrawBitMap(GLcontext *ctx, GLint px, GLint py,
static GLboolean fxDDDrawBitmap(GLcontext *ctx, GLint px, GLint py,
GLsizei width, GLsizei height,
const struct gl_pixelstore_attrib *unpack,
const GLubyte *bitmap)
@ -519,6 +519,124 @@ static GLboolean fxDDDrawBitMap(GLcontext *ctx, GLint px, GLint py,
return GL_TRUE;
}
static GLboolean fxDDReadPixels( GLcontext *ctx, GLint x, GLint y,
GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *packing,
GLvoid *dstImage )
{
if (ctx->Pixel.ScaleOrBiasRGBA || ctx->Pixel.MapColorFlag) {
return GL_FALSE; /* can't do this */
}
else {
fxMesaContext fxMesa=(fxMesaContext)ctx->DriverCtx;
GrLfbInfo_t info;
GLboolean result;
BEGIN_BOARD_LOCK();
if (grLfbLock(GR_LFB_READ_ONLY,
fxMesa->currentFB,
GR_LFBWRITEMODE_ANY,
GR_ORIGIN_UPPER_LEFT,
FXFALSE,
&info)) {
const GLint winX = fxMesa->x_offset;
const GLint winY = fxMesa->y_offset + fxMesa->height - 1;
const GLint srcStride = (fxMesa->glCtx->Color.DrawBuffer == GL_FRONT)
? (fxMesa->screen_width) : (info.strideInBytes / 2);
const GLushort *src = (const GLushort *) info.lfbPtr
+ (winY - y) * srcStride + (winX + x);
GLubyte *dst = (GLubyte *) _mesa_image_address(packing, dstImage,
width, height, format, type, 0, 0, 0);
GLint dstStride = _mesa_image_row_stride(packing, width, format, type);
if (format == GL_RGB && type == GL_UNSIGNED_BYTE) {
/* convert 5R6G5B into 8R8G8B */
GLint row, col;
const GLint halfWidth = width >> 1;
const GLint extraPixel = (width & 1);
for (row = 0; row < height; row++) {
GLubyte *d = dst;
for (col = 0; col < halfWidth; col++) {
const GLuint pixel = ((const GLuint *) src)[col];
const GLint pixel0 = pixel & 0xffff;
const GLint pixel1 = pixel >> 16;
*d++ = FX_PixelToR[pixel0];
*d++ = FX_PixelToG[pixel0];
*d++ = FX_PixelToB[pixel0];
*d++ = FX_PixelToR[pixel1];
*d++ = FX_PixelToG[pixel1];
*d++ = FX_PixelToB[pixel1];
}
if (extraPixel) {
GLushort pixel = src[width-1];
*d++ = FX_PixelToR[pixel];
*d++ = FX_PixelToG[pixel];
*d++ = FX_PixelToB[pixel];
}
dst += dstStride;
src -= srcStride;
}
result = GL_TRUE;
}
else if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
/* convert 5R6G5B into 8R8G8B8A */
GLint row, col;
const GLint halfWidth = width >> 1;
const GLint extraPixel = (width & 1);
for (row = 0; row < height; row++) {
GLubyte *d = dst;
for (col = 0; col < halfWidth; col++) {
const GLuint pixel = ((const GLuint *) src)[col];
const GLint pixel0 = pixel & 0xffff;
const GLint pixel1 = pixel >> 16;
*d++ = FX_PixelToR[pixel0];
*d++ = FX_PixelToG[pixel0];
*d++ = FX_PixelToB[pixel0];
*d++ = 255;
*d++ = FX_PixelToR[pixel1];
*d++ = FX_PixelToG[pixel1];
*d++ = FX_PixelToB[pixel1];
*d++ = 255;
}
if (extraPixel) {
const GLushort pixel = src[width-1];
*d++ = FX_PixelToR[pixel];
*d++ = FX_PixelToG[pixel];
*d++ = FX_PixelToB[pixel];
*d++ = 255;
}
dst += dstStride;
src -= srcStride;
}
result = GL_TRUE;
}
else if (format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5) {
/* directly memcpy 5R6G5B pixels into client's buffer */
const GLint widthInBytes = width * 2;
GLint row;
for (row = 0; row < height; row++) {
MEMCPY(dst, src, widthInBytes);
dst += dstStride;
src -= srcStride;
}
result = GL_TRUE;
}
else {
result = GL_FALSE;
}
grLfbUnlock(GR_LFB_READ_ONLY, fxMesa->currentFB);
}
END_BOARD_LOCK();
return result;
}
}
static void fxDDFinish(GLcontext *ctx)
{
FX_grFlush();
@ -981,8 +1099,9 @@ void fxSetupDDPointers(GLcontext *ctx)
ctx->Driver.SetReadBuffer=fxDDSetReadBuffer;
ctx->Driver.GetBufferSize=fxDDBufferSize;
ctx->Driver.Bitmap=fxDDDrawBitMap;
ctx->Driver.Bitmap=fxDDDrawBitmap;
ctx->Driver.DrawPixels=NULL;
ctx->Driver.ReadPixels=fxDDReadPixels;
ctx->Driver.Finish=fxDDFinish;
ctx->Driver.Flush=NULL;