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Di Jin(deleted)
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How to show a PNG image with transparent background
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Di Jin(deleted)
05/03/2013 4:47 AM
post101108
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How to show a PNG image with transparent background
I have a PNG image. I modify the background of image to transparency in the Photoshop. I write the code like this:
if (img.flags & IMG_TRANSPARENCY) {
/* we can handle transparency in GF using chroma */
gf_chroma_t chroma;
memset(&chroma, 0, sizeof chroma);
chroma.mode = GF_CHROMA_OP_SRC_MATCH | GF_CHROMA_OP_NO_DRAW;
if (img.format & IMG_FMT_PALETTE) {
chroma.color0 = img.palette[img.transparency.index];
} else if (IMG_FMT_BPP(img.format) < 24) {
chroma.color0 = img.transparency.rgb16;
} else {
chroma.color0 = img.transparency.rgb32;
}
gf_context_set_chroma(*p_context, &chroma);
}
if (img.format & IMG_FMT_ALPHA) {
gf_alpha_t alpha;
memset(&alpha, 0, sizeof alpha);
alpha.mode = GF_ALPHA_M1_SRC_PIXEL_ALPHA | GF_BLEND_SRC_M1 |
GF_BLEND_DST_1mM1;
gf_context_set_alpha(*p_context, &alpha);
}
// blit the image onto a target surface
gf_draw_blit2(*p_context, *p_surface, NULL, 0, 0, img.w - 1, img.h - 1, 0, 0);
I found (img.flags & IMG_TRANSPARENCY) this branch always nagative. But my Image has transparent background. How shold
I do?
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Derek Leach
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RE: How to show a PNG image with transparent background
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Derek Leach
05/03/2013 9:27 AM
post101114
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RE: How to show a PNG image with transparent background
What kind of PNG, 32-bit?
-----Original Message-----
From: Di Jin [mailto:community-noreply@qnx.com]
Sent: May-03-13 4:47 AM
To: advanced-graphics
Subject: How to show a PNG image with transparent background
I have a PNG image. I modify the background of image to transparency in the Photoshop. I write the code like this:
if (img.flags & IMG_TRANSPARENCY) {
/* we can handle transparency in GF using chroma */
gf_chroma_t chroma;
memset(&chroma, 0, sizeof chroma);
chroma.mode = GF_CHROMA_OP_SRC_MATCH | GF_CHROMA_OP_NO_DRAW;
if (img.format & IMG_FMT_PALETTE) {
chroma.color0 = img.palette[img.transparency.index];
} else if (IMG_FMT_BPP(img.format) < 24) {
chroma.color0 = img.transparency.rgb16;
} else {
chroma.color0 = img.transparency.rgb32;
}
gf_context_set_chroma(*p_context, &chroma);
}
if (img.format & IMG_FMT_ALPHA) {
gf_alpha_t alpha;
memset(&alpha, 0, sizeof alpha);
alpha.mode = GF_ALPHA_M1_SRC_PIXEL_ALPHA | GF_BLEND_SRC_M1 |
GF_BLEND_DST_1mM1;
gf_context_set_alpha(*p_context, &alpha);
}
// blit the image onto a target surface
gf_draw_blit2(*p_context, *p_surface, NULL, 0, 0, img.w - 1, img.h - 1, 0, 0);
I found (img.flags & IMG_TRANSPARENCY) this branch always nagative. But my Image has transparent background. How shold
I do?
_______________________________________________
Advanced Graphics
http://community.qnx.com/sf/go/post101108
To cancel your subscription to this discussion, please e-mail advanced-graphics-unsubscribe@community.qnx.com
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Di Jin(deleted)
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答复: How to show a PNG image with transparent background
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Di Jin(deleted)
05/03/2013 10:17 AM
post101119
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答复: How to show a PNG image with transparent background
Dear,Sir.
Please check the attaching file.
I generate it by Fireworks.
Thanks and Best Regards!
*******************************************
金狄
天元鼎正电子科技（北京）有限公司
北京市海淀区上地七街1号汇众大厦106
邮编：100085
电话：010-62970815
手机：18601122606
*******************************************
-----邮件原件-----
发件人: Derek Leach [mailto:community-noreply@qnx.com]
发送时间: 2013年5月3日 21:27
收件人: advanced-graphics
主题: RE: How to show a PNG image with transparent background
What kind of PNG, 32-bit?
-----Original Message-----
From: Di Jin [mailto:community-noreply@qnx.com]
Sent: May-03-13 4:47 AM
To: advanced-graphics
Subject: How to show a PNG image with transparent background
I have a PNG image. I modify the background of image to transparency in the
Photoshop. I write the code like this:
if (img.flags & IMG_TRANSPARENCY) {
/* we can handle transparency in GF using chroma */
gf_chroma_t chroma;
memset(&chroma, 0, sizeof chroma);
chroma.mode = GF_CHROMA_OP_SRC_MATCH | GF_CHROMA_OP_NO_DRAW;
if (img.format & IMG_FMT_PALETTE) {
chroma.color0 = img.palette[img.transparency.index];
} else if (IMG_FMT_BPP(img.format) < 24) {
chroma.color0 = img.transparency.rgb16;
} else {
chroma.color0 = img.transparency.rgb32;
}
gf_context_set_chroma(*p_context, &chroma);
}
if (img.format & IMG_FMT_ALPHA) {
gf_alpha_t alpha;
memset(&alpha, 0, sizeof alpha);
alpha.mode = GF_ALPHA_M1_SRC_PIXEL_ALPHA | GF_BLEND_SRC_M1 |
GF_BLEND_DST_1mM1;
gf_context_set_alpha(*p_context, &alpha);
}
// blit the image onto a target surface
gf_draw_blit2(*p_context, *p_surface, NULL, 0, 0, img.w - 1, img.h - 1,
0, 0);
I found (img.flags & IMG_TRANSPARENCY) this branch always nagative. But my
Image has transparent background. How shold I do?
_______________________________________________
Advanced Graphics
http://community.qnx.com/sf/go/post101108
To cancel your subscription to this discussion, please e-mail
advanced-graphics-unsubscribe@community.qnx.com
_______________________________________________
Advanced Graphics
http://community.qnx.com/sf/go/post101114
To cancel your subscription to this discussion, please e-mail
advanced-graphics-unsubscribe@community.qnx.com
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Di Jin(deleted)
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答复: How to show a PNG image with transparent background
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Di Jin(deleted)
05/05/2013 10:53 PM
post101156
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答复: How to show a PNG image with transparent background
Dear Sir.
I found my PNG file is a 32bit PNG, and then I change it to 8bit and 24bit,
but it still can not be transparented.
Thanks and Best Regards!
*******************************************
金狄
天元鼎正电子科技（北京）有限公司
北京市海淀区上地七街1号汇众大厦106
邮编：100085
电话：010-62970815
手机：18601122606
*******************************************
-----邮件原件-----
发件人: Derek Leach [mailto:community-noreply@qnx.com]
发送时间: 2013年5月3日 21:27
收件人: advanced-graphics
主题: RE: How to show a PNG image with transparent background
What kind of PNG, 32-bit?
-----Original Message-----
From: Di Jin [mailto:community-noreply@qnx.com]
Sent: May-03-13 4:47 AM
To: advanced-graphics
Subject: How to show a PNG image with transparent background
I have a PNG image. I modify the background of image to transparency in the
Photoshop. I write the code like this:
if (img.flags & IMG_TRANSPARENCY) {
/* we can handle transparency in GF using chroma */
gf_chroma_t chroma;
memset(&chroma, 0, sizeof chroma);
chroma.mode = GF_CHROMA_OP_SRC_MATCH | GF_CHROMA_OP_NO_DRAW;
if (img.format & IMG_FMT_PALETTE) {
chroma.color0 = img.palette[img.transparency.index];
} else if (IMG_FMT_BPP(img.format) < 24) {
chroma.color0 = img.transparency.rgb16;
} else {
chroma.color0 = img.transparency.rgb32;
}
gf_context_set_chroma(*p_context, &chroma);
}
if (img.format & IMG_FMT_ALPHA) {
gf_alpha_t alpha;
memset(&alpha, 0, sizeof alpha);
alpha.mode = GF_ALPHA_M1_SRC_PIXEL_ALPHA | GF_BLEND_SRC_M1 |
GF_BLEND_DST_1mM1;
gf_context_set_alpha(*p_context, &alpha);
}
// blit the image onto a target surface
gf_draw_blit2(*p_context, *p_surface, NULL, 0, 0, img.w - 1, img.h - 1,
0, 0);
I found (img.flags & IMG_TRANSPARENCY) this branch always nagative. But my
Image has transparent background. How shold I do?
_______________________________________________
Advanced Graphics
http://community.qnx.com/sf/go/post101108
To cancel your subscription to this discussion, please e-mail
advanced-graphics-unsubscribe@community.qnx.com
_______________________________________________
Advanced Graphics
http://community.qnx.com/sf/go/post101114
To cancel your subscription to this discussion, please e-mail
advanced-graphics-unsubscribe@community.qnx.com
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